Monday, July 31st

Auditorium 3

08:30 to 12:30

Plenary Session PLS-G-MON

08:30 to 09:00 - PLS-G-MON-01

Opening Ceremony and OMN 2024 First Announcement

Hugo Figueroa (General Chair); Dan Marom (OMN International Steering Committee Chair); Alexandre Pohl (SBFoton President and Organizing Committee Chair); Mônica Rocha (Technical Program Committee Chair); Andreas Seifert (OMN 2024 General Chair)

Chair: Dan Marom (Hebrew University, Israel)

09:00 to 09:45 – PLS-G-MON-02

“How does an idea of immersive display evolve into multiple innovations in personalized medicine?”

By Sunghoon Kwon (Seoul National University, South Korea)

I was interested in future immersive display systems when I was a doctoral student, and that’s why I was into optical MEMS. Due to the massive amount of data that needs to be processed in the display system, I thought it should be a self-assembled form of identical active display components that should organize itself as a display panel later. I proposed ‘smart scalable systems' as a research theme that could enable such a massive system in display, energy, and biochips based on self-assembly of many heterogeneous 5.components. Though the immersive display by self-assembly is still just an idea, this concept of smart scalable systems evolved into multiple biotech innovations for the past 15 years in my research group. I will present the concept of smart scalable systems first. Then I will talk about our researches in structural colored microparticles, DNA laser printer, life-saving antibiotic test, laser-based single-cell genomics, a few of which already become commercial products. It is even more interesting Iam applying again the technique I learned from these researches back to displays that use self-assembly. Life is a journey full of expectations and surprises.

09:45 to 10:00 – PLS-G-MON-03

“New synchrotron light sources and Sirius, the Brazilian player in this game”

By Antonio Jose Roque da Silva (CNEPM, Brazil)

The use of synchrotron radiation by a great variety of fields has increased steadily worldwide for the past decades. This, to a large extent, is a result of the availability of the much brighter third- generation light sources, which allowed the development of new experimental techniques. Recently, new advances in accelerator technology are opening up the possibility of even brighter sources, which are being named fourth-generation light sources. Brazil gave an important contribution to science in Latin America through the development of the necessary technology and the construction of its first synchrotron between 1987 and 1997. Even though it was a second- generation machine, it was fundamental to develop the know how to build and operate a synchrotron facility as well as a significant user community. Moreover, its pioneering activities in synchrotron science gave rise, with time, to the Brazilian Center for Research in Energy and Materials (CNPEM). CNPEM is a research center that combines the development and operation of open, multi-user, globally competitive laboratory infrastructures with integrated research and development in strategic areas, with focus on nanotechnology, biosciences, biotechnology, and bio- renewables, cutting-edge engineering, and scientific instrumentation. Among these facilities, Sirius, the new Brazilian synchrotron, stands out. It is a state-of-the-art light source, one of the first fourth-generation machines in the world. It provides cutting edge research tools that will benefit a wide range of areas, significantly increasing the capabilities of the Brazilian science.

10:30 to 11:00 - Coffee Break

Chair: Newton Frateschi (Unicamp, Brazil)

11:00 to 11:45 – PLS-G-MON-04

“Next generation silicon photonics”

By Michal Lipson (Columbia University, USA)

We are now experiencing a revolution in optical technologies: in the past the state of the art in the field of photonics transitioned from individual miniaturized optical devices to massive optical circuits on a microelectronic chip that can be modified on demand. This revolution is ongoing –new materials and technologies are emerging to control the flow of light in unprecedented ways and it is opening the door to applications that only a decade ago were unimaginable.

11:45 to 12:30 – PLS-G-MON-03

“Synchronization in Nonlinear Nanophotonics”

By Alexandre Gaeta (Columbia University, USA)

The phenomenon of synchronization occurs universally across the natural sciences and provides critical insight into the behaviour of coupled nonlinear dynamical systems. It also offers a powerful approach to robust frequency or temporal locking in diverse applications including communications, superconductors, and photonics. Here I describe several examples of synchronization between various types of nonlinear photonic oscillators including Kerr-comb generators and optical parametric oscillators.

12:30 to 14:00 – Lunch Break

Auditorium 1

14:00 to 15:15

Technical Session TS-MON-01 – Integrated Photonics and Optoelectronics 1

Chair: Thiago Alegre (Unicamp, Brazil)

14:00 to 14:30 - TS-MON-01-01

Invited: “Current Instabilities in Vacuum Electron Devices and Semiconductor Avalanche Diodes for Generation of THz Oscillations”

By Konstantin Alexandrovich Lukin and Alexsei Kuleshov (Institute for Radiophysics and Electronics, Ukraine)

Two promising methods for generation of THz radiation are presented and discussed. The hybrid bulk-surface modes excited in a cavity with bi-periodic grating have been considered. Such modes appear due to Electrodynamic interaction of the bulk modes with surface-wave resonator modes (i.e., leaky spoof surface plasmon polariton of an open grating). The potential for the effective generation of the THz radiation in a Clinotron by the excitation of the hybrid modes has been demonstrated. Theory of a new instability in reversed biased pn-junctions with impact ionization was developed and applied for investigation of THz oscillators design.

14:30 to 14:45 – TS-MON-01-02

“Dynamic control of coupled mode interactions in triple-state photonic molecules for four wave-mixing”

By Eduardo S. Gonçalves and Luca O. Trinchao (Unicamp, Brazil); Nathalia B Tomazio (USP, Brazil); Laís Fujii, Paulo Jarschel,  Thiago P. M. Alegre and Gustavo Wiederhecker (Unicamp, Brazil)

We present the dispersion engineering of the coupled modes of a triple-state photonic molecule via thermo-optic effects with integrated microheaters. Despite the overall normal group velocity dispersion, local regimes of normal and anomalous dispersion are tailored by fine-tuning the microcavities' supermodes frequencies, providing phase-matching conditions for four wave-mixing processes.

14:45 to 15:00 – TS-MON-01-03

“Managing Erbium emissions through ZnO host crystallinity”

By Camila Ianhez-Pereira, Ariano Rodrigues and Marcio Godoy (UFSCar, Brazil)

We report on the correlations between the optical emission of the Erbium and the structural conditions of ZnO host thin film. The influence of local chemical environment on the luminescence properties of the trivalent RE ions is often disregarded, and the management of host crystallinity in Spray-Pyrolysis synthesis is provided by the precursor dilution, i.e., solution molarity (M). Here we present an analysis of Erbium photoluminescence depending on the host crystallinity, which implies different Stark fields. The use of lower molarity results in transparent films well texturized in c-axis while the use of high molarity provides an opaque powder-like film.

15:00 to 15:15 – TS-MON-01-04

“Analysis of integrated photonics with Saturable absorption in the C-Band employing 2D 1T'-MoTe2 monolayer”

By Maria Carolina França Volpato, Pierre-Louis de Assis and Newton Cesário Frateschi (Unicamp, Brazil)

We investigate 1T'-MoTe2 as a saturable absorber for silicon photonics based integrated devices. Due to its semi-metallic and gap-less behavior, this material is ideal for saturable absorption. We present an optimization of the coupling coefficient between the waveguides to the 2D material, obtaining up to 17.5%. A simple carrier statistics calculation for this 2D structure is shown to be effective in providing good estimate of the saturation intensity for this material. Our simulation indicates that the saturation intensity for this material in an optimized waveguide is approximately 12 MW/cm^2 at 1550nm.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-MON-02 – MEMS 1

Chair: Niels Quack (University of Sydney, Australia)

16:00 to 16:30 - TS-MON-02-01

Invited:”2D broadband beam steering with MEMS optical phased array”

By Youmin Wang (Meta – Facebook, USA)

Optical-phased arrays (OPAs) enable complex beamforming, random-access beam pointing, and simultaneous scan and tracking of multiple targets by controlling the phases of two-dimensional (2D) coherent emitters. So far, no OPA can achieve all desirable features including large 2D arrays, high optical efficiency, wideband operation in wavelengths, fast response time, and large steering angles at the same time. Here, we report on a large-scale 2D OPA with novel microelectro-mechanical-system (MEMS)-actuated phase shifters. Wavelength-independent phase shifts are realized by physically moving a grating element in the lateral direction. The OPA has 160×160 independent phase shifters across an aperture of 3.1 mm×3.2  mm.

16:30 to 16:45 – TS-MON-02-02

“Exploiting Thermal Scanning Probe Lithography for the Fabrication of Micro and Nano Electronic Devices”

By Paloma Pellegrini (Unicamp, Brazil); Silvia Vaz Guerra Nista, Daniel de Lara, Mara Canesqui, Emilio Bortolucci and Stanislav Moshkalev (Center for Semiconductor Components and Nanotechnologies, Brazil)

By exploiting alternative fabrication processes, electronic and photonic devices can be shrunken and their performance, enhanced. In this work, we study the fabrication of micro and nano structures through thermal scanning probe lithography. With no vacuum requirements, a structure with a minimum dimension of 100nm was successfully built, in 17 minutes. Aiming at high performance electronic applications, the structure was coated with a 30nm gold film, and then electric characterized according to its foil resistivity.

16:45 to 17:00 – TS-MON-02-03

“Low-cost fabrication of an on-chip Fabry-Perot interferometer for dry environmental monitoring”

By Régis Guertin, Marc-Antoine Bianki and Yves-Alain Peter (Polytechnique Montréal, Canada)

A silicon (110) on-chip in-plane Fabry-Perot interferometer (FPI) with fiber grooves and polymer reservoirs is fabricated through a single anisotropic wet etching process, resulting in high verticality and low roughness. The FPI exhibits high finesse and Q factors and is functionalized with polymers to enable temperature and gas sensing.

17:00 to 17:15 – TS-MON-02-04

“Investigation of an inkjet printed optical resonator as an environmental sensor”

By Marc-Antoine Bianki, Régis Guertin, Cédric Lemieux-Leduc and Yves-Alain Peter (Polytechnique Montréal, Canada)

We investigated an inkjet-printed polymer optical resonator as an environmental sensor. The fabrication method combines additive manufacturing and microfabrication techniques to obtain a suspended SU-8 microdroplet on a silicon pillar. Sensitivity for temperature (-41.4 pm/°C) and humidity sensitivity (0.22 pm/ppm) are measured.

17:15 to 17:30 – TS-MON-02-05

“Theoretical and experimental study of comb-actuated mirror with cascaded structures”

By Wenhao Chen, Huahuang Luo, Mingzheng Duan and Hadi Tavakkoli (The Hong Kong Univ. of Science and Techn., Hong Kong); Wibool Piyawattanametha (KMITL and Chulalongkorn University, Thailand); Yi-Kuen Lee (Hong Kong Univ. of Science and Techn., Hong Kong)

For the first time, we present a two-dimensional theoretical model for one-dimensional comb-actuated MEMS mirror with cascaded structures. The numerical model including different damping mechanisms and nonlinear capacitive force is validated with experiment results. Stability analysis is conducted to simulate the nonlinear hysteretic frequency response. The model proposed can be a guideline for designing multi-degree-of-freedom nonlinear parametric-excited MEMS mirror with high frequency and large scan angle.

Auditorium 2

14:00 to 15:30

Technical Session TS-MON-03 – Biophotonics 1

Chair: Denise Zezell (IPEN/USP, Brazil)

14:00 to 14:30 - TS-MON-03-01

Invited: “Metallic Nanoparticles Functionalized with Aminolevulinic Acid and Gamma-Aminobutyric Acid: Applications in Medicine and Agriculture”

By Lilia Coronato Courrol (UNIFESP, Brazil

Aminolevulinic acid (ALA) as a prodrug can be converted to protoporphyrin IX, which can be accumulated preferentially in tumor cells, presenting theranostic applications. ALA is also a precursor to chlorophyll, essential for photosynthesis. Gamma-aminobutyric acid (GABA) is a vertebrate central nervous system neurotransmitter. In plants, intracellular levels of GABA are typically low. GABA can be significantly accumulated in response to drought, salt, and low temperature and can increase the resistance of plants against these stresses. This paper describes the synthesis and characterization of metallic nanoparticles (silver, gold, and copper) and their applications in medicine and agriculture.

14:30 to 14:45 – TS-MON-03-02

“Evaluation of silver nanoparticles synthesized with ALA and plant extract in seed nanopriming”

Isabela Lopes (UNIFESP, Brazil); Lilia Coronato Courrol (Instituto de Ciências Ambientais, Químicas e Farmaceuticas, Brazil & UNIFESP, Brazil)

Nanopriming is a simple and cost-effective method for seed germination and consists in using nanoparticles (NPs) in a solution for a determined period. In this paper, sunflower seeds were primed with water and silver NPs produced with aminolevulinic acid (ALA) and Mimusops Coriacea leaves extract, both synthesized by the photoreduction method. The fluorescence spectra and decay time of the chlorophyll extract of seedlings ten days after nanopriming were measured. The results indicated that silver NPs increased seed germination, seedling growth, and chlorophyll production compared to water-primed seeds. No toxicity was observed with the presence of silver NPs.

14:45 to 15:00 – TS-MON-03-03

“Sub-nanosecond microchip oscillator for a MOPA system tailored for tattoo removal”

By Marcus Vinicius Catarina, Allan Bereczki and Niklaus Wetter (IPEN, Brazil)

In this work we study a microchip laser designed to function as an oscillator in a Master-Oscillator Power-Amplifier (MOPA) system targeted for laser tattoo removal. Different configurations of the Nd: YAG resonator were used by changing the output coupler mirror reflectivities and the initial transmission of the Q-switch. The quasi-CW resonator provided 55.4 W of output with 51.31% and 78.2% optical and slope efficiencies, respectively. For Q-switched operation, the best configuration resulted in a peak output power of 3.6 MW with 588 ps pulse width.

15:00 to 15:15 – TS-MON-03-04

“Identification of basal cell carcinoma skin cancer using FTIR and Machine learning”

By Daniella L. Peres (IPEN & USP, Brazil); Sajid Farooq (IPEN, Brazil); Rocío Raffaeli (Universidad Nacional de La Plata, Argentina); Adele Croce (Universidad Nacional de La Plata, Brazil); Denise M. Zezell (IPEN/CNEN & USP, Brazil)

Here we applied ATR-FTIR spectroscopy combined with computational modeling based on 3D-discriminant analysis (3D-PCA-QDA). Our results present an exceptional performance of 3D-discriminant algorithms to diagnose BCC skin cancer, indicating the accuracy up to 97%.

15:15 to 15:30 – TS-MON-03-05

“Monitoring changes in urine from diabetic rats using ATR-FTIR and Machine learning”

By Sajid Farooq (IPEN, Brazil); Daniella L. Peres (IPEN & USP, Brazil); Douglas Caixeta (UFU, Brazil); Cássio Lima (University of Liverpool, UK); Robinson Sabino da Silva (UFU, Br); Denise M. Zezell (IPEN/CNEN & USP, Brazil)

Here, we aim to better characterize diabetes mellitus (DM) by analyzing 149 urine spectral samples, comprising of diabetes versus healthy control groups employing ATR-FTIR spectroscopy, combined with a 3D discriminant analysis machine learning approach. Our results depict that the model is highly precise with accuracy up to 100%.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-MON-04 – Lasers 1

Chair: Niklaus Wetter (IPEN, Brazil)

16:00 to 16:30 - TS-MON-04-01

Invited “Light-Sheets Composed of Bessel Beams for Three-Dimensional Holography and Imaging”

By Leonardo Ambrosio , Jhonas O. de Sarro and Vinicius de Angelis (USP, Brazil); Ahmed H Dorrah and Priyanuj Bordoloi (Harvard University, USA); Michel Zamboni-Rached (Unicamp, Brazil); Federico Capasso (Harvard University, USA)

We discuss theoretical aspects of longitudinallystructured light-sheets constructed from superpositions of Bessel beams, envisioning applications in holography, volumetric displays, augmented and virtual reality, optical trapping and manipulation of microparticles and so on. Current experimental setups are presented.

16:30 to 16:45 – TS-MON-04-02

“Photoelastic Dispersion Coefficient by Holographic Reconstruction with Neural Networks and the Fresnel Method”

By Felipe Maia Prado (USP, Brazil); Pedro Henrique Miho de Souza and Sidney Leal da Silva (Faculdade de Tecnologia de Itaquera, Brazil); Niklaus Wetter (IPEN, Brazil)

Here we report the characterization of the photoelastic dispersion coefficient using digital holography with two distinct reconstruction methods: one based on the Fresnel method and the other utilizing convolutional neural networks (CNN). The CNN was trained with reconstruction from the Fresnel method and was able to provide reconstructions with an average Mean Squared Error of 0.006.

16:45 to 17:00 – TS-MON-04-03

“Theoretical Analysis of Increasing Signal Beam Quality in a Pump-signal Beam Combiner by Adapting Mode Field Radius”

By Lucas Mendes (USP, Brazil); Ricardo E. Samad (IPEN/CNEN, Brazil); Claudio C. Motta (USP, Brazil)

High efficiency, low insertion loss and high beam quality are pump-signal beam combiners interesting characterıstics. These devices have enable to coupling power in the fiber lasers active medium and their performance has a strong impact at fiber lasers efficiency. So, in this paper the optical beam quality increase was analyzed by adapting the modal radius of the combiner signal fiber. The formulation is supported by the Finite Difference Beam Propagation Method (FD-BPM) and Fast Fourier Transforms (FFT), and they were implemented in Matlab.

17:00 to 17:15 – TS-MON-04-04

“Highly-efficient, dual-wavelength Nd: YLF laser emitting at 1314 nm and 1047nm”

By Felipe Maia Prado (USP,Brazil); Tomás Junqueira Franco (RWTH Aachen University Aachen, Germany & IPEN, Brazil); Niklaus Wetter (IPEN, Brazil)

We report a record optical-to-optical efficiency of 43% and a slope efficiency of 48% for a Nd: YLF laser emitting at 1314 nm. The crystal was side-pumped by a VBG-equipped diode emitting at 797 mn, with a peak power of 1545 W. We also report simultaneous dual-wavelength emission, at 1313 nm and 1047 nm.

17:15 to 17:30 – TS-MON-04-05

“Compact, high power CW ring laser resonator”

By Felipe Cremasco de Menezes (USP, Brazil); Allan Bereczki and Niklaus Wetter (IPEN, Brazil)

We demonstrated the dynamically stable operation of a Nd: YAG ring laser with 51.8 W of linearly polarized, continuous output power. The laser was based on laser modules side-pumped by diode bars. The resonator is aimed to single-frequency operation and it is a design improvement from a previous work with the resonator length 4.3 times smaller than the previous design, thus resulting in a larger free spectral range favoring for operation at single-frequency.

Auditorium 3

14:00 to 15:30

Technical Session TS-MON-05 – Sensors, Image and Illumination 1

Chair: Renato Evangelista de Araújo (UFPE, Brazil)

14:00 to 14:30 - TS-MON-05-01

Invited: “Waveguide-Based Designs and Optimization of Solar Thermal Collectors for Building Integration”

By Diego Rativa (UPE, Brazil)

Solar energy is becoming increasingly important as a clean and renewable energy source. One type of collector, the Direct Absorption Solar Collector (DASC), is a cost-effective and simple design without the need for solar tracker elements. The use of nanoparticles in the DASC has improved its performance, but challenges remain, such as high costs and handling issues. In this presentation, we propose new designs for the DASC and Concentrating Solar Thermal collectors based on waveguide mechanism, aiming to integrate them with building structures. These designs use advanced algorithms to optimize performance and reduce costs. We prototype the designs using Transparent/Clear 3D Printing and validate their efficiency under controlled illumination conditions.

14:30 to 14:45 – TS-MON-05-02

“Large-core hollow fibers for speckle-based displacement sensing”

By Jonas H Osório, Thiago D Cabral and Eric Fujiwara (Unicamp, Br); Marcos A. R. Franco (IEAv/CTA, Br); Foued Amrani (University of Limoges, France); Frédéric Delahaye (Glophotonics, Brazil); Frédéric Gérôme and Fetah Benabid (Univ. of Limoges, France); Cristiano MB Cordeiro (Unicamp, Brazil)

We study the application of a large-core hollow fiber as a platform for displacement sensing. The sensor is assembled by inserting and appropriately moving a single-mode fiber in the empty core of the hollow fiber. Such a construction allows attaining a speckled intensity profile at the hollow fiber output, which is evaluated while one controllably displaces the single-mode fiber in its interior. Our results allow identifying this scheme as a promising means for exploring the multimode characteristics of hollow fibers in sensing contexts.

14:45 to 15:00 – TS-MON-05-03

“Temperature sensing with a liquid-filled hollow-core photonic crystal fiber”

By Gabriel Labes Rodrigues and Cristiano MB Cordeiro (Unicamp, Brazil); Foued Amrani, Frédéric Gérôme and Fetah Benabid (University of Limoges, France); Jonas H Osório (Unicamp, Brazil)

We report the realization of temperature sensing measurements using a water-filled hollow-core photonic crystal fiber. The operation of the sensor relies on the thermo-optic effect-mediated spectral shifts of the fiber transmission bands due to temperature variations. The characterization of our device allowed us to estimate a sensitivity of (0.42 ± 0.04) nm/ºC and to identify the studied platform as a valid path for the development of fiber-based temperature sensors.

15:00 to 15:15 – TS-MON-05-04

“Post-processing of hollow-core photonic crystal fibers: selective hole inflation and tapering”

By Guilherme Machado and Cristiano MB Cordeiro (Unicamp, Brazil); Rodrigo Gerosa (Universidade Presbiteriana Mackenzie, Brazil); Foued Amrani, Frédéric Gérôme and Fetah Benabid (University of Limoges, France); Jonas Hosório (Unicamp, Brazil)

We report on post-processing experiments using hollow-core photonic crystal fibers. We show that, by simultaneously heating and internally pressurizing the fibers, we can taper or modify the sizes of the fiber microstructure features. Particularly, by employing a technique for selectively obstructing the microstructure elements, we could attain tailored modifications of the fiber architecture, namely the inflation of selected cladding tubes, which can be of interest for the development of new devices and sensors.

15:15 to 15:30 – TS-MON-05-05

“Refractive Index Sensor based on Hetero-core fiber Interrogated by a Laser/photodetector at 1550 nm”

By Hebio Oliveira, Thales H. Castro de Barros, Allamys Allan Dias da Silva, Jehan Nascimento and Joaquim F. Martins-Filho (UFPE, Brazil)

We present an investigation of a hetero-core fiber optic refractive index sensor that performs measurements under the 1550 nm wavelength for chemical and biological applications. The structure is formed by a no-core fiber (NCF) spliced to a multimode optical fiber at each of its ends, forming a Multimode / No-core fiber / Multimode (MNM) structure, where the NCF fiber is the sensing part of the structure. The simple and low cost interrogation scheme uses a laser and a photodetector. The sensor is able to measure refractive index variations with a resolution of 9.93×10-5 RIU.

15:30 to 16:00 - Coffee Break

16:00 to 17:15

Technical Session TS-MON-06 – Optics and Instrumentation 1

Chair: Jonas Henrique Osório (Unicamp, Brazil) (to be confirmed)

16:00 to 16:30 - TS-MON-06-01

Invited “Upconversion nanoparticles and IR-activated processes”

By Sidney José L. Ribeiro (Unesp, Brazil)

This presentation will focus on upconversion nanoparticles (UCNPs) which are suitable materials for bioapplications due to their ability to emit visible light under near infrared (NIR) excitation, in the biological transparency range.

16:30 to 16:45 – TS-MON-06-02

“A study of the properties of Iron oxides (alpha-Fe2O3 and Fe3O4) through time domain spectroscopy in the Terahertz range”

By Giovanni Budroni, Nt (Unicamp, Brazil)

Time domain spectroscopy was performed on samples of the iron oxides alpha-hematite and magnetite. From their spectra, we were able to obtain the complex refractive index, optical conductivity and dielectric constants. For alpha-hematite, an AFM resonance was detected in 0.13 THz. Although we did not find any resonance for magnetite, it was possible to observe spectral changes by decreasing the temperature. This show to us that TDS-THz is an attractive tool to detect corrosion on iron materials.

16:45 to 17:00 – TS-MON-06-03

“Interactions between plasmonic nanoparticles with a Kretschmann-configuration SPR setup”

By Ricardo Araguillin (Escuela Politécnica Nacional, Ecuador); Elizabeth Samaniego (Universidad de Buenos Aires, Argentina); Isamar Sarabia and Víctor Santos (Escuela Politécnica Nacional, Ecuador); Xavier Cattöen (Universitè Grenoble Alpes, France); Yanxia Hou (Université Grenoble Alpes, CNRS, CEA, IRIG SyMMES, France); César Costa-Vera (Escuela Politécnica Nacional, Ecuador)

We studied by Surface Plasmon Resonance (Kretschmann configuration) interactions in nanoparticles suspended in liquids and between the NPs and the sensor gold surface. After calibration with NaCl, suspensions were dried to measure the continuously reconcentrating NP suspensions.

17:00 to 17:15 – TS-MON-06-04

“Characterizing an inhomogeneous water-carbohydrate solution using its optical activity”

By Eduardo A. V. Souza, Jonas H Osório and Cristiano MB Cordeiro (Unicamp, Brazil)

We report on the characterization of the depth-dependent concentration gradient of an inhomogeneous water-sucrose solution and its evolution with time. The experimental method is simple and non-intrusive, being attractive for the characterization of liquid samples displaying optical activity.

UNICAMP Lake House

18:30 to 20:30

Music Concert

Unicamp’s Choir "Zíper na Boca"

Formed in September 1985, the group is made up of undergraduate and graduate students, employees and professors from different areas of Unicamp and people from the external community. Linked to the Center for Integration, Documentation and Cultural Diffusion (CIDDIC) since 1990, it actively participates in national and international choir festivals

Tuesday, August 1st

Auditorium 3

09:00 to 12:30

Plenary Session PLS-G-TUE

Chair: Hugo Figueroa (Unicamp, Brazil)

09:00 to 09:45 – PLS-G-TUE-01

“Enhancement in LiDAR SNR using non-Classical Light”

By Amr Helmy (University of Toronto, Canada)

Sensing modalities and instrumentation for target detection and raging applications have received tremendous attention over the past decade. This has been driven in no small part by the unsatiable demand for cheaper, more compact and significantly improved Light Detection and Ranging (LiDAR), which is essential for autonomous navigation. The detection of objects in the presence of significant background noise is a problem of fundamental interest in sensing. In this talk I aim to demonstrate theoretically and experimentally how one can exploit non-classical light generated in monolithic semiconductor light sources in conjunction with non-local effects to enhance the performance of optical target detection and model LiDAR system. Our protocols utilize quantum time-correlation which are obtained from a spontaneous parametric down-conversion sources. The protocols only require time-resolved photon-counting detection, which is phase-insensitive and therefore suitable for practical target detection. As a representative comparison to such a detection protocol, we also consider a classical phase-insensitive target detection protocol based on intensity detection. Unlike classical target detection and ranging protocols, the probe photons in our detection protocol are completely indistinguishable from the background noise and therefore useful for covert ranging applications. The experimental results agree very well with the theoretical prediction. In particular, we find that in a high-level environment noise and loss, our detection protocol can achieve performance comparable to that of the classical protocol that is practical in the optical regime.

09:45 to 10:00 – PLS-G-TUE-02

“Amorphous oxides by design for photonics applications”

By Carmem Menoni (University of State Colorado, USA)

Amorphous oxides are prevalent in photonic technologies. They are transparent from the near ultraviolet to the midinfrared and offer a large refractive index contrast with substrates like Si which is exploited to confine light. In this talk I will describe how the optical and structural properties of amorphous oxide thin films deposited by sputtering are tailored to engineer multilayer dielectric stacks with selected optical response for their applications to laser science and photonics

10:30 to 11:00 - Coffee Break

Chair: Abdreas Seifert (NanoGune, Spain)

11:00 to 11:45 – PLS-G-TUE-03

“Flat optics: arbitrary wavefront control with passive and active metasurfaces and metalenses for high volume applications”

By Federico Capasso* (Harvard University, USA)
(*remote from USA)

I will discuss metasurfaces that enable light’s spin and orbital angular momentum to evolve along the propagation direction and nonlocal supercell designs that demonstrate multiple independent optical functions at arbitrary large deflection angles with high efficiency. 2D phase and polarization singularities (“structured dark”) have been realized, as well as 0D singularities. I will give the state-of-the-art of metalenses including their high-volume manufacturing for consumer electronics.

11:45 to 12:30 – PLS-G-TUE-04

“Diffractive Optical Networks & Computational Imaging Without a Computer”

By Aydogan Ozcan* (UCLA,USA)
(*remote from USA)

I will discuss diffractive optical networks designed by deep learning to all-optically implement various complex functions as the input light diffracts through spatially-engineered surfaces. These diffractive processors designed by deep learning have various applications, e.g., all-optical image analysis, feature detection, object classification, computational imaging and seeing through diffusers, also enabling task-specific camera designs and new optical components for spatial, spectral and temporal beam shaping and spatially-controlled wavelength division multiplexing.

12:30 to 14:00 – Lunch Break

Auditorium 1

14:00 to 15:30

Technical Session TS-TUE-01 – Photonics 1

Chair: Gilliard Nardel Silveira (Unicamp, Brazil)

14:00 to 14:30 - TS-TUE-01-01

Invited: “Designs and Optimisation of Photonic Devices by Finite Element Method”

By Azizur Rahman (City University of London, UK)

A review on the characterisations of photonics devices by using numerically efficient finite element method is presented.

14:30 to 14:45 – TS-TUE-01-02

“Mixing Neural Networks and Genetic Algorithms for Optimized LSPR Biosensor Design”

By Felipe Aragão Nogueira De Freitas, Omar Neto (UFMG, Brazil) and Jhonattan Cordoba Ramirez (UFMG, Brazil)

Localized Surface Plasmon Resonance devices have garnered attention and demonstrated noteworthy promise in response to the growing demand for more precise and effective tools in the medical field. However, LSPR devices require optimized geometry to deliver high accuracy, which poses an inherent challenge for their use. In this paper, we present a novel methodology embedded in an in-use intelligent tool that uses a Genetic Algorithm and Neural Network for modeling and data processing in LSPR devices for biosensing applications.

14:45 to 15:00 – TS-TUE-01-03

“Optical Fiber Specklegram Bending Sensor for Application in Soft Robotics”

By Matheus Rodrigues (Unicamp & Embraer, Brazil); Eric Fujiwara (Unicamp, Brazil)

This work presents a straightforward, low-cost method for assessing the deflection of flexible elements to envisage applications in the field of soft robotics. The sensor comprises an optical fiber specklegram transducer coupled to a cantilever-type manipulator. The results yield absolute sensitivities of 0.37 N-1 and 0.05 cm-1 concerning force and deflection measurements, respectively, with a good agreement between simulation and experimental validation.

15:00 to 15:15 – TS-TUE-01-04

“Optical Encoding Model based on OAM beam superposition and Machine Learning detection”

By Erick Lamilla Rubio, Manuel Alvarez-Alvarado, Arturo Pazmino and Peter Iza (Escuela Superior Politecnica del Litoral, Ecuador)

An optical encoding model based on the coherent superposition of two Laguerre-Gaussian modes carrying orbital angular momentum is presented using Machine Learning detection method. In the encoding process, the intensity profile for the encoded data is generated based on selection of p and ℓ indices, while the decoding process is performed using support vector machine algorithm. Different encoding systems are designed and tested via simulations to verify the robustness of the proposed optical encoding model, finding a BER = 10−9 for 10.2 dB of signal-to-noise ratio in the best of the case.

15:15 to 15:30 – TS-THU-01-05

“Perpendicular optofluidic setup for real time droplet size measurements” (EDAS ID: 1570911214)

By Juliana de Novais Schianti (UnB, Brazil)

The purpose of this work is to offer a low cost and noninvasive set up for measurement of droplet dimensions. An optical fiber is positioned perpendicularly on the top layer of the device guiding the light emitted from a laser diode at the wavelength of 632.8 nm. In these devices, by varying the continuous oil flow rate, was obtained droplets dimensions in a going from around 250 μm to 400 μm. To better understand the experimental results, droplets transmittance pattern was analyzed using Finite Element Method modeling in a frequency domain.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-TUE-02 – MEMS 2

Chair: Yves-Alain Peter (Polytech. Montreal, Canada)  

16:00 to 16:30 - TS-TUE-02-01

Invited: “Displays and Imaging Systems Enabled by MEMS Scanners and Computational Holography”

By Hakan Urey (Koc University, Turkey)

I will present the story of MEMS laser scanners and computational holographic displays over the past 25 years that have been developed and commercialized by my group. In the first part of the talk, I will review the important figures of merit and the performance achieved for MEMS laser scanners using electromagnetic, electrostatic, and piezoelectric actuators. In the second part, I will discuss the basic principles and various applications of computational holographic displays, including head-worn displays, head-up displays, and a cataract vision simulator for ophthalmology clinics.

16:30 to 16:45 – TS-TUE-02-02

“Photoresponse of Diode-Biased Microelectrodes for Enhanced Microbial Metabolism”

By Tianqi Luo, Joey Talghader and Daniel Bond (University of Minnesota, USA)

Silicon microelectrodes are biased by pn junctions to voltages favorable to the metabolism of metal-reducing bacteria. The photo-generated current of these silicon photovoltaic cells far exceeds the current draw of known microbial biofilms.

16:45 to 17:00 – TS-TUE-02-03

“Micromachined Optical Scanner Using Acoustic Radiation Force”

By Takashi Sasaki (Silicon Austria Labs, Austria)

This paper reports on a micromachined 1D optical scanner using acoustic radiation force. This novel method allows us to actuate the mirror statically without any electrical connection by means of noncontact repulsive force generated by an acoustic radiator placed more than 2 mm far from the mirror. The optical scanning angle of more than 60 degrees was shown by a fabricated 2 mm square mirror in the experiment.

17:00 to 17:15 – TS-TUE-02-04

“Increasing MEMS micromirror line-scan rates through 3D-printed micro-optics”

By Ralf Bauer, Jay Christopher, Mark Donnachie and Deepak Uttamchandani (University of Strathclyde, United Kingdom (Great Britain))

Line-scan rates of mechanical scanners are in general limited to <100 kHz for scan mirror apertures of up to 1 mm. We present work to increase the line-scan rate of a MEMS micromirror beyond this through a scan multiplication unit consisting of a mirror, a cylindrical lens, and a 3D-printed cylindrical microlens array with 1 mm pitch and 2.5 mm effective focal length. Scan rates of up to 635 kHz at the scan line centre are demonstrated with seven array lenslets, with the compact multiplier having the potential to achieve over 1 MHz line-scan rate using higher element numbers.

Auditorium 2

14:00 to 15:30

Technical Session TS-TUE-03 – Optical Communication 1

Chair: Mônica Rocha (USP, Brazil)

14:00 to 14:30 - TS-TUE-03-01

Invited: “Impact of Mode-Dependent Gain on the Capacity of Ultra-Long-Haul SDM systems”

By Darli Mello (Unicamp, Brazil)

We review the fundamentals of MDG and its impact on the average, outage, and minimum capacities of ultra-long-haul SDM systems. We also study the challenges of estimating the MDG based on the receiver DSP. Our results dictate stringent MDG requirements for SDM amplifiers to ensure capacities equivalent to uncoupled transmission.

14:30 to 14:45 – TS-TUE-03-02

“Channel Allocation Analysis for EDFA-based C+L Optical Systems”

By Luis Gustavo Riveros and Carine Mineto (CPQD & Unicamp); Fábio D. Simões, Tiago Sutili (CPQD & Unicamp, Brazil); Rafael C. Figueiredo (CPQD, Brazil); Evandro Conforti (Unicamp, Brazil)

The channel allocation in a long-haul C+L optical link supported by a parallel EDFA-based amplification subsystem is comparatively analyzed for 80 channels allocated on C, L, or C+L optical band. The achieved results indicate gains on employing a less dense channel grid fully occupying the C+L band, resulting in a reduction of linear and nonlinear impairments.

14:45 to 15:00 – TS-TUE-03-03

“Performance Assessment of L-band High-Concentration EDFA using Power Masks”

By Marcionilo José da Silva (CPqD, Brazil); Luis Gustavo Riveros (CPQD & Unicamps, Brazil); Bethânia A Gomes and Carine Mineto (CPQD and Unicamp, Brazil); Júlia Aline Sousa Maciel and Fábio D. Simões (CPqD, Brazil); Tiago Sutili (CPQD & Unicamp, Brazil); Rafael C. Figueiredo (CPQD, Brazil)

Erbium-doped fiber amplifiers performance, especially designed with high doping concentration to operate at the optical L-band, were experimentally characterized in terms of gain, ripple, and noise figure power masks as a function of both pump power and signal input power. The results indicate the possibility of achieving an optical gain of around 15 dB with a nearly equalized output, using doped fibers with only 25 m of length.

15:00 to 15:15 – TS-TUE-03-04

“Extreme Gradient Boost Regression to model a SI-POF Link using OFDM Transmission”

By Jonathan Gois (CEFET/RJ, Brazil & UFF, Brazil); Flávio André Nogueira Sampaio (Orange, Brazil); Andrés Pablo López Barbero, Vinicius Nunes Henrique Silva and Tadeu Ferreira (UFF, Brazil); Luiz Anet Neto (Imt-atlantique, France)

The use of plastic optical fibers has become widespread due to its mechanical advantages and low cost, despite presenting considerable dispersion. This paper models an OFDM transmission link using the signal power, the bias current and the fiber length over an Extreme Gradient Boost regressor by fitting the multicarrier signal-to-noise ratio. The results show an improvement in the coefficient of determination, and in the error metrics, when compared to traditional modeling.

15:15 to 15:30 – TS-TUE-03-05

“Nonlinear Signal Degradation in Unrepeatered Optical Systems with Distributed Raman Amplification;

By Júlia A. Sousa Maciel and Marcelo P. Nogueira (CPQD, Brazil); Bethânia A Gomes (UNICAMP & CPQD, Brazil); Marcionilo José da Silva (CPqD, Brazil); Stefan Tenenbaum , Felipe Mejia and Gabriel Suzigan (Padtec, Brazil); Lailson Santos (Unicamp, Brazil); Alexander P. Ramirez (Padtec, Brazil); Eduardo Rosa, Fábio D. Simões and Rafael C. Figueiredo (CPQD, Brazil); Tiago Sutili (CPQD & Unicamp, Brazil)

The Kerr-related nonlinear signal distortion for unrepeatered optical links is evaluated for a 100-Gb/s single-channel scenario supported by first-order distributed Raman amplification. The results, comparing systems performance in terms of bit error rate for several optical fibers with dissimilar characteristics, indicate the importance to balance nonlinear and noise degradation to fully optimize the reach and capacity of this kind of system.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-TUE-04 – Optical Communication 2

Chair: Felipe Rudge Barbosa (Unicamp, Brazil)

16:00 to 16:30 - TS-TUE-04-01

Invited “Generation of Optical Frequency Combs by Fiber Recirculation Loops and/or Electro-optic Modulators”

By Aldário Chrestani Bordonalli (Unicamp, Brazil)

An optical frequency comb generator (OFCG) releases a special type of regular-repetition-rate light pulses that produce a sequence of coherent spectral lines of equal spacing around a stable optical carrier. Because of promising applications in different areas, OFCG design and implementation have recently received strong consideration. Among the various techniques employed for optical frequency comb generation, this lecture deals with two of them in particular, recirculation optical fiber loops and electro-optic modulators. Aspects of their different structures and corresponding experimental results towards applications in optical fiber communications are presented and commented.

16:30 to 16:45 – TS-TUE-04-02

“Optical OFDM transmission based on phase modulation and fiber bragg grating”

By Paulo de Tarso Neves, Jr., Luis C. Vieira and Alexandre Pohl (UTFPR), Brazil)

In this work, we propose an optical OFDM system using phase modulation followed by optical filtering and direct detection. A fiber Bragg grating is used as an optical filter for phase to amplitude conversion. The performance of the proposed system is investigated for both 16 QAM- and 64 QAMOFDM signals considering different numbers of training signals for frequency-domain channel estimation. With adequate choice of the training sequence length, BER results below 10−4 are reported for the 16 QAM based signal.

16:45 to 17:00 – TS-TUE-04-03

“Optimization of Unrepeatered Optical Links with Probabilistic Shaping for Heterogenous Propagation Regimes”

By Júlia Aline Sousa Maciel (CPQD, Brazil); Tiago Sutili (CPQD & Unicamp, Brazil); Rafael C. Figueiredo (CPQD, Brazil); Darli Mello (Unicamp, Brazil)

The impact of probabilistic shaping in unrepeatered optical communication links operating in the linear, quasi-linear, and nonlinear regimes is investigated. System performance is evaluated considering both uniform and Maxwell-Boltzmann constellations at three different representative launch power levels. Results show shaping-induced gains for all investigated scenarios.

17:00 to 17:15 – TS-TUE-04-04

“60-GHz 5G-NR Optical Fronthauls Based on CS-DSB Technique”

By Celso Henrique, Leticia Carneiro Souza, and Tomas P V Andrade (INATEL, Brazil); Evandro Conforti (Unicamp, Brazil); Arismar Cerqueira S. Jr. (INATEL, Brazil)

This paper reports the implementation of 5G New Radio (5G-NR) optical fronthauls based on radio-over-fiber (RoF) technology and optical carrier-suppressed double sideband (CSDSB) technique, operating at 60 GHz. Experimental results over 20-km fiber-optics links demonstrate the successful transmission of QPSK, 16-QAM and 64-QAM modulated signals with up to 400-MHz bandwidth. The proposed 5G-NR RoF system performance meets the 3rd Generation Partnership Project (3GPP) requirements, achieving a total throughput of 800 Mbps.

17:15 to 17:30 – TS-TUE-04-05

“Spectral Modulation of Antiresonant Hollow Core Optical Fiber with Flexural Acoustic Waves”

By Ricardo E. da Silva and  Marcos A. R. Franco (IEAv/CTA, Brazil)

Acousto-optic modulation of an antiresonant hollow core optical fiber employing flexural acoustic waves is numerically investigated for the first time. Acoustically induced attenuation of propagating core optical modes is simulated with the finite element method. The fiber's transmission spectrum is tuned by the acoustic amplitude and frequency, indicating an efficient possibility to Q-switch high power fiber lasers in the range of 1030 - 1090 nm.

Auditorium 3

14:00 to 15:30

Technical Session TS-TUE-05 – Lasers 2

Chair: Ricardo Samad (IPEN, Brazil)

14:00 to 14:30 - TS-TUE-05-01

Invited: “Random Lasers: review of research activities at IPEN”

By Niklaus Wetter; Renato J. R. Vieira, Danilo M. da Silva and Kelly C. Jorge (IPEN, Brazil); Ernesto Jimenez-Villar (UFPB, Brazil); Julia M. Giehl and Adriana R. de Miranda (IPEN, Brazil); Jessica Dipold (USP, Brazil)

Random lasers offer advantages such as low-cost fabrication and robustness in harsh environments and have applications in sensing, imaging, communications, and security. Our current research focuses on advanced materials, active control techniques, integration with other photonic structures, and exploration of Anderson localization and polydisperse effects. Coherent feedback in cavity-enhanced random lasers is discussed as means to achieve specific emission characteristics, and emission at 1300 nm is shown for the first time.

14:30 to 14:45 – TS-TUE-05-02

“Ionization Model to Estimate the Density and Temperature of fs-Laser-Induced Plasmas in Air”

By Armando V. F. Zuffi, Jhonatha dos Santos and Ricardo E. Samad (IPEN/CNEN, Brazil)

We present a simple ionization model to assess the density of femtosecond-laser-induced plasmas in air. It calculates the average ionization induced by the laser taking into account the threshold intensities for each ionic state, the beam spatial profile and the atmospheric composition, estimating the plasma density. The model density predictions are compared to experimental results obtained by a time-resolved Mach-Zehnder-like interferometer, and are also used as entry parameters to evaluate the plasma temperature by the Saha equation.

14:45 to 15:00 – TS-TUE-05-03

“Nonlinear refractive index analysis in a high-power Yb-doped double-clad fiber laser (YDCFL)”

By Elbis Cardoso and Pedro Bernardo S. Melo (USP, Brazil); Ricardo E. Samad (IPEN/CNEN, Brazil); Claudio C. Motta (USP, Brazil)

An analytical investigation of the nonlinear refractive index behavior of a high-power Yb-doped double-clad fiber laser (YDCFL) as a function of the pump power, transition frequency between a ground state (level 1) and an excited state (level 2), and pump saturation intensity of the transition is presented in this paper. In order to build the theoretical analysis, three fundamental expressions were used, which describe the changes in the nonlinear refractive index due to these quantum phenomena in the laser. The model was evaluated considering a 500W steady state fiber laser, operating in a two-end pumped configuration.

15:00 to 15:15 – TS-TUE-05-04

“Random laser emission in Nd3+ doped tellurite glass”

By Jessica Dipold (USP, Brazil); Camila Dias da Silva Bordon and Evellyn Magalhães (USP, Brazil); Luciana Kassab (Faculdade de Tecnologia do Estado de São Paulo (FATEC-SP), Brazil); Ernesto Jimenez-Villar (UFPB, Brazil); Niklaus Wetter (IPEN, Brazil)

Random lasers are easier and cheaper to manufacture than regular ones, being made of several materials such as polymers, powders or dyes. Glass random lasers have been rarely studied due to their inhomogeneous broadened emission and low damage threshold. Here, we study Nd3+doped TeO2-ZnO-Al2O3 glasses with different concentrations of rare-earth doping (4 wt.%, 8 wt.% and 16 wt.%). Emission intensity per fluency and fluorescence decay time measurements showed the potential of these glasses for random laser applications in the near-infrared region.

15:15 to 15:30 – TS-TUE-05-05

“Transverse electromagnetic modes simulation and experimental measurement technique for a single stripe laser diode”

By Fernando Carlos Romano and Niklaus Wetter (IPEN, Brazil)

A software model for a single stripe multimode laser diode has been developed. In addition, a method for measuring the transverse electromagnetic modes (TEM) in the RF spectrum through a frequency beating process was also developed. For supporting the TEM readings, a spectrum analyzer was applied and converting the temporal signals to the frequency domain using the fast Fourier transform (FFT) method.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-TUE-06 – Biophotonics 2

Chair: Denise Zezell (IPEN/USP, Brazil)

16:00 to 16:30 - TS-TUE-06-01

Invited: ”Exploring plasmonic nanoparticles in biomedical applications”

By Renato Evangelista de Araújo (UFPE, Brazil)

In this presentation the interaction of light with metallic nanoparticles will be described, and the use of plasmonic nanostructures on optical therapy and medical diagnosis will be reveled. Plasmonic properties rely on shape, size and material of the nanostructure. Metallic nanoparticles are explored as starting point for biosensing platforms. The engineering of plasmonic nanoplatforms for medical diagnostic will be discussed. Moreover, the use of plasmonic nanostructures in photothermal therapy will be examined. In this presentation, crucial optical parameters ruling plasmonic heating will be appraised.

16:30 to 16:45 – TS-TUE-06-02

“Quantitative biospeckle spectral and angular analysis of tomatoes at different ripening stages”

By Juan F. Serighelli, Eric Fujiwara and Cristiano MB Cordeiro (Unicamp, Brazil)

Quantitative biospeckle measurements in tomatoes at different ripening stages are reported. The biological activity was calculated with a correlation method using few seconds videos recorded with a low-cost, lensless webcam. 543 and 633 nm lasers were used as light sources similar or complementary to the tomato color. The webcam captures videos at different angles, close or away from the quasi-specular reflection. A new metric (ratio of the biospeckle activity at two wavelengths) was proposed, allowing for differentiating biological samples at different stages.

16:45 to 17:00 – TS-TUE-06-03

“Polarization-Diverse Bimodal Waveguide Interferometric Refractive Index Sensor”

By Marco A Silva (Universidade Presbiteriana Mackenzie, Brazil); Mauricio Moderno Carvalho (MackGraphe - Centro de Pesquisas em Grafeno, Nanomateriais e Nanotecnologia, Brazil); Christiano Matos (Universidade Presbiteriana Mackenzie, Brazil)

During the Covid-19 pandemic, the rapid and accurate pathogen detection has become increasingly important in preventing/mitigating future pandemics. Photonic biosensors have the potential to detect a variety of pathogens, with high sensitivity. Bimodal waveguides are among the most sensitive photonic sensors demonstrated. However, they generally require complex waveguide structures putting strain on fabrication. This study investigates an interferometric sensor that exploits the fundamental modes at orthogonal polarizations, thus allowing for the use of a standard silicon nitride rib waveguides. Simulation results using COMSOL Multiphysics indicate over 60% improvement in bulk sensitivity, relative to previously demonstrated bimodal waveguides.

17:00 to 17:15 – TS-TUE-06-04

“A 3D discriminant analysis for Hyperspectral FTIR images”

By Gleice Conceição Mendonça Germano (IPEN & CNEN, Brazil); Sajid Farooq (UPE, Brazil); Kleber Stancari (IPEN/CNEN, Brazil); Rocío Raffaeli (Universidad Nacional de La Plata, Argentina); Adele Croce (Universidad Nacional de La Plata, Brazil); Denise M. Zezell (IPEN/CNEN & USP, Brazil)

Here, we apply a 3D discriminant analysis approach to analyze FTIR hyperspectral images of normal vs malignant samples for skin cancer diagnosis. Our results evidence the outstanding performance with accuracy up to 81% for big data (> 100k).

17:15 to 17:30 – TS-TUE-06-05

“FBG thoracic strap for apnea tests”

By Gabriel H de Andrade, Sr., Ilda Abe and Acy Cidade Filho, Sr. (UTFPR, Brazil)

Respiratory movement is used to detect homeostatic changes in an individual organism. This manuscript reports a strap instrumented with fiber Bragg grating (FBG) for the analyses of respiratory movements during apnea cycles. Tests are performed by the voluntary using the FBG straps covered the entire thoracic circumference. The expansion of the ribcage cause the change in resonance wavelength of the FBGs. The apnea tests shows a decay due to oxygen loss of approximately 0.012 nm/s. Results shows that the FBG straps could be used for analyses of respiratory movements with high sensibility, allowing its use for health area.

Wednesday, August 2nd

Auditorium 3

09:00 to 12:30

Plenary Session PLS-G-WED

Chair: Azizur Rahman (City University of London, UK)

09:00 to 09:45 – PLS-G-WED-01

“Two-Dimensional Materials for Nanophotonics”

By Javier García de Abajo (ICFO-Institut of Photonic Sciences, Spain)

We explore new approaches relying on two-dimensional materials for nanophotonics, including plasmonics in ultrathin crystalline metals, quantum-phase materials, and recent advances in coupling between free-space light and confined optical excitations. Atomically thin materials provide a platform for manipulating and exploiting light at the nanoscale, with a wide range of polaritonic modes. Recent developments in thin noble-metal films have created a new realm in plasmonics and nanophotonics. We examine progress in controlling ultrafast and nonlinear optical processes, and their potential applications in light modulation and quantum optics.

09:45 to 10:00 – PLS-G-WED-02

“Gbps Laser-based Visible Light Communications”

By Boon Ooi (KAUST, Saudi Arabia)

Visible light communication (VLC or LiFi) has attracted much attention in recent years. Data rate of multiple 100s Mbps has been accomplished using LEDs as transmitter. Recently, micro-LED and laser-based device and system technologies have been topics for intense research for Gbps VLC. in this talk, in addition to providing a general overview of recent advances in VLC, from the perspective of optics devices, I will discuss various challenges facing VLC and offers insights into the possible solutions.

10:30 to 11:00 - Coffee Break

Chair: Gustavo Wiederhecker (Unicamp, Brazil)

11:00 to 11:45 – PLS-G-WED-03

“Quantum Technologies for São Paulo, Brazil and Latin America”

By Paulo Nusssenzveig (USP, Brazil)

The world is experiencing a second quantum revolution, with the introduction of emerging technologies based on generalizations of information science using principles of quantum physics. Concepts such as interference, indistinguishability, uncertainty, and quantum entanglement provide additional resources for processing, storing, and transmitting information, as well as allowing more sensitive measurements of physical quantities. In São Paulo, Brazil, and Latin America, we have important groups conducting academic research in this area but relatively few efforts to transform this knowledge into technologies. We will present proposals to change this situation, pointing out some sectors in which we can be especially competitive in the development of emerging quantum technologies.

11:45 to 12:30 – PLS-G-WED-04

“Spectral imaging: from push-broom scanning to integrated subwavelength filters”

By Sailing He (Zhejiang University, China; Royal Institute of Technology, Sweden)

I will present some of our recent results on scanning based hyperspectral imagers, as well as miniaturized spectrometers and spectral imaging system based on emerging subwavelength structures. Combining with some advanced reconstructive algorithms, miniaturized spectral imaging based on subwavelength filter arrays, tunable filters and co-modulated filter arrays is promising for e.g. portable consumer electronics and wearable devices.

12:30 to 14:00 – Lunch Break

Auditorium 1

13:30 to 15:30

Technical Session TS-WED-01 – Exhibitors Panel

Chair: Rodrigo Vicentini (Keysight, Brazil)

13:30 to 14:00 - TS-WED-01-01

“Let’s Talk About Lumerical”

By Igor Feliciano da Costa (ESSS/Ansys)

Ansys Lumerical's Photonic Multiphysics Simulation tools enable seamless workflows to model optical, electrical, thermal and quantum effects at the physical level. Ansys Lumerical's Photnoic Integrated Circuit Simulation tools offer a rich set of analysis capabilities to design and optimize the performance of photonic integrated circuits. Lumerical’s tools have been designed to tackle the most challenging photonic design problems across fields including integrated optics, metamaterials, CMOS imaging, and more

14:00 to 14:45 – TS-WED-01-02

“Single Photon Test and Measurement”

By John Dorighi (Keysight Technologies, USA)

Photonic integrated circuits (PICs) are a key enabler for scaling bulk optic quantum devices to production for real world applications, I will highlight classic measurements for PICs characterization. An additional challenge for quantum photonic integrated circuits (qPICs) is the requirement to generate, control, and measure single photons. I will discuss recent work performed at Keysight to generate faint laser photons, control polarization to generate qubits, and measure using single photon detectors. I will review applications which integrate these capabilities for quantum communication research, including a laboratory test bed for quantum key distribution (QKD). The QKD test bed performs link calibration, automates the process of generating and analyzing keys, and reports important link metrics such as raw key generate rate and quantum bit error ratio (QBER).

14:45 to 15:15 – TS-WED-01-03

“Atomic Force Microscopy: An Introduction”

By Luiz Fernando Zagonel (Unicamp, Brazil)*

In this presentation we will discuss the basic concepts associated with atomic force microscopy and aspects of associated instrumentation. We will also discuss the applications of the technique, from its various modes of use.

*Luiz Fernando Zagonel graduated in Physics at the Universidade Federal do Paraná in 2000, got his master’s in Physics at the Universidade Federal do Rio Grande do Sul (2002) and his PhD in Physic at Universidade Estadual de Campinas (2006), all in Brazil. Currently, he works as a faculty member at the Campinas State University. He works in Solid State Physics, acting on the following subjects: electronic properties of matter, nano-technology, and scanning probe microsocopy.

(Note: A Thorlabs’ representative will demonstrate, on site, its Atomic Force Microscope Educational Kit)

15:15 to 15:30 – TS-WED-01-04

“Advanced photonics product development for high-end applications”

By Luis Henrique Hecker Carvalho (Lumentum, Brazil)

Lumentum is a market-leading designer and manufacturer of innovative optical and photonic products enabling optical networking and laser applications worldwide. Lumentum is headquartered in San Jose, California with R&D, manufacturing, and sales offices worldwide. In this presentation, Luis Hecker will share more details about technology capabilities at the Lumentum location in Campinas, Brazil from highly complementary and differentiated transceiver product lines to digital communications ASICs, including coherent DSPs, to X-ray detectors. Luis will also discuss important role that this site plays in helping speed up go-to-market time from R&D to NPI lines for the company's state-of-the-art products.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-WED-02 – Workshop: Machine Learning for Optical Communication

Chair: Joaquim Martins Filho (UFPE, Brazil) 

16:00 to 16:15 - TS-WED-02-01

“How Artificial Intelligence can impact photonic networks?”

By Carmelo Bastos-Filho (UPE, Brazil)

Artificial intelligence is transforming photonic networks, making them more efficient, reliable, and intelligent. It plays a crucial role in automation, design, resource optimization, and data analysis, enabling better service delivery at lower cost. Several lines of AI are used in the areas of photonic networks, such as Machine Learning, which allows systems to learn from data, restoring signal shapes, finding better routes, or anticipating failures without being explicitly programmed; and intelligent metaheuristics, which are used to solve complex optimization and search problems, allowing efficient solutions to be found in multidimensional search spaces, such as network optimization, resource allocation and device design.

16:15 to 16:30 – TS-WED-02-02

“MDG and SNR estimation in SDM optical systems using machine learning”

By Darli Mello (Unicamp, Brazil)

The increase in capacity provided by coupled space division multiplexing (SDM) systems is fundamentally limited by mode-dependent gain (MDG) and amplified spontaneous emission (ASE) noise. Therefore, monitoring MDG and optical signal-to-noise ratio (SNR) is essential for accurate performance evaluation and troubleshooting. Recent works show that the conventional MDG estimation method based on the transfer matrix of multiple-input multiple-output (MIMO) equalizers optimizing the minimum mean square error (MMSE) underestimates the actual value at low SNRs. Besides, estimating the optical SNR itself is not a trivial task in SDM systems, as MDG strongly influences the electrical SNR after the equalizer. In a recent work we propose an MDG and SNR estimation method using artificial neural networks (ANNs). The proposed ANN-based method processes features extracted at the receiver after digital signal processing (DSP). In this paper, we discuss the ANN-based method in detail, and validate it in an experimental 73-km 3-mode transmission link with controlled MDG and SNR. After validation, we apply the method in a case study consisting of an experimental long-haul 6-mode link. The results show that the ANN estimates both MDG and SNR with high accuracy, outperforming conventional methods.

16:30 to 16:45 – TS-WED-02-03

“Linear and nonlinear transceiver impairments compensation via deep learning equalization for 1 Tb/s coherent optical systems”

By Leonardo Didier Coelho (UFPE, Brazil)

In order to satisfy the demand of Internet connectivity, the optical communications systems industry urge for high-capacity and cost-effective solutions over a wide range of applications such as submarine, terrestrial long-haul, metro and access networks, for traditional telecom services providers (TSP), and data center interconnect (DCI), for cloud services providers (CSP). In this way, the coherent line interfaces continue to evolve the transmission rate per wavelength from 100 Gb/s to 800 Gb/s in commercial systems. To support the growing traffic demands, the next frontier in coherent technology pushes the single wavelength capacity towards 1 Tb/s. To achieve a high transmission rate per wavelength as 1 Tb/s, the main physical degrees of freedom to explore in a coherent optical transceiver are the number of optical subcarriers, modulation format, and symbol rate. Regarding the first, single-carrier approaches come up as an attractive solution compared with multi-carrier implementations due to the reduced transceiver complexity and cost. Specifically for a single-carrier solution, the combination of high-order quadrature amplitude modulation (QAM) format, as the dual-polarization (DP) 16QAM in contrast with DP-64QAM, and high baud rate, currently, is the best option to scale the bit rate of a coherent line interface, yielding to a reasonable trade-off between implementation cost and system performance. Nevertheless, optical systems based on high-order QAM modulation and high symbol rate are highly impacted by optical fiber nonlinear distortions, noise sources and transceiver impairments such as linear and nonlinear distortions of electrical and optical components. Now, efforts are made to mitigate nonlinear effects imposed by the optical fiber and also distortions imposed by the transmitter and receiver and, among them, the deep learning equalization has been a promising solution. In this seminar, we present and evaluate an alternative receiver (Rx)-based deep cascade-forward neural network (CDNN) for transceiver impairments compensation applied to 1 Tb/s coherent optical systems. Also, we describe the future works in order to implement a deep learning equalizer for coupled transceiver-fiber nonlinearity mitigation and to define the optimum neural architecture.

16:45 to 17:00 – TS-WED-02-04

“Enabling the proactive minimization of fragmentation losses in elastic optical networks using machine learning”

By Helio Waldman (Unicamp, Brazil)

Elastic optical networks (EONs) have emerged in the past decade to promote efficiency in the use of the fiber optical spectrum by a heterogeneous dynamic traffic. For this purpose, it allocates to each user only the number of spectrum slots it needs to meet its bitrate and distance requirements, so the allocated slots reach an efficiency close to the Shannon limit. However, the heterogeneity and dynamicity of the demand produce long-living spectral voids that degrade the spectral efficiency, so the non-allocated slots may stay deadlocked for a long time. In order to address this problem, machine learning may be used in order to estimate, in real-time, the profile of the demand for connections given by the sizes of the requests and their rates of arrival. With this knowledge, we have already shown, in a paper published in 2022, that both first-fit and exact-fit algorithms may be outperformed in a single link by a new algorithm that is aware of the sizes that may be requested by the traffic. We are currently extending this capability by expanding the traffic-awareness to include the knowledge of the rates of request of each connection size. Preliminary results of this approach will be shown in the presentation, assuming adjacent assignments. The results confirm the expectation of strongly enhanced reduction of fragmentation losses in many instances, but not all. We expect to obtain more consistent results by combining the new algorithm with the previous one.

17:00 to 17:15 – TS-WED-02-05

“Deep Learning for routing and spectrum assignment assessment”

By Raul C. Almeida Jr (UFPE, Brazil)

Lightpath establishments and releases in Elastic Optical Networks generate fragments of available slots that whenever the size of these fragments are inferior to the number of requested slots path-request blockings occur. To mitigate such undesired effect, an efficient spectrum assignment heuristic known as Min Slot-Continuity Capacity Loss (MSCL) was proposed. MSCL receives the slot-availability vector of routes potentially affected by the establishment of a request and calculates the reduction in assignment capacity that would occur if a specific group of contiguous slots were chosen to attend the request. This is performed for each route and the group of slots that provides the lowest loss of capacity is chosen. MSCL is shown in the literature to be very efficient, but is computationally intensive. We present two classifier models based on deep neural networks to speed up the MSCL spectrum assignment operation. The first decides between the use of First-Fit or MSCL heuristic, with the aim of avoiding unnecessary MSCL calls whenever the application of First-Fit would provide the same minimum loss of capacity as MSCL. The second adds the capability of pointing out the correct portion of the spectrum MSCL should look for whenever First-Fit is not selected. Compared to the MSCL, simulation results demonstrate great reductions on the execution time of the two proposed models without compromising blocking performance.

17:15 to 17:30 – TS-WED-02-06

“Federated Learning over Ethernet Passive Optical Networks”

By Nelson Fonseca (Unicamp, Brazil)

Federated Learning (FL) enables distributed machine learning while preserving user privacy by training local models using private datasets and sharing only model parameters with a central server. However, FL imposes specific latency and bandwidth requirements, requiring efficient resource allocation in the communication network. This work introduces two novel Dynamic Wavelength and Bandwidth Allocation (DWBA) algorithms for Time and wavelength Division Multiplexing Passive Optical Networks (TWDM-PONs). The first algorithm employs bandwidth reservation, while the second utilizes statistical multiplexing to ensure Quality of Service (QoS) provisioning for FL traffic over 50 Gb/s Ethernet PON networks (50-EPON). These algorithms improve the TWDM-PON operations by effectively allocating resources for FL processing while preserving QoS for other network traffic. This contribution facilitates the practical deployment of FL in PON environments by addressing the network requirements of FL operations without compromising the QoS demands of delay-critical applications.

Auditorium 2

14:00 to 15:30

Technical Session TS-WED-03 – Nanophotonics 1

Chair: Joseph Talghader (University of Minnesota, USA)

14:00 to 14:30 - TS-WED-03-01

Invited: “Colloidal versus substrate-based plasmonic materials”

By Andreas Seifert (NanoGune, Spain)

The talk will be about periodic superlattices of noble metal nanoparticles which have demonstrated superior plasmonic properties compared to randomly distributed plasmonic arrangements due to near-field coupling and constructive far-field interference. To illustrate that, the investigation and optimization of a chemically driven, templated self-assembly process of colloidal gold nanoparticles will be presented.

14:30 to 14:45 – TS-WED-03-02

“Nanophotonic cavity modes from subwavelength polaritons of polar two-dimensional crystals”

By Francisco Maia (Centro Nacional de Pesquisa em Energia e Materiais, Brazil); Flávio Feres (Unicamp, Brazil); Raul Freitas (LNLS, Brazil); Ingrid David Barcelos (Centro Nacional de Pesquisa Em Energia e Materiais, Brazil)

Cavity modes have fundamental importance in nanophotonics as in the two-dimensional (2D) crystals' optical response supporting subwavelength polaritons. Typically, high momenta polaritons in 2D crystals create cavity modes dependent on boundary conditions dictated by the material geometrical forms, substrate electrical permittivity and the optical probes used to interrogate the phenomenon. Here, we use a synchrotron infrared nanospectroscopy to probe polaritonic cavities in hexagonal boron nitride 2D crystals lying on metallic and dielectric substrates. From theoretical approach in quantitative agreement with experimental real-space imaging of polariton waves, we derive the dispersion relation and the reflection/transition coefficients governing the polaritonic cavities.

14:45 to 15:00 – TS-WED-03-03

“Nonlinear Frequency Conversion by Silicon Nitride Waveguide Integrated with MoS2”

By Mohd Rehan (Mackenzie Presb. Univ., Brazil); Nathalia B Tomazio (USP, Brazil); Rodrigo Gerosa (Mackenzie Presb. Univ., Brazil); Alisson R Cadore (IPEN, Brazil); Gustavo Wiederhecker (Unicamp, Brazil); Christiano de Matos (Mackenzie Presb. University, Brazil)

This paper presents the characterization of a silicon nitride waveguide engineered with monolayer MoS2 flakes for nonlinear frequency conversion applications. The 2D material was mechanically exfoliated and deterministically dry transferred to selected areas of the waveguide. Comparing similar waveguides with and without MoS2, we observe that the 2D material provides enhancement in the intensity of second- and third-harmonic generation for the horizontal (TE) polarization, with a 150 fs, 89 MHz pump at 1560 nm.

15:00 to 15:15 – TS-WED-03-04

“Bicontrollable optical and plasmonic waveguide”

By Freddy Orlando Jara Poma (Unicamp, Brazil); Ruth Rubio-Noriega (INICTEL-UNI, Peru); Hugo Enrique Hernandez-Figueroa (Unicamp, Brazil)

In this work, we propose electrical and thermal control over a horizontal slot waveguide. The proposed device takes advantage of the thermally dependent transition phases of Vanadium Dioxide (VO2), and a high r33 electro-optic polymer called BAY1, which is responsible for the electrical control. We demonstrated a transitioning waveguide which can be used in different applications ranging from phase shifting to plasmonic waveguide feeding by engineering the effective index and mode distribution. Additionally, we report a band gap in our modal analysis that can be engineered without using periodical segmentation, rendering our discovery a useful bicontrollable metawaveguide.

15:15 to 15:30 – TS-WED-03-05

“Organic resist based fabrication of integrated waveguides and ring resonators in thin-film lithium niobate”

By Felipe Boechat Mazzi and Felippe Alexandre Silva Barbosa (Unicamp, Brazil)

Thin-film lithium niobate (TFLN) is a promising candidate for photonic-based quantum information technology. This platform combines large nonlinear and electro-optical coefficients with the tight confinement and reduced footprint characteristic of integrated devices. Nonetheless, current high-performance devices in TFLN generally rely on the use of hydrogen-silsesquioxane (HSQ) resist, or on silicon dioxide hardmasks, adding complexity to the fabrication process. Here, we fabricate and characterize optical resonators in TFLN using readily available organic deep UV resist. This process constitutes an alternative for more accessible microfabrication of TFLN photonic devices.

15:30 to 16:00 - Coffee Break

16:00 to 17:15

Technical Session TS-WED-04 – Integrated Photonics and Optoelectronics 2

Chair: Frederic Zamkotsian (Laboratoire d’Astrophysique de Marseille, France)

16:00 to 16:30 - TS-WED-04-01

Invited:”CMOS-compatible Si-TiN Schottky SWIR photodetectors enhanced by pyramidal nanostructures”

By Lion Augel (Fraunhofer IPMS & Brandenburg University of Technology Cottbus-Senftenberg, Germany), Hanying Wen (Fraunhofer IPMS, Germany); Jens Knobbe (Fraunhofer IPMS, Germany)

Short-wavelength infrared detection has shown an enormous potential for future application in autonomous systems and security. Up to today the use has been limited by the cost for high quality detectors. Using TiN Schottky barrier photodetectors with pyramidal photonic nanostructures opens a path to circumvent the typically low quantum efficiencies with compatibility to CMOS technology

16:30 to 17:00 – TS-WED-04-02

Invited: “Silicon Photonics with Integrated MEMS”

By Niels Quack and  Alain Yuji Takabayashi (University of Sidney, Australia); Hamed Sattari (EPFL, Switzerland), Pierre Edinger, Kristinn B. Gyfason and Gaehun Jo (KTH,Sweden), Peter Verheyen (IMEC, Belgium), Moises Jezzini and Peter O'Brian (Tyndall National Institure, Ireland), Umar Khan (Ghent University, Belgium), Wim Bogaerts (IMEC, and Ghent University, Belgium)

In this talk we will discuss recent advances in wafer-scale integration of Micro-Electro-Mechanical Systems in a standardized Silicon Photonics platform. Our high-performance Silicon Photonic MEMS tuneable couplers, filters, switches, and phase shifters, provide an advanced technology basis for emerging applications requiring very large-scale photonic integration. We will outline the assembly approach for interfacing with optical fibres and integration with control electronics to enable programmable photonic integrated circuits.

17:00 to 17:15 – TS-WED-04-03

“Robust Edge States in C6 Topological Photonic Crystals”

By Daniel Borges-Silva (UFRN, Brazil); Carlos Humberto Costa (UFCE, Brazil); Claudionor Gomes Bezerra (UFRN, Brazil)

We study the edge states that emerge in a system composed of a topological photonic crystal and a trivial one. We verify the emergence of the edge modes and we investigate their main features. Our numerical results show that they are pseudospin modes and they are well localized at the interface between both photonic crystals. Furthermore, the robustness is studied by adding defects at the interface. We verify that the defects have mild effects on the transmission of the light along the system. We conclude that the edge modes are protected by topology and robust against disorders and defects.

Auditorium 3

14:00 to 15:30

Technical Session TS-WED-05 – Sensors, Image and Illumination 2

Chair: Diego Rátiva (UPE, Brazil)

14:00 to 14:30 - TS-WED-05-01

Invited: “Synchrotron characterization of metal halide perovskites”

By Rodrigo Szostak* (LNLS/CNPEM, Brazil)
(*remote from France)

Metal halide perovskite (MHP) emerged in the last two decades and received attention due to its optoelectronic properties appropriated to use in several applications, such as X-ray detectors, LEDs, and solar cells. Besides the high efficiency obtained in the last years, several aspects need to be better understood to lead this technology to maturity and commercialization. In this context, synchrotron-based techniques play an important role in allowing the characterization of the MHP in films, during preparation, or complete devices in ex-situ, in situ, or operando conditions. This lecture will summarize last year's contribution of the Brazilian Synchrotron Light Laboratory (LNLS) to the characterization of MHP. Also, recent results obtained at the CARNAÚBA (Coherent X-Ay NAnoprobe BeAmline) will be shown.

14:30 to 14:45 – TS-WED-05-02

“Improving Solar Cells Efficiency with PMMA-Carbon Dots Nanocomposites”

By Marco C P Soares (Unicamp, Br); Francesco Amato (Univ. of Trieste, Italy); Thiago D Cabral (Unicamp, Br); Michele Cacioppo (Univ. of Trieste, Italy); Marcelo Carreño,  Inês Pereyra, Carlos Ramos, Manuel Cid, Gilson S Goveia and José Chubaci (USP, Br); Maurizio Prato (Univ. of Trieste, Italy); Julio R Bartoli and Eric Fujiwara (Unicamp, Brazil)

Nitrogen-doped carbon nanodots synthesized from L-arginine and ethylenediamine (NCNDs) were combined to PMMA for obtaining fluorescent nanocomposites. Since this photoluminescence could increase the efficiency of solar energy concentrators and generators, photovoltaic cells were coated with such materials. Even using a setup with low contact of the optical polymer film on silicon surface, a promising 11.3% increase of cell efficiency was observed, showing the feasibility and potential for application of these environmentally friendly materials.

14:45 to 15:00 – TS-WED-05-03

“Pigtailed Polymeric Optical Biosensor based on Interferometric Multimode Waveguide and Image Processing”

By Ursula Salazar Roggero and Jorge R Fernández (Unicamp, Brazil); Andreas Seifert (CIC NanoGUNE, Spain); Hugo Enrique Hernandez-Figueroa (Unicamp, Brazil)

Operating optical biosensors outside laboratories presents a major challenge. This work presents a novel approach by introducing a practical coupling mechanism and using SU- 8 polymer to reduce the complexity of the fabrication process. Additionally, software techniques used for detection allow for potential improvements without requiring costly hardware. The limit of detection of the proposed device is 3 × 10−5 RIU.

15:00 to 15:15 – TS-WED-05-04

“Optical Fiber Speckle-Based Musical Interface”

By Yu Tzu Wu and Eric Fujiwara (Unicamp, Brazil)

This paper demonstrates a simple piano-inspired interface to play a full C major scale based on an optical fiber specklegram quasi-distributed sensor. The user inputs musical notes via foam pads over one multimode optical fiber connected to a laser source and webcam. Correlating the reference and immediate specklegrams retrieves the note input, subsequently played via audio output connected to the webcam. The interface is demonstrated with a precision of ~0.94% for eight musical notes plus a neutral state and does not depend on the input order.

15:15 to 15:30 – TS-WED-05-05

“Biodegradable ball lenses made of agar”

By Lidia O Rosa and Eduarda F Morais, Cristiano MB Cordeiro and Eric Fujiwara (Unicamp, Brazil)

This work reports the fabrication of agar ball lenses, a biodegradable, edible, and renewable material. Pouring melted agar-glycerol-water solutions into vegetable oil produces transparent spheres whose refractive index and diameter change with glycerol concentration and agitation speed. The results confirm the agar lens feasibility for imaging and suggest possible applications in illumination and biomedical sensing.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-WED-06 – Optics and Instrumentation 2

Chair: Cícero Martelli (UTFPR, Brazil)

16:00 to 16:30 - TS-WED-06-01

Invited: “Interferometry in harsh environments”

By Armando Albertazzi (UFSC, Brazil)

Interferometry is widely used to measure various physical quantities. Due to its high sensitivity, its use is normally restricted to laboratory environments. However, there are demands for interferometry outside the lab. This lecture presents the agents that make the application of interferometry difficult in hostile environments, like vibrations, temperature, humidity, air currents and radiation, and their deleterius effects on interferometry measurements. It also presents three strategies for interferometry measurements in hostile environments: isolation, robustness and the combination of both. Finally, five interferometric systems that operate successfully in hostile environments are presented.

16:30 to 16:45 – TS-WED-06-02

“An h3S gas sensor based on Long Period Gratings-Mach Zehnder Interferometer”

By Andre Dias Sousa, Juan D Lopez, Paulo Henrique S Pinto, Regina Allil and Marcelo Werneck (UFRJ, Brazil)

This work presents a hydrogen sulfide (h3S) gas sensor manufactured using a Long Period Gratings-Mach Zehnder (LPG-MZ) interferometer that was coated with CuO2 nanoparticles. The LPG-MZ was fabricated using the electric arc discharge method, and the resulting sensor was coated with CuO nanoparticles. Prior to testing with h3S, the sensor was characterized with aqueous solutions of varying refractive indices (RI), with a sensitivity of 186 nm/RIU between 1.35 and 1.39. The sensor was then tested with h3S concentrations ranging from 0 to 40 ppm, and exhibited a sensitivity of approximately 7.8 pm/ppm between 5 and 20 ppm.

16:45 to 17:00 – TS-WED-06-03

“Chlorophyll Fluorescence Analysis to Evaluate the Photo-oxidation Process in Organic Soybean Oil”

By Carla Lopes (UNIFESP, Brazil); Lilia Coronato Courrol (Instituto de Ciências Ambientais, Químicas e Farmaceuticas, Brazil & UNIFESP, Brazil)

The chlorophyll fluorescence (Ex/Em: 411/667 nm) of organic, non-transgenic, and cold-extracted soybean oils was analyzed to evaluate the photosensitized oxidation. A strong negative correlation (r≥-0.94) was recorded between emission intensity and lipid oxidation indicators.

17:00 to 17:15 – TS-WED-06-04

“Development of an Imaging System for an Electron Spectrometer for laseraccelerated electrons.”

By Vitória Macêdo Costa Brandão (USP, Brazil); Ricardo E. Samad (IPEN/CNEN, Brazil)

We present the development of a Thomson spectrometer with an imaging system to determine the energy spectrum of laser accelerated electrons. The spectrometer is composed by a region with a constant magnetic field that deflects relativistic electrons according to their kinetic energy, and a luminescent screen into which the electrons impinge. The imaging system optimizes the collection of the screen luminescence, which is inside a vacuum chamber, and magnifies it, through a window, into a CCD in atmosphere that records the light pattern, from which the energy spectrum is recovered.

17:15 to 17:30 – TS-WED-06-05

“Applications of Spectral Interferometry in sub-THz, Infrared and Optical Frequency Ranges”

By Konstantin Alexandrovich Lukin and Dmytro Tatyanko (UIRE, NAS of Ukraine, Ukraine); Sergii Lukin (University of Alcalá, Spain)

The paper presents some results of the noise spectral interferometry (SI) for precise distance measurement in sub-THz Infra-Red and optical radiations using low-coherence optical sources beyond their coherence zone. It is shown that when the path difference of arms in Michelson interferometer exceeds the coherence length of the light-emitting diode radiation, the interference pattern in spectral domain enables to perform absolute measurements of micro- and nano- distances due to its dependence on both time delay and relative phase of the signals. Application of SI for coherent imaging in X-ray is briefly discussed

Thursday, August 3rd

Auditorium 3

09:00 to 12:30

Plenary Session PLS-G-THU – 5thWebinar of the Brazilian Photonics Laboratories Systems, SISFOTON-MCTI

Chair: João Batista Rosolém (CPQD, Brazil)

09:00 to 09:15 – PLS-G-THU-01


By Felipe Silva Bellucci (General Coordinator of Enabling Technologies of the Ministry of Science, Technology and Innovation, Brazil (MCTI)

Sisfóton is an initiative of the General Coordination of Enabling Technologies – CGTH of the MCTI – Ministry of Science, Technology and Innovation. The objective is to promote unity among the actors of the ecosystem for Brazilian innovation in photonics (academy, ICT, industry and startups) and actions aimed at the country's scientific, technological, economic and social development. Sisfóton defines two complementary roles throughout its development – namely the Integrator Laboratory (CPQD) and the General Laboratories.

09:15 to 09:30 – PLS-G-THU-02


By Vanderlei Bagnato (Coordinator of Sisfoton Laboratory at University of São Paulo (USP)),

09:30 to 09:45 – PLS-G-THU-03


By Lauro June Queiroz Maia (Coordinator of Sisfoton Laboratory at Federal University of Goiás (UFG)),

09:45 to 10:00 – PLS-G-THU-04


By Anderson Rodrigues Lima Caires.(Coordinator of Sisfoton Laboratory at Federal University of Mato Grosso do Sul (UFMS)),

10:00 to 10:15 – PLS-G-THU-05


By Moisés Felipe Teixeira (Vice-Coordinator of Sisfoton Laboratory at National Service of Industrial Apprenticeship (SENAI),

19:15 to 10:30 – PLS-G-THU-06


By Marcelo Nalin (Vice-Coordinator of Sisfoton Laboratory at São Paulo State University - Júlio de Mesquita Filho (UNESP)),!/fotonicos/

10:30 to 11:00 - Coffee Break

Chair: Rafael Figueiredo (CPQD, Brazil)

11:00 to 11:15 – PLS-G-THU-07


By Débora M. B. Pereira Milori (Coordinator of Sisfoton Laboratory at Brazilian Agricultural Research Company (EMBRAPA)),

11:15 to 11:30 – PLS-G-THU-08


By Newton C. Frateschi (Coordinator of Sisfoton Laboratory at University of Campinas (UNICAMP)),

11:30 to 11:45 – PLS-G-THU-09


By Anderson Stevens L. Gomes (Coordinator of Sisfoton Laboratory at Federal University of Pernambuco (UFPE)),

11:45 to 12:00 – PLS-G-THU-10


By Maria José Pontes (Vice-Coordinator of Sisfoton Laboratory at Federal University of Espírito Santo (UFES)),

12:00 to 12:15 – PLS-G-THU-11


By Wagner de Rossi and Denise Maria Zezell (Coordinator and Vice-Coordinator of Sisfoton Laboratory at National Nuclear Energy Commission (CNEN)),

12:15 to 12:30 – PLS-G-THU-12


By João Batista Rosolem (Coordinator of Sisfoton Integrator Laboratory at Research and Development Center in Telecommunications (CPQD)),

12:30 to 14:00 – Lunch Break

Auditorium 1

14:00 to 15:30

Technical Session TS-THU-01 – Photonics 2

Chair: Ralf Bauer (University of Strathcycle, UK)

14:00 to 14:30 - TS-THU-01-01

Invited: “Harnessing optical nonlinearities with integrated photonics structures”

By Gustavo Wiederhecker (Unicamp, Brazil)

Harnessing optical nonlinearities with integrated photonic structures allows for remarkable regimes of nonlinear optics at low power levels. By recirculating light in optical microcavities, the intensity of the stored field amplifies interaction between light and matter by thousands of times. In this presentation, I will discuss fundamental concepts and our recent progress in this field, focusing on how these microstructures can reshape the nonlinear interaction and lay a fertile soil for sensing, communications, and second-generation quantum technologies.

14:30 to 14:45 – TS-THU-01-02

“Plasmonic signals modified by dielectric layers and exploited by multivariate analysis”

By Jaione Etxebarria-Elezgarai (CIC NANOGUNE, Spain); Luca Bergamini (University of the Basque Country UPV/EHU, Spain); Eneko Lopez Corrillero (CIC NanoGUNE, Spain); Maria Carmen Morant-Miñana (CIC EnergiGUNE, Spain); Jost Adam (University of Southern Denmark, Denmark); Andreas Seifert (CIC nanoGUNE)

We present a sensing device that combines plasmonic Au nanodiscs with dielectric layers. The sensor is operated in Kretschmann configuration and delivers highly complex and sensitive reflectance curves as a result of hybridized plasmons and Fresnel reflections from the microfluidic device in which the plasmonic chip is embedded. Using multivariate analysis for analyzing multiple features of the reflectance curves in angular interrogation, strongly helps improve the sensing performance in comparison with a standard sensing chip of a continuous Au thin film. We improve analytical sensitivity, sensor resolution, and prediction errors by 200%, 23%, and 38% respectively.

14:45 to 15:00 – TS-THU-01-03

“High Absorption per Unit Mass Subwavelength Structure as Uncooled Infrared Detector”

By Avijit Das, Merlin Mah and Joseph Talghader (University of Minnesota Twin Cities, USA)

A subwavelength perforated structure designed for a maximum absorption-to-mass ratio has been utilized to construct an uncooled infrared (λ~8-12 µm) thermal detector operating in the air with a noise equivalent temperature difference (NETD) of 23 mK and detectivity of 1.1×10^(9) cmHz^(0.5)/W while time constant is 1.5 ms. With a fill factor of ~27%, the detector shows an average absorption per unit mass of ~6.8×10^(12) kg^(-1) over the long-wave infrared regime. Mach-Zehnder interferometry has been used for the optical readout of the detector.

15:00 to 15:15 – TS-THU-01-04

“Efficient Beamforming Using Magneto-Optical Metagratings for Terahertz Communications”

By William O. F. Carvalho (UNIFEI, Brazil); Jorge Ricardo Mejía-Salazar (Inatel, Brazil); Danilo Spadoti (UNIFEI, Brazil)

This work presents a magneto-optical (MO) metagrating for beamforming at f = 300 GHz. Our device comprises a periodic arrangement of aluminum and indium antimonide semiconductor. Numerical results show diffraction angles of ± 45°, with transmittance and extinction ratios of 0.54 and 0.74, respectively. Results are promising for future dynamic THz communications.

15:15 to 15:30 – TS-TUE-01-05

“Mixing Neural Networks and Genetic Algorithms for Optimized LSPR Biosensor Design” (EDAS ID: 1570911750)

By Felipe Aragão Nogueira De Freitas, Omar Neto and Jhonattan Cordoba Ramirez (UFMG, Brazil)

Localized Surface Plasmon Resonance devices have garnered attention and demonstrated noteworthy promise in response to the growing demand for more precise and effective tools in the medical field. However, LSPR devices require optimized geometry to deliver high accuracy, which poses an inherent challenge for their use. In this paper, we present a novel methodology embedded in an in-use intelligent tool that uses a Genetic Algorithm and Neural Network for modeling and data processing in LSPR devices for biosensing applications.

15:30 to 16:00 - Coffee Break

16:00 to 17:00

Technical Session TS-THU-02 – Photonics 3

Chair: Joseph Talghader (University of Minnesota, USA)

16:00 to 16:30 - TS-THU-02-01

Invited: “Optomechanical quantum teleportation”

By Thiago Alegre (Unicamp, Brazil)

Quantum communication networks rely on the efficient transfer of unknown input states over long distances, and quantum teleportation plays a crucial role in achieving this objective. In this presentation, we showcase a groundbreaking advancement in the field by demonstrating the quantum teleportation of a polarization-encoded optical input state onto the joint state of a pair of nanomechanical resonators. Our approach utilizes the power of dispersive optomechanical coupling to enable this faithful transfer. Furthermore, we explore the potential of dissipative optomechanical systems, which address the challenge posed by thermal phonons hindering optomechanical operations in the quantum regime. We present a remarkable dissipative optomechanical system operating in the sideband-resolved regime, boasting a two-order-of-magnitude increase in mechanical frequency and a tenfold rise in the dissipative optomechanical coupling rate compared to prior works. These achievements underscore the yet to be explore potential of dissipative coupling.

16:30 to 16:45 – TS-THU-02-02

“Towards SiNx High Frequency Optomechanics”

By Nick J. Schilder, Roberto O. Zurita, Cauê Moreno Kersul, Caique C. Rodrigues, and Thiago P. M. Alegre (Unicamp, Brazil)

Silicon nitride has emerged as a promising material for photonic integrated circuits. To design and optimize future silicon-nitride-based optomechanical devices, it is essential to fully understand the photoelastic tensor. We use microgear cavities designed by us and fabricated by Ligentec. By optical spectroscopy we characterize the optical response of the devices made in the silicon nitride foundry. As a future step, we will characterize the optomechanical coupling of the device. By comparing the experimental results with simulations, we aim to fully characterize the photoelastic tensor. We expect this work to be an important step towards SiNx based high frequency optomechanics.

16:45 to 17:00 – TS-THU-02-03

“Degenerate optical parametric oscillation enhancement via coupled mode dispersion in triple-state photonic molecules”

By Nathalia B Tomazio (USP, Brazil); Laís Fujii, Luca O. Trinchao, Eduardo S Gonçalves, Paulo Jarschel, Felipe G. S. Santos, Thiago P. M. Alegre and Felippe Alexandre Silva Barbosa (Unicamp, Brazil)

We demonstrate degenerate optical parametric oscillation (DOPO) in the coupled modes of a triple-state silicon nitride photonic molecule. Our results show that DOPO with a contrast of 17 dB with respect to the pump fields can be achieved by fine-tuning the dispersion of the coupled modes to the normal regime with the aid of integrated microheaters.

Auditorium 2

14:00 to 15:30

Technical Session TS-THU-03 – Optical Communication 3

Chair: Alexandre Pohl (UTFPR, Brazil)

14:00 to 14:30 - TS-THU-03-01

Invited: “Optical Networks Perspectives to Support Future Connectivity”

By Rafael Figueiredo (CPqD, Brazil); Tiago Sutili (CPqD & Unicamp, Brazil); Júlia Aline Sousa Maciel and Fuad M Abinader, Jr and Joao B Rosolem (CPqD, Brazil); Luis Gustavo Riveros (CPqD & Unicamp, Brazil); Luciano Martins and Gustavo Correa (CPqD, Brazil)

The evolution of optical networks, with a focus on supporting next-generation connectivity solutions, is driving the development of technological solutions aimed at reducing capital and operational expenditures and energy consumption while increasing capacity, reach, and information security in optical transmissions. Within this context, this paper addresses recent developments and trends in coherent systems, optical amplification, integrated photonics, software-defined networking, and the use of quantum-based cryptography, which are highlighted across various scenarios, including transport, data center interconnects, access, and mobile xHaul.

14:30 to 14:45 – TS-THU-03-02

“Enhancing the Performance of Optical Networks with Route Segmentation and Fiber Augmentation”

By Felipe Augusto Tavares and Luiz H Bonani (UFABC, Brazil); Eric Fagotto (PUCCampinas, Brazil); Sandro M. Rossi (CPqD, Brazil); Marcelo Abbade (Unesp, Brazil)

In this paper, we propose and evaluate a scheme to enhance the performance of optical networks using route segmentation (RS) limited to modulation format maximum range. We have performed this study with an incremental traffic model considering the densely-connected CORONET topology taking the C-band and C+L-bands, with and without the adoption of fiber augmentation (FA). The results show that this strategy can be an interesting way to improve network performance regarding blocking and bit rates.

14:45 to 15:00 – TS-THU-03-03

“Sensitivity Analysis of Neural Network Hyperparameters for Chromatic Dispersion Compensation in Optical Transmissions”

By Fernanda Chaves (CPQD & Unicamp); Eduardo Rosa (CPqD, Brazil); Tiago Sutili (CPQD & Unicamp, Brazil); Rafael C. Figueiredo (CPQD, Brazil)

To verify and validate the use of machine learning techniques for chromatic dispersion compensation, we developed an end-to-end recurrent neural network (RNN) to replace the digital signal processing (DSP) blocks used in optical transmission and reception. We also evaluated the sensitivity of the developed networks to certain hyperparameters. Our analysis indicated that the number of neurons and the number of epochs were the most impactful parameters, and we also observed that using lower values for these parameters resulted in performance that was closer to that of a conventional DSP implementation.

15:00 to 15:15 – TS-THU-03-04

“Experimental Study of a MISO-VLC using two LED Luminaires”

by David Esteban Farfán-Guillén, Luis C. Vieira and Alexandre Pohl, UTFPR, Brazil)

In this work, the multiple-input, single-output (MISO) technique is implemented with OFDM modulation and the variation of the cyclic prefix (CP) is used to optimize the performance of an indoor VLC link, while maintaining the lighting conditions within the recommended levels (300-500 lux). Results show that by increasing the number of luminaires and by selecting the appropriate value of the OFDM cyclic prefix, the system's bit error rate (BER ≤ 10−3) is improved.

15:15 to 15:30 – TS-THU-03-05

“Impact of Noise in Continuous Pump Profiles on Distributed Raman Amplifiers for C+L Systems”

By Carine Mineto and Luis Gustavo Riveros (CPQD & Unicamp, Brazil); Fábio D. Simões (CPqD, Brazil); Tiago Sutili (CPQD & Unicamp, Brazil); Rafael C. Figueiredo (CPQD, Brazil); Evandro Conforti (Unicamp, Brazil)

The impact of noise in the pump profile of distributed Raman amplifier (DRA) for extended bandwidth transmissions is investigated. Specifically, a continuous pump generated by a shaped amplified spontaneous emission signal is employed to fit the DRA gain profile to a predefined target. The analysis is performed by comparing the power profiles obtained by the artificial neural networks (ANN) and by conventional numerical models for the Raman amplification process, resulting in errors below 0.5 dB.

15:30 to 16:00 - Coffee Break

16:00 to 17:30

Technical Session TS-THU-04 Optical Communication 4

Chair: Rafael Figueiredo (CPQD,Brazil)

16:00 to 17:30 - TS-THU-04-01

Tutorial:” Optical Communications - from Mb/s to Tb/s”

By Felipe Rudge Barbosa (Unicamp, Brazil)

The amazing evolution of Optical Communication Systems – from components and sub-systems to whole WDM networks -- will be presented. In its 50 years of existence capacity of transmission has evolved from Mb/s to aggregates of over Tb/s, spanning thousands of kilometers worldwide. All this has been possible through the creative evolution of Photonic Technologies, combining optoelectronic components with optical systems and electronic interfaces. Details of wavelength division multiplexing (WDM), optoelectronic technologies (lasers; detectors), sophisticated photonic equipment (such as reconfigurable ROADM) and submarine high-capacity links, will be discussed.

Auditorium 3

14:00 to 15:30

Technical Session TS-THU-05 – Sensors, Image and Illumination 3

Chair: Joaquim Martins Filho (UFPE, Brazil)

14:00 to 14:30 - TS-THU-05-01

Invited: “Distributed Optical Fiber Sensing”

By Cícero Martelli (UTFPR, Brazil)

This talk discusses the capabilities of a Sagnac Interferometer-based Distributed Optical Fiber Sensor (DOFS) system which, in comparison with conventional amplitude-based Distributed Acoustic Sensing (DAS) system, arises as a promising and rather accessible topology for a practical implementation.

14:30 to 14:45 – TS-THU-05-02

“Improving the sensitivity of lateral-mode bimodal waveguide interferometric biosensors”

By Daniel F. Londono-Giraldo and Christiano de Matos (Universidade Presbiteriana Mackenzie, Brazil)

Vertical-mode bimodal waveguides are challenging to fabricate in certain materials, such as silicon nitride. However, they provide an inherently better sensitivity compared to lateral-mode rectangular bimodal waveguides. We propose an `inverted T' core structure, which improves the sensitivity of lateral-mode waveguides. This design uses a thicker core at the center, to better confine the fundamental mode, and a thinner core at the edges to increase exposure of the second-order mode to the analyze.

14:45 to 15:00 – TS-THU-05-03

“Effect of Metal Oxide Layers on the Performance of Polymer Optical Fiber-based Hydrogen Sulfide Sensors”

By Juan D Lopez (UFRJ, Brazil); Alex Dante (UFRJ, Brazil & International Iberian Nanotechnology Laboratory (INL), Portugal); Regina Allil (UFRJ, Brazil); Ignacio Del Villar (Public University of Navarre, Spain); Ignacio R. Matias (Universidad Pública de Navarra, Spain); Marcelo Werneck (UFRJ, Brazil)

This work presents the development of polymer optical fiber (POF) sensors for hydrogen sulfide (h3S) detection, coated with varying numbers of metal oxide layers. Four sensors with identical structures were fabricated, and their performance was evaluated when exposed to 200 ppm of h3S. Increasing the number of metal oxide layers led to a sensitivity enhancement, up to 8 times greater with 21 layers compared to 3 layers. However, sensitivity decreased with more than 21 layers. These findings highlight the importance of optimizing the number of layers to achieve the best performance of an h3S sensor.

15:00 to 15:15 – TS-THU-05-04

“Curvature sensing with a hybrid-lattice hollow-core photonic crystal fiber”

By André D. P. Souza and Cristiano MB Cordeiro (Unicamp, Brazil); Foued Amrani (University of Limoges, France); Frédéric Delahaye (Glophotonics, Brazil); Frédéric Gérôme and Fetah Benabid (University of Limoges, France); Jonas H Osório (Unicamp, Brazil)

We report on curvature sensing measurements using a hybrid Kagome-tubular hollow-core photonic crystal fiber. The sensing principle is based on bending-mediated resonant couplings between core and airy cladding modes achieved at specific curvature radii and wavelengths. We consider that our investigation identifies a promising use of hollow-core fibers in sensing, thus broadening the application framework of this family of fibers.

15:15 to 15:30 – TS-THU-05-05

“D-shaped Plastic Optical Fiber Sensor for Detection of Ethanol Fuel Adulteration”

By Thales H. Castro de Barros (UFPE, Brazil); Henrique Patriota Alves (UFRPE, Brazil); Hebio Oliveira and Joaquim F. Martins-Filho (UFPE, Brazil)

Modern society, increasingly concerned about all the environmental impacts related to the production and use of petroleum-derived fuels, has sought alternative solutions to mitigate these impacts. From this context, ethanol produced from plants such as sugarcane is an important alternative to petroleum-derived fuels and research on production improvement, quality control and other related topics are common in the literature. This work proposes a device based on D-shaped plastic optical fiber to measure the water content mixed into ethanol. This measure is an important quality parameter to guide production and a common way to evaluate any possible adulteration.

15:30 to 16:00 - Coffee Break

16:00 to 17:15

Technical Session TS-THU-06 – Optics and Instrumentation 3

Chair: Claudio C. Motta (USP, Brazil)

16:00 to 16:30 - TS-THU-06-01

Invited: “Camera calibration for satellites and other embedded cameras”

By Álvaro José Damião (IEAv/CTA, Brazil)

The presentation covers visible and infrared camera calibration in situ, mainly the spatial calibration for satellites and other airplane-embedded cameras. The Modulation Transfer Function (MTF) is one of the figures of merit to characterize an electro-optical sensor and is related to the Spatial Frequency Response (SFR). In this work, the MTF was obtained by the Slanted Edge Method (SEM). The MTF and other camera parameters allow for obtaining the spatial resolution and quality of equipment distance performance. Those are essential for Search and Rescue operations.

16:30 to 16:45 – TS-THU-06-02

“Comparison of Scalar and Vector Vortex Beams for Turbulence-Immune Applications”

By Ramzil Galiev, Ravi K. Saripalli, Juan Coronel, Chaouki Kasmi and Steevy Joyce Cordette (Technology Innovation Institute, United Arab Emirates)

We study the propagation properties of scalar and vector vortex beams through a turbulent atmosphere. The irradiance beam profile, scintillation index and crosstalk are computed for different propagation distances in atmosphere with weak and strong turbulences. We also implement a neural network for a classification task to determine the number of topological charges of the scalar and vector vortex beams.

16:45 to 17:00 – TS-THU-06-03

“Progress towards a dual-comb spectrometer based on diode-pumped ErYb: glass lasers”

By Flavio Cruz (Unicamp, Brazil); Jonathas Siqueira (Unicamp - IFGW, Brazil); Antonio Saldanio Matos Macedo (Unicamp, Brazil)

We report our ongoing work on implementing dual-comb spectrometers in the near- and far-infrared (Tehahertz). They are based on two diode-pumped 500 MHz ErYb: glass femtosecond lasers at 1555 nm, whose pulses are amplified and compressed using all PM-fibers.

17:00 to 17:15 – TS-THU-06-04

“Thermophoretic efficiency in the MCVD process: A CFD modeling”

By Rubens Cavalcante da Silva, Paulo Jorge de Morais, and A. Carvalho (USP, Brazil); Wagner de Rossi (IPEN, Brazil); Claudio C. Motta (USP, Brazil)

The thermophoretic efficiency in the modified chemical vapour deposition (MCVD) process has been numerically determined under specified conditions of temperature and velocity field in the silica deposition tube. A CFD code was used to solve a steady-state numerical model of the MCVD process. The cumulative efficiency of SiO2 and GeO2 deposition was calculated along the tube length, yielding to a maximum value of 42% and 37% respectivelly.

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