Sponsors

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October 13th, 2022

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SponsorsThursday, October 13th 2022
Plenaries 1

Auditorium, 9:15 – 12:15

Chairs:Carmelo Bastos Filho andAnderson S. L. Gomes

9:15

Opening Ceremony

9:30

The world of optical solitons in ultrafast fiber lasers (Philippe Grelu): I will
provide a short introduction about the milestones that led to thegeneralized use of fiber lasers, from the research lab to the industry. Then,
I will focus on the generation of short and ultrashort pulses from fiber
lasers. The fiber cavity medium involves in general a substantial
participation of nonlinear and dispersive effects. That is why soliton
concepts have always been closely related to mode-locked fiber laser
operation. I will show how the goings and comings between experiments
and theoretical considerations have made these concepts evolve, toward
the generalized notion of a dissipative soliton, which made scientists movebeyond conventional laser stereotypes. I will illustrate how the fiber laser
platform allows us to experiment vivid signatures of the complex nonlinear
dynamics of temporal solitons, such as soliton molecules and complexes,
which turn out to manifest some analogies with their matter molecule
counterparts.
Metal-Nanostructures for Nonlinear Photonics (Cid Bartolomeu deAraújo): Nonlinear optical experiments with metal-nanoparticles andmetal-nanoclusters hosted in liquids and glasses will be reported. The
metal-dielectric nanocomposites were produced by selecting thenanostructures compositions, shapes, densities, and spatial arrangements,
as well as by choosing appropriate hosts. Optical nonlinearities beyond thethird-order were observed and characterized. The stable propagation of
spatial-solitons was studied along with the guiding of gaussian light beams
using optical vortices. A procedure for optimization of all-optical switches,
the upgraded operation of optical amplifiers in the shortwave infrared
region (SWIR), the optical modulation based on the dynamic control of gold
nanorods driven by an external electric field, and the study of the nonlinear
behavior of a metal-metasurface in the SWIR, will be described to illustrate
proof-of-principle applications of nanocomposites.
Understanding the optics of the retina and photoreceptors with ballistic
photons (Brian Vohnsen): The photoreceptors of the retina are highly
directional in their sensitivity to light. This shows in visual optics via theclassical Stiles-Crawford effect of the first kind and in retinal imaging by

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Thursday, October 13th 2022
highly directional backscattering of light. In this contribution we review our
work on understanding the optics of the photoreceptors in both healthyeyes and in eyes affected by retinal degenerations combining
psychophysical optics measurements with optical imaging and eyemodelling. Finally, we discuss how the optics principles may be involved in
the process of emmetropization that hinders myopia onset and in detecting
the sign of defocus in the process of accommodation and on how theknowledge gained may be used in the development of new ophthalmic
lenses.

Optical Communication 1

Auditorium, 14:00 – 15:30

Chair:

Joaquim Ferreira Martins Filho

14:00(Invited) Wideband Amplification for the Next Generation of Optical
Transport Networks (Marcionilo José da Silva): The data transmission overoptical channels in wideband systems is an important alternative toincrease the capacity of the current optical transport networks without asignificant increase in implementation and operational costs. However, toallow these systems to achieve long-reach transmissions, the developmentof appropriate optical amplifiers to provide high gain with low noise
insertion in each new optical band to be explored is a crucial step. This work
briefly describes the main technological alternatives with suitableperformance and complexity for high-capacity optical links in the extended
C+L band, including fiber-doped, Raman-based, and semiconductor opticalamplifiers. The amplifiers’ characteristics, most common use cases, designand optimization methodology based on Artificial Intelligence techniques,as well implementation and commercial challenges are discussed in thispaper.
Routing Traffic Distribution and the Performance Correspondence for
Optical Networks (Kelly Costa Fábio Della Nina and Luiz H. Bonani): In thisarticle, we analyze the performance of optical networks according to somescenarios of routing traffic distribution that include a strategy based on the
population served by the network nodes. Blocking probability and theaverage utilization are evaluated for the National Science Foundation(NSFNET) and the Pan-European (PANEUR) topologies. Moreover, statistics
on the routing traffic distribution are achieved and discussed to establish acorrespondence between the characteristics of routing traffic distribution
and the respective network performances.

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FE-OCDMA applied to C-RAN fronthaul in future mobile networks (Arthur
G Bueno and Andrea Chiuchiarelli): An optical access link, based on
Frequency Encoding Orthogonal Code Division Multiple Access (FE-OCDMA)for mitigation of Rayleigh backscattering crosstalk, is presented andanalyzed. The proposed system supports up to 7 users, all sharing the same
optical wavelength through a bidirectional fiber, allowing for full-duplex
transmission. Results show that FE-OCDMA coding shows higher resilience
to optical crosstalk compared to uncoded NRZ-OOK, allowing a data rate
per user of 1 Gbps with BER lower than 10−3 at 7 dB signal-to-crosstalkratio.
Estimating Amplifier Cascade Output Signal Using an Artificial Neural
Network and Considering Tilted Signals (José C. Pinheiro, Erick A. Barboza,
Marcionilo José da Silva, Carmelo Bastos-Filho, Joaquim F. Martins-Filho):
We adapt and optimize an output power estimator based on an artificial
neural network (ANN) to work in a scenario with multiple amplifiers(cascade). The optimization is made considering the ANN number of hidden
layers and the number of neurons in these layers. The optimized ANN isapplied in three link scenarios with a different number of amplifiers anddifferent power tilt profiles. Results show that the model achieved less than
2.5 dB of absolute error median considering the scenario with 20 amplifiers
and the worst power tilt profile.

Optics and Instrumentation

Room 2, 14:00 – 15:30

Chair:

Marcio Miranda

14:00(Invited) Scattering evaluation in nanoparticle liquid suspensions using Zscan-thermal-lens configuration (Georges Boudebs): The understanding of
nanoparticles scattering is very important, especially for the medical area
where the majority of imaging techniques and photothermal therapeutic
applications are subject to this phenomenon. Also, distinguishing thermallens effect from electronic third-order nonlinear response could help tobetter understand fundamental physics. In this talk, the main
characteristics of the thermal lens effect is studied as a time-resolved Z-scanconfiguration using cw-single Gaussian beam. We will focus on theevaluation of the measurement error from statistical calculations also tocheck the linearity of the response and the way to extract the thermooptical characteristics of different absorbing liquids. The results will be5Thursday, October 13th 2022

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applied to demonstrate the feasibility of absorption and scattering
efficiencies determination on gold nanoparticles of 5 and 50 nm diameters.
Anomalous diffusion on a two-particle quantum walk (Rodrigo Barbosa,Igor de Oliveira, Pedro de Figueirêdo and José Ferraz: In this work, wetheoretically investigate a one-dimensional bosonic and fermionic discrete
quantum walk, affected by a temporal disorder. Specifically, we study how
the wave-function symmetry and the phase disorder distribution affect the
final coincidence probability and transport properties of a 100-step
quantum walk. The degree of randomness is suitably adjusted by thedisorder distribution width and different diffusion exponents of quantum
state regimes are achieved, ranging from the classical diffusion ones to theballistic propagation.
Chemical sample classification using autoencoder-based spectroscopy(José Paulo G. de Oliveira, Carmelo Bastos-Filho, Sergio C. Oliveira): We
present a Proof of Concept of a chemical sample classifier. Instead ofspectrometer, we use autoencoders, which are machine learning models
that try to reconstruct at their output images presented at their input. The
autoencoder is trained with spectrograms generated from optical signals
detected after propagating through the sample. The signal shape is
specifically designed and the emitted wavelength varies as a function oftime. Over propagation through the sample, the signal is partially absorbed.
Since absorption depends on sample's transmittance, the detected signal
represents a signature. Hence, based on reconstruction error, theautoencoder performs classification with 100% accuracy.
Characterization of nonlinear optical constants in turbid media using theScattered Light Imaging Method (Kelly Jorge, Anderson M. Amaral, Albert
Reyna, Cid Araujo and Leonardo Menezes: Scattering is an intrinsic
characteristic of several relevant media, as biological materials or theatmosphere. While the retrieval of nonlinear optical constants inside suchmedia is challenging, the Scattered Light Imaging Method has been recently
proposed as a tool to characterize the nonlinear optical constants using
single laser shots. Theoretical and experimental results show that the SLIM
signal can not only determine the optical constants, but it is also able todistinguish nonlinear absorption from elastic nonlinear scattering (an often
ignored phenomenon). The present discussion shall be particularly relevant
for biological samples or colloids containing metallic or high-index
materials.

6Thursday, October 13th 2022
Nanophotonics and Plasmonics 1

Room 3, 14:00 – 15:30

Chair:

Luis Arturo Gómez Malagón

14:00(Invited) Illuminating materials: The materials science of light emitting
diodes (Rachel Oliver): About a quarter of the electricity generated
worldwide is used for lighting. Energy efficient light bulbs based on lightemitting diodes (LEDs) are about five times more efficient than traditional
incandescent bulbs, and hence have the potential to allow enormous
energy savings. The key material used in LEDs which emit white light isgallium nitride, a human-made compound, which has never been observed
to occur in nature. Optimising this new material to make LEDs which are
efficient, long-lived and reasonably affordable has been a huge challenge,
and despite the undoubted commercial success of these devices many
aspects of their operation remain mysterious. Materials scientists can takeLEDs apart, literally atom by atom, to understand their structure and how
this controls their properties. The relevant techniques emerged fromtraditional metallurgy, but are now being used to understand materials for
cutting edge optoelectronic devices, illustrating how the basic principles ofmaterials science are vital to the development of the technologies oftomorrow.
Solar Harvesting Application with Gold Nanospheres: the Influence ofParticle Size (Túlio L. Pedrosa, Caio V. P. Vital, Diego Rativa, Luis Malagon
and Renato Evangelista de Araujo:
Plasmonic nanoparticles havebeen applied to solar energy harvesting devices to improve theirperformance. In this work, we propose to evaluate the effects of gold
nanosphere size on solar harvesting for thermal applications. The
nanoparticle absorption spectrum is obtained using Mie Theory, and thespectral match with the sun is evaluated. Moreover, the temperature
variation in the particle neighborhood is analyzed. Results show that theamplitude of the absorption peak decreases with size, but its broadness
increases. Furthermore, the dimensions of nanospheres that maximize
solar energy absorption and temperature increase in the surroundings ofnanoparticles are determined.
Aminolevulinic acid-based metallic nanoparticles: Applications inAgriculture (Isabela Lopes, Marcia Franzolin, Susana Barreto, Carla Lopes
and Lilia Courrol): Aminolevulinic acid is a plant growth regulator andessential precursor for chlorophyll biosynthesis; besides, its photodynamic
activity can be used to exterminate microorganisms in plants and soil. In

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this study, silver and gold nanoparticles capped with aminolevulinic acid
(ALANPs) were synthesized by the photoreduction method andcharacterized by UV-Vis, transmission electron microscopy, and Zeta
potential. The effect of ALANPs was evaluated on stalks of E. densa bymeasuring the fluorescence of chlorophyll extracted from the plants after
incubation with nanoparticles. The antimicrobial activities were obtained.
The results suggested that ALANPs could be suitable for applications as
nanopesticides and nanostimulants simultaneously.
Study of Interferents of a Plasmonic Sensor for Uremic Toxins (Elberth
Manfron Schiefer, Andressa Santos, Marcia Muller,Andréa Stinghen,
Lucas H Negri and José L Fabris: This work shows the selectivity of acolorimetric sensor based on albumin bound to citrate-capped silver
nanoparticles. The sensor capability of quantifying protein-bound uremic
toxins, such as indoxyl sulfate, and uremic toxins that do not bind toproteins, such as creatinine and urea, is demonstrated. Furthermore,
optimal sensor outputs were obtained independently of the silver
nanoparticles concentration, indicating that smaller nanoparticles are
possibly responsible for the sensing of below-uremic concentrations of
uremic toxins.

Lasers 1

Auditorium, 16:00 – 17:50

Chair:

Carlos Jacinto

16:00(Invited) Flexible, Stretachable, Plasmonically Enhanced Random Lasers
and Random Fiber Lasers (Anderson S. L. Gomes): Random Lasers (RLs) andRandom Fiber Lasers (RFLs) are coherent optical sources whose opticalfeedback mechanism to sustain oscillation in the gain material comes fromscattering in a disordered media, rather than from two static mirrors. Even
though they are cavityless, they are not modeless, and generally behave as
multimode lasers. The subject was first theoretically introduced in 1967, hasbeen recently reviewed. In this talk, I will briefly review the state-of-the-art
in RLs and RFLs and focus on one of the main advantages of this photonic
device, which is their ability to be flexible and stretchable, yet emitting
coherent radiation, besides being able to take advantage of plasmonicenhancement due to its interaction with metallic materials. Examples forbiomaterials host for RLs will be emphasized.

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Numerical solution of atmospheric laser beam propagation using artificial
compressibility and pseudo-spectral methods (Paulo Jorge de Morais and
Rubens Cavalcante da Silva, Wagner de Rossi and Claudio C. Motta): In
order to analyze the thermal blooming on wireless power transmission andremote recharge of batteries this study proposes a coupled numericalsolution. The Navier-Stokes, Energy and Paraxial equations to a laser beam
propagation through the atmosphere are solved by artificial compressibility
and pseudo-spectral methods. Changes in refractive index due toasymmetric temperature variations are the cause of this opticalphenomenon. Numerical results are compared with reference studies andgood agreement is obtained. The conditions: laser beam, power density andabsorptivity are constants; flow regime of Re=1000, Ri=10.e (4), laser
wavenumber k=10.e(5), and Stanton number St=1/30.
Solution of an YDFA in Tandem-Pumping configuration with ASE using theRK4 method (Pedro Bernardo S. Melo, Ricardo E. Samad and Claudio C.
Motta: The formulation of a tandem amplifier using a 30/250 µm doped
fiber was improved by the use of the rate equations solution for theamplification of the spontaneous emissions in these multikilowatt systems.
The model precisely describes the behavior of a fiber amplifier with a
5986kW, 1018nm pumping, and a signal seed of 75W at 1080nm, and solves
the propagation and rate equations using the fourth-order Runge-Kutta
method, also using the relaxation method as a convergence criterion for the
integrations.
Ultrafast laser micromachining of submillimetric de Laval nozzles inalumina for laser electron acceleration (Armando V. F. Zuffi, Fabio
Tabacow, Nilson Vieira and Ricardo E. Samad): We have explored thefabrication of submillimetric de Laval nozzles by ultrashort laser pulses
micromachining in alumina, a dielectric ceramic, to generate supersonic gas
jets in vacuum. The nozzles were manufactured in a home-built trepanning
setup, and their geometry and surface quality dependence on the laser andmachining parameters was investigated, aiming to control the jet spatial
density to produce optimal gaseous targets for laser electron acceleration.
(Technical Talk) Sensores FBG em aplicações de SHM - Structural Health
Monitoring (Danilo Ginez, Hottinger Brüel and Kjær A/S)

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Thursday, October 13th 2022
Integrated Photonics 1

Room 2, 16:00 – 17:50

Chair:

Cid. B. de Araújo

16:00

A Finite-Difference Time-Domain analysis of Fiber Bragg Gratings (Davi P.
Nacaratti, Ricardo E. Samad and Claudio C. Motta): An analyticalformulation and modeling of optical fiber Bragg gratings has beendeveloped, and is reported in this paper. Supported by the Finite-Difference
Time-Domain (FDTD) method, it was possible to set a 1018nm Bragg grating
and simulate an electromagnetic field going through its periodic refractiveindex structure, obtaining its reflectivity, transmittivity, and bandwidth.
Moreover, the model was applied to analyze the influence of structuralparameters of fiber gratings, such as length, grating period and refractive
index modulation on its spectral response.
In this talk, we show a particular scatterometry technique, in which a
coherent light beam is focused by a lens on a surface to be inspected andthe scattered light is collected and detected in the far field. This technique
has been successfully used for characterization of nanostructures andcontamination detection for the semiconductor industry.
Fabrication of Rib Waveguides with 3D printing and their Characterization(Fábio G Borges and Bruno Denadai, Andréia Macedo, Juan Pérez, NeriVolpato and Alexandre Pohl): This work describes the fabrication of opticalrib waveguides with the Vat photopolymerization technique. Results ofsurface roughness and material absorption, which impact the quality of thefabricated structures are presented and discussed.
Role of the ZnO crystallinity on the Er3+ Optical Emissions (Camila IanhezPereira, Marcio Godoy and Ariano Rodrigues): We report on thecorrelations between optical emissions of Er3+ and structural properties of
ZnO host thin films. The films were deposited by spray pyrolysis using highand low precursor dilution (molarity) conditions, which influence the crystal
order. Structural and optical measurements correlate the use of a lower
molarity with a transparent film texturized in c-axis and strong Stark effectin infrared emission. In contrast, emissions in visible range are present onlyin high molarity film.
Spatial coherence mapping using NV centers in diamond (Lucas N. S. de
Andrade, Charlie O. Oncebay Segura and Sergio R. Muniz): The nitrogenvacancy (NV ) centers in diamond became, in recent years, an excellent
solid-state spin system for quantum sensors due to their electronic spin
properties. Especially for their easy manipulation and optical initialization

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at room temperature. Works have reported its use as a sensor for
temperature, strain, electric fields, and mainly a sensor of magnetic fields.
This work demonstrates another use of NV centers, reconstructing a
coherence map using an engineered sample of ultra-pure diamond and a
CCD camera.
Numerical simulation on modified chemical vapor deposition (MCVD)
thermal flow field (Rubens Cavalcante da Silva and Paulo Jorge de Morais,
A Carvalho, Wagner de Rossi, and Claudio C. Motta): To modeling the SiCl4
oxidation reaction in the modified chemical vapor deposition (MCVD), thisstudy determines the hydrodynamic and thermal properties of flow fieldusing a CFD steady-state simulation. The Navier-Stokes, continuity, energy
and species equations were solved by the Finite Volume Method over acylindrical domain rotating at 45rpm, 24mm diameter and a flow regime of
Re=900. User defined functions were developed on STAR-CCM+ code tomodeling SiCl4 oxidation, which occurred in the zones with the highest
temperatures (1800K) determined by the torch heating profile. The
numerical results were compared with a reference study and good
agreement was obtained.

Sensors, Image and Illumination 1

Room 3, 16:00 – 17:50

Chair:

Eduardo Fontana

16:00(Invited) Optical and Fiber Optic Sensors – Theory and Applications(Marcelo Martins Werneck): Prepared by a top expert in the field, withmany developments, real applications and patents, this lecture will be aninvaluable resource for physicists, electronic engineers and will be well
accepted by teachers, students, technicians and those working in the sensor
area. This lecture discloses the advantages and capabilities of optical fiber
sensors in research and industry, including two technologies, the plastic
optical fiber (POF) and the silica fiber. Apart from presenting several
technologies applying the POF as a sensor, this tutorial will also deal withanother kind of technology, the Fiber Bragg Grating (FBG). FBGs can befound in many industrial applications and I will show our experience inapplying FBGs in many types of sensors for the electric energy industry. The
tutorial starts with the theory of optical fiber sensors applying both POF and
FBG. Then it focuses on several practical uses of sensors including successful
field applications designed by our laboratory in areas such as Oil & Gas,
Biotechnology and Electrical Energy. The following topics are presented and11Thursday, October 13th 2022

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discussed throughout the lecture: Optical Fiber Sensors technologies;
Temperature Sensing; Strain & Force Sensing; Refractive Index Sensing;High voltage switch monitoring; Current & Voltage Sensing; Gas Sensing;
Chemical & Biological Sensing; Oil Leaking Sensing; High voltage and highcurrent measurements; Gas flow velocity measurements.
Application of optical microsphere in fiber optic sensors for measurementof electrochemical processes: Paulina Listewnik): Examination of chemical
phenomena is crucial in sensing and detection of bisphenol A in waste. In
this paper, the investigation of the electrochemical processes using microsphere fiber-optic sensor with a zinc oxide (ZnO) coating applied by Atomic
Layer Deposition method (ALD) is presented. To perform themeasurements, a three electrode setup was used. During the process, thedecomposition of a bisphenol A solution in 1M KNO3 was observed.
Computational Modeling of D-shaped Optical Fiber Nitrate and Sulfate
Sensor (Thales H. Castro de Barros, Henrique Patriota Alves, Renato
Evangelista de Araujo and Joaquim F. Martins-Filho: Sulfates and nitrates
are ions that are present in many important chemical processes such as the
manufacture of fertilizers. This work proposes the use of single-mode Dshaped optical fiber (SMF-D) as an optical sensor platform to measure theconcentration of these ions. Computational modeling, exploring the finite
element method, was explored in the evaluation of the fiber sensor
performance, considering ammonium nitrate and ammonium sulfate, with
10%, 25% and 40% concentrations, in water solution. The proposed opticalsensor presents a sensitivity of 0.0016 dB/% for ammonium nitratesolutions and 0.00151 dB/% for ammonium sulfate solutions.
Polarizing fiber temperature sensor powered remotely by circularly
polarized light (Martin Kyselak, David Grenar, Jiri Vavra, Zdenek Vylezich
and Karel Slavicek: From their conception, optical fibers have been
primarily used in telecommunications technology to transmit data using
non-polarized light. Nowadays, however, the development of fibers has
advanced considerably and new applications have been discovered. One
application is utilizing optical fibers as sensors, predominantly polarizing
fiber sensors working with polarization-preserving fibers. Their use thus
extends to the temperature/pressure sensor used in this work. This article
deals with the issue of temperature measurement using a single-mode
sensory polarization maintaining fiber. Since this fiber is not circularly
symmetrical, or rather, the stress elements inserted into this fiber are
utilized, birefringence occurs in its core.

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Hollow-core fibers for curvature sensing (Jonas H Osório, William M
Guimarães, Marcos A. R. Franco and Cristiano MB Cordeiro: We develop
on an approach for assessing curvature variations by using hollow-core
photonic crystal fibers. The sensing method described herein relies on an
azimuthally asymmetric tubular-lattice hollow fiber and explores the bendinduced spectral shifts of the cladding tubes' resonances. By numericallyanalyzing the transmission properties of such fiber architecture, we showthat this platform can detect both curvature magnitude and angle. We
understand that this study widens the framework for hollow-core fibers
applications within the sensing scenario.

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Friday,
October 14th, 2022

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Sponsors

Friday, October 14th 2022
Plenaries 2

Auditorium, 9:00 – 12:30

Chairs:Diego Rativa and Renato E. de Araujo

9:00

Microwave Photonics and Application to 6G systems (Arismar Cerqueira
Sodré Junior): This seminar is going to concisely and comprehensively
covers all-important aspects of diverse 5G optical-wireless communications(OWC), including the fundamentals and state-of-the-art of free space
optical (FSO), visible light communication (VLC) and radio over fiber (RoF).
Moreover, implementations of 5G New Radio (5G-NR) Fiber/Wireless (FiWi)
systems based on FSO, VLC, RoF and power over fiber (PoF) towards thesixth generation of mobile networks (6G) are going to be reported into
details. Deployments of 5G-NR FiWi systems operating in the 26 GHz
frequency band at dozens of Gb/s throughput, as well as the concept andimplementation of machine learning (ML)-based pre- and post-distortion
schemes for RoF systems are going to be demonstrated and properly
discussed. All OWC experiments have been carried at the Laboratory WOCA
(Wireless and Optical Convergent Access) from Inatel in the city of Santa
Rita do Sapucaí-MG, Brazil.
Exploring spontaneous emission for building up global quantum networks(Daniel Felinto): The quantum internet is emerging as an extension of the
protocols for quantum communication, incorporating local processing of
information together with distribution of quantum entanglement among
multiple sites. Even though quantum communication initially developedwith a focus on local networks, in the last years large steps were given in
the distribution of quantum entanglement through sattelites, stablishing
the first quantum networks of truly global reach. Behind this trajectory oftechnological development, there has been also conceptual developmentsin the last decades about the ubiquitous nature of quantum entanglement
and its presence in various natural phenomena routinely occurring aroundus. Here I will discuss this arch of ideas that goes from the observation ofquantum entanglement is ever simpler phenomena, up to its control andapplication in quantum communication of growing distance and complexity.
I will focus on the work of our group and in the recent perspectives ofintegrating this work in the global effort to develop technologies for aquantum internet.

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Status of Luminescence Nanothermometers for Biomedicine (Carlos
Jacinto da Silva): In recent years, there has been an increasing interest in
luminescent nanoparticles (LNPs) as biocompatible optical probes fordiagnostic, therapy and fluorescent probes. Special attention has been
given to the use of nanoparticles as luminescent nanothermometers(LNThs) because the temperature is a fundamental parameter in a varietyof areas. In biomedicine, for example, the temperature is one of the mostcritical parameters affecting the dynamics of living specimens due to thestrong temperature dependence of cellular dynamics, since abnormal
temperatures could induce irreversible effects. Furthermore, small
temperature anomalies could indicate many diseases or health dysfunctions
such as tumors, inflammation, so on. Therefore, the local temperaturemonitoring can be used as an effective early detection procedure and fortherapy as well. Unfortunately, recent results have raised some concerns
about the reliability of “classical LNThs” due to the presence of nonnegligible tissue-induced spectral distortions. The scientific community is, infact, looking for a straightforward solution to this problem that would allow
continue to consider LNThs as a reliable and robust technique for
intratumoral thermal reading. In this talk, it will be presented in a wellsummarized form what has been done on fluorescence and thermal images
applied to biological systems.
From machine learning for photonics to photonics for machine learning infiber-based and integrated devices (Roberto Morandotti): AI and Machinelearning (ML) find increasing applications in the field of photonics. On one
hand, ML can assist photonics via the use of evolutive algorithms that canbe used to optimize the response of a given device or process. As an
example, the straight-forward on-chip design of an unbalanced MachZehnder interferometer cascade (UMIC) can be used for either customtailoring the spectrum of supercontinuum generation, or to perform
efficient pulse shaping in the (tens of) picosecond(s) regime via temporal
coherence synthesis. On the other hand, photonics can assist ML.
Specifically, artificial neural networks (ANNs) are capable to classify
different sets of data and are of significant interest for machine learning
tasks such as computer vision, speech recognition, playing board games andmedical diagnosis, to name only a few. Optical-based neural networks areespecially attractive as they have the capability to dramatically accelerate
the computing speed of ANNs and thus overcome the intrinsic bottleneck inbandwidth that currently limits the performance of electronics-based

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approaches. Furthermore, a specific class of ANNs, namely Convolutional
Neural Networks (CNNs), is capable to greatly reduce network complexity
without affecting the accuracy of the predictions by a fully connected
neuronal network. In this talk, I will give an overview of some of theseapproaches and will discuss both advantages and limitations.

Optical Communication 2

Auditorium, 14:10 – 15:30

Chair:

Daniel Augusto Ribeiro Chaves

14:10(Invited) Integrated photonics in access networks: the challenges (António
Teixeira): In this work we will address the specific field of access networks
and FTTH. The particularities of this field and context make alldevelopments more demanding. In one hand the players see theopportunities that this brings, like billions of subscribers eager for
bandwidth, and on the other the same see the challenge of thecost/maturity point that each service or interface has to reach in order beable to be mass deployed. These challenges will be addressed by comparing
the existing bulk approaches being partitioned today and how the
integrated photonics world is developing its ecosystem and techniques tosurpass the challenges.
Performance Evaluation of Elastic Optical Networks under Scenarios with
Unequal Distribution of Service Types per Route Length (Fábio Della Nina
and Kelly Costa and Luiz H Bonani): This paper addresses the problem ofheterogeneously distributed service types according to the route lengths
and the impact on the EON performance. Blocking probability in different
aspects of the network, such as network-related, inter-service, andconsidering specific route lengths, is evaluated according to a methodologythat changes the percentage of services in the routes with specific lengths,
keeping a fixed network load. A 4-node bidirectional ring topology is used
to present the methodology and evaluate the initial scenarios. However,this strategy can be generalized to other scenarios, standing as a helpful
tool to assess the coexistence of diverse modulation formats.
Design of a coherent optical receiver on a silicon nitride platform for mode
multiplexed systems (Ítalo Albuquerque Araújo, João Gadelha and Adolfo
Fernandes Herbster): Current coherent optical systems carry information
at high bit rates over long distances in single-mode optical fibers. However,expanding data traffic is increasingly demanding higher transmission rates
which could be employed by spatial mode multiplexing. In this work, an

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optical hybrid for C-band on a silicon nitride platform is proposed. The
hybrid is composed by a 2x2 and 1x2 multimode interferometers, and amode converter. Losses less than 0.5 dB and 0.75 dB for TE0 and TE1 modes
are achieved and common mode rejection ratio near 50 dB, and phase error
below 0.5°.
Theoretical Analysis of the Transmission Efficiency of a (6 + 1)×1 PumpSignal Combiner (Lucas Mendes, Ricardo E. Samad and Claudio C. Motta:
An analytical formulation for the transmission efficiency of a (6 + 1)×1
pump-signal combiner has been developed and is reported in this paper.
The formulation is supported by the Coupled Mode Theory (CMT), and the
Finite Difference Beam Propagation Method (FD-BPM). Within this scope,
the characteristics of the commercial fibers FG200AEA, GDF20/200, P20/400DC were considered for building a combiner computational model.
Thus, the CMT was used to estimate the adiabatic length of the input bundle
fibers, and the combiner efficiency was analyzed based on FD-BPM.

Optics and Instrumentation

Room 2, 14:00 – 15:30

Chair:

Marcelo Martins Werneck

14:00(Invited) Optical metrology of structures and surfaces (Silvania Pereira):
Optical scatterometry is a method that can be used for the characterizationof unknown properties of a medium by measuring some parameters orproperties of the scattered light, such as its intensity distribution,
polarization and coherence. The scattered field is usually detected orobserved at a distance of many wavelengths from the medium, in the socalled far field region. Far field detection is convenient in terms of dataacquisition, but the drawback is that, in the far field, high spatial frequency
information contained in the near field is lost. By measuring the scattered
far field one does not obtain a direct image, but instead by means of solving
an inverse electromagnetic model and taking a priori knowledge into
account, one can infer some parameters of interest of themedium/scatterer.
In this talk, we show a particular scatterometry technique, in which a
coherent light beam is focused by a lens on a surface to be inspected andthe scattered light is collected and detected in the far field. This technique
has been successfully used for characterization of nanostructures andcontamination detection for the semiconductor industry.

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14:30

14:50

15:10

Temperature artifacts on two-dimensional thermal imaging of
upconverting microcrystals via hyperspectral scanning (Jefferson Augustode Oliveira Galindo, Allison Pessoa, Anderson M Amaral, Leonardo
Menezes, Sidney JL Ribeiro and York Serge-Correales): Lanthanide-doped
upconverting particles are among the main subjects of interest forluminescence thermometry in micro/nanoscale. Despite their outstanding
performance, the investigation of spatially varying effects related tointernal dynamics and/or interaction with the surrounding medium is still achallenge. This work reports on thermal imaging measurements performed
through hyperspectral scanning technique on single NaYF4: Yb3+/Er3+
microparticles. The results show that the thermal response of the
microparticle depends on the laser incidence position, which may induce
temperature misreadings. Also, this work reports instrumental-related
thermal artifacts, suggesting important corrections for building spatiallyresolved thermal maps with direct implications on lanthanide-based
luminescent thermometry.
A Software-Based Lock-in Amplifier for Optical Spectroscopy Applications(Hugo A. Fonsêca, Ricardo Ataide Lima and Diego Rativa): This works
describes the development of a low computing software capable ofapplying the lock-in amplifier signal correlation technique. These amplifiers
can obtain the measured signal immersed in noise which has superior signal
amplitude. The software was developed in C#. The software is capable ofprocessing all 2050 points that compose the optical spectrum
simultaneously. Two performance tests were conducted to recover the
spectral profile of a yellow LED, submitted to two different emulated opticalnoises. Preliminary results show its efficacy and its viability of embed
platform prototyping, allowing the application of optical spectroscopy
techniques without needing external luminosity control.
LED-POF Compound as Current Sensor for High-Voltage Transmission
Lines (Marcelo Werneck, Paulo Henrique S Pinto and Renato Bellini, Juan
D Lopez and Regina Allil): Transmission line operators need to know theelectrical currents to control energy demands, excess heating, andimpulsive surges. Nevertheless, current transformers are bulk, heavy with alarge footprint, and difficult to install. We describe a high-voltage current
sensor applying a LED and a plastic optical fiber. This system was tested in
two applications: A current transformer for in-field surveys at 13.8 kV lines
and to measure leakage currents in insulators. The systems are portable,
cheap, and easy to install, presenting advantages: do not require

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energization, electromagnetic immunity, electrical isolation and thepossibility to install in live-line.

Nanophotonics and Plasmonics 2

Room 3, 14:00 – 15:30

Chair:

Albert Stevens Reyna Ocas

14:00

(Invited) Combining pulsed lasers and photothermal nanoparticles fordelivering functional molecules in living cells and beyond (Kevin
Braeckmans): Point of need testing has tremendous value in sensing(medical and non-medical) in resource-poor areas. The ideal point-of-need
device is a portable ‘sample-in-answer-out’ system, which requires
simplicity in operation. However, most sensing technologies require
quantitative, diagnostic-level performance, and necessitate specialized
instrumentation, limiting their use in point-of-need applications. To adapt
biosensors to resource-poor locations, device miniaturization for
portability, cost-effectiveness, and easy sample processing needs to beconsidered while maintaining their efficacy. Consequently, incorporating
photonic technologies into biosensing platforms is needed to address thisissue. I will present our work on integrating sample handling (themicrofluidic component), biosensor chemistry (the assay), and data
recording (the reader) into one single device. This approach leverages
recent developments in the semiconductor industry where CMOS devices
are manufactured at scale for low cost (<$1) and achieve high performancesuch as improved efficiency in converting photons to electrons (close to90%) for improved sensitivity, small pixel size (<1 micrometer) leading tohigh spatial resolution, and large active area (>3x2mm) to accommodate
several microfluidic channels.
Detection of Glyphosate in Water with Photonic-Tailored Silver
Nanoparticles (Lays C. Seixas Costa, Elberth Manfron Schiefer, José L Fabrisand Marcia Muller: This work describes an approach towards the detectionof glyphosate levels in liquid compatible with standards for drinking water.
Prismatic nanostructures were produced from spherical silver nanoparticles
by photoinduced shape conversion, leading to an enhanced interaction
between the nanoparticles and the analyte, inferred by both ultravioletvisible and surface enhanced Raman spectroscopy. The role of the silver
nanoparticles' shape and charge in the interaction with glyphosate wasinvestigated. SERS spectra revealed fingerprint bands that provide an
unambiguous identification of this herbicide. The obtained limit of

14:30

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15:10

detection was 0.11 mg/L, which is almost 8.2 times smaller than the healthbased reference value.
Selecting silver nanoshells for colorimetric sensors (Raphael
Baltar,Renato Evangelista de Araujo and Sajid Farooq: In this work the use ofsilver nanoshell as a starting point for the establishment of colorimetricsensor platforms, under solar illumination, was evaluated. Mie theory was
explored on the analysis of the nanosensor linearity and sensitivity,
considering 4 different color spaces and the influence of the nanoshellgeometry. A high performance plasmonic nanoplatform was identified. The
nanosensor platform based on nanoshells, with 35 nm SiO2 core radius and25 nm Ag shell thickness, showed sensitivity values up to 2.78/RIU andlinearity higher than 0.96, considering the Hue parameter of the HSV color
space. The identification of optimized plasmonic nanoplatforms may extend
the use naked-eye colorimetric applications in low-resource environments.
Effect of the addition of thermoxidized soybean oil on the fluorescence
spectra of silver nanoparticles synthesized with extract of Mimusops
coriacea (Carla Lopes and Lilia Courrol): Silver nanoparticles weresynthesized using the aqueous extract of Mimusops coriacea leaves. This
extract emits intense fluorescence at approximately 364, 450 and 510 nm
when excited at 280, 368 and 432 nm, respectively. After the formation of
the nanoparticles, there is a significant reduction in the emission intensity.
The addition of soybean oils heated at ~180 °C to the nanoparticles
increased the emission intensity, varying with the degree of oxidation of theoil. This result indicates the potential of developing a nanosensor todetermine the degree of thermoxidation of soybean oils.

Biophotonics

Auditorium, 16:00 – 17:50

Chair:

Renato E. de Araujo

16:00(Invited) Novel photonic technologies for biosensing at the point of need
(Sebastian Wachsmann-Hogiu): Intracellular delivery of bioactive
compounds, such as proteins and nucleic acids, into living cells is a genericrequirement for many applications in the life sciences. Although substantial
effort has gone into developing viral and non-viral nanocarriers, they eachcome with their limitations, including safety concerns and limited efficiency.
Physical delivery methods offer an interesting alternative solution.
Electroporation is a notable example but is often associated with high cell21

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16:50

toxicity. Laser technology combined with photothermal nanoparticles has
emerged as a promising intracellular delivery method combining highdelivery efficiency with flexibility and good cell viability. Cells are first
incubated with photothermal nanoparticles which are adsorbed to the cell
membrane. Local heating effects upon laser irradiation create pores in themembrane through which compounds in the surrounding cell medium canthen enter the cell. Using this so-called ‘photoporation’ technology, we
have demonstrated that many cell types can be efficiently transfected,
including primary neurons, macrophages and T-cells. Compounds that canbe delivered include nucleic acids (siRNA, mRNA, pDNA, …), proteins (e.g.
nano- and antibodies), gene editing complexes (e.g. CRISPR/Cas9) andcontrast agents (e.g. for MRI). Applications range from fundamental
biological investigations to the engineering of therapeutic cells for cellbased therapies. In addition, we have demonstrated that the same principle
can be used to disrupt bacterial biofilms or to destroy vision-impairing‘floaters’ in eyes in vivo. In summary, pulsed lasers and nanoparticles offers
the possibility to interfere with biological tissues in a highly controlledmanner, thus opening up unique biomedical applications with plenty ofroom for further exploration and development.
Identifying enamel demineralization using high performance
convolutional neural network (Amanda Caramel-Juvino, Sajid Farooq,
Mariana Romano and Denise M. Zezell): Here, we traces use segmentationand convolutional neural network (CNN) to to trace, diagnose and quantify
enamel demineralization for research. The preprocessing, histograms based
methods are used to enhance the contrast and equalize the brightness
through the scanning electron microscope images. Our result evidence thatthe deep learning based CNN model is highly efficient to process the dental
image to achieve high accuracy of enamel demineralization and presents
promising outcomes with optimal precision.
Correlation Between Human Skin Optical Properties and Colorimetry
Using Individual Typology Angle (Luismar Barbosa da Cruz Junior, Carlos
Eduardo Girasol, Pedro Coltro, Rinaldo Guirro and Luciano Bachmann):This work aims to correlate the human skin phototype through theindividual typology angle (ITA) values with the human skin opticalcharacterization (absorption and scattering coefficients) for different
phototypes. We used a colorimeter to group 10 fresh human skin samples
according to their phototype. This study demonstrates the importance ofconsidering skin colors in optical analysis but also takes into consideration

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17:30

an absolute quantitative metric to evaluate skin color. Melanin is a strong
modifier of optical properties and using the ITA quantitative analysis it ispossible to characterize its optical properties correlating with a nonsubjective color scale.
Superior Machine Learning Method for breast cancer cell lines
identification (Sajid Farooq, Amanda Caramel-Juvino, Matheus del Valle,
Sofia dos Santos, Emerson Bernardes and Denise M. Zezell: We propose
here an artificial intelligence platform based on machine learning (ML)algorithm using Neighborhood Component analysis and K-Nearest
Neighbors for breast cancer cell lines recognition. Our model presents up
to 97% accuracy for identification of breast can cell lines.
Aminolevulinic acid-based metallic nanoparticles: Applications inAgriculture (Isabela Lopes, Marcia Franzolin, Susana Barreto, Carla Lopes
and Lilia Courrol: Aminolevulinic acid is a plant growth regulator andessential precursor for chlorophyll biosynthesis; besides, its photodynamic
activity can be used to exterminate microorganisms in plants and soil. In
this study, silver and gold nanoparticles capped with aminolevulinic acid
(ALANPs) were synthesized by the photoreduction method andcharacterized by UV-Vis, transmission electron microscopy, and Zeta
potential. The effect of ALANPs was evaluated on stalks of E. densa bymeasuring the fluorescence of chlorophyll extracted from the plants after
incubation with nanoparticles. The antimicrobial activities were obtained.
The results suggested that ALANPs could be suitable for applications as
nanopesticides and nanostimulants simultaneously.

Lasers 2

Room 2, 16:10 – 17:50

Chair:

Marcio Miranda

16:10

Tunable diode laser surface plasmon spectroscopy (Gabriel F Fernandes,
Raoni F Gois, Ernande Melo and Eduardo Fontana): In this paper, we
propose use of temperature tuning of distributed feedback lasers inconjunction with metal coated diffraction gratings in the near infrared forinterrogation of the surface plasmon resonance spectrum, at a fixed angle.
The approach allows using traditional techniques for spectral analysis of the
SPR effect, such as wavelength modulation spectroscopy. Case studies are
simulated to demonstrate the feasibility of the approach, based on thermal
response curves of commercially available DFB lasers.

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Thermodynamic measurement of non-equilibrium stochastic processes in
optical tweezers (Thalyta T. Martins, Lucas Kamizaki and Sergio R. Muniz):Due to their versatility in investigating phenomena in microscopic scales,
optical tweezers have been an excellent platform for studying stochastic
thermodynamics. In this context, this work presents experimental
measurements of the energetic cost of driven finite-time protocols using
colloidal Brownian particles in harmonic potentials. For this simple model
system, there is an exact optimal solution. Our results compare the optimaland (sub-optimal) linear protocol for a time-dependent trap, controlling thetrap stiffness with different modulation amplitudes and protocol times. We
also calculate the Jarzynski relation for the stochastic trajectories as anindependent consistency check.
Power analysis of a microstructured vector light beam composed of acontinuous superposition of zeroth order ideal Bessel beams(Vinicius de Angelis and Leonardo Ambrosio): In this paper, wederive an expression for the power of a nondiffracting microstructured
vector light beam characterized by a continuous superposition of zerothorder ideal Bessel beams, known in the literature as Frozen Wave. Our final
result expresses the power in terms of the spectrum of the Frozen Wave inthe spatial frequency domain. The power evaluated from our final result isin accordance with that obtained by numerically integrating the averageenergy flux associated with the beam. Besides, our expression is lesscomputationally demanded, which facilitates the determination of the
optical forces produced by this vector light beam.
Numerical simulation tool and experimental set-up for measuring themodal structure of a broad area semiconductor laser diode (Fernando
Carlos Romano and Niklaus Wetter): A computer simulation model for asingle stripe, multimode laser diode of the type broad area semiconductor
diode (BALD) was built and compared to the transversal mode structure
measured in an experimental set-up as a function of the forward current in
its heterojunction. A set up was built with the objective of identifying thelateral modes by using the frequency beat technique in the RF spectrum. A
spectrum analyzer measured the signals emitted by the BALD using the fast
Fourier transform (FFT) method.
Technical Talk Reserved

24Friday, October 14th 2022
Sensors, Image and Illumination 2

Room 3, 16:00 – 17:30

Chair:

Brian Vohnsen

16:00(Invited) New-generation hollow-core photonic crystal fibers and theiroutstanding possibilities (Jonas H Osório): The recent breakthroughs in
hollow-core fiber technology have granted new enthusiasm to the fiber
optics community and consolidated this family of special optical fibers asbuilding blocks for the next developments in photonics. In this talk, we will
review the fundamentals of hollow-core fibers by delving into the lightguidance mechanisms, the different fiber architectures, and fabrication
methods. Moreover, we discuss the latest advances and the bright scenario
of hollow-core fibers applications ranging from beam delivery devices tosensing opportunities.
Analysis of 3-D waveguides in a cylindrical lens solar concentrator (Marcos
C. Ramos, Caio V. P. Vital, Hugo A. Fonsêca, Renato Evangelista de Araujo
and Diego Rativa): High-efficiency solar cells use waveguides forconcentration and greater capture of sunlight, reducing the physical area ofsolar panels and the cost of this technology. Therefore, this study intends
to simulate and analyze a solar concentrator that will consist of 3 cylindricallenses and 3 waveguides. The model simulation was performed using the
Comsol Multiphysics software. The results showed a maximum optical
efficiency of 77% and a concentration ratio approximately equal to 3.5. The
set of lenses and waveguides were developed in a unique structure. The
model demonstrates potential for photovoltaic and photothermal
applications from concentrated sunlight.
A study comparative between Magnetic Field Sensors Based on in-Fiber
Fabry-Pérot cavity Interferometer and on etched side-hole Fiber (Larissa
Beserra Soares, Juan D Lopez, Alex Dante, Regina Allil and Marcelo
Werneck): This paper presents a study comparative between two types of
in-fiber Fabry-Pérot interferometers (FPI) and a commercial fiber Bragg
grating (FBG) for magnetic field sensing. The first FPI sensor (FP1) was
manufactured with a 273 µm section of capillary fiber. The other FPI sensor(FP2) was manufactured by etching the tip of a telecom SMF (germaniumdoped) in hydrofluoric acid. The FPI sensors manufactured plus acommercial fiber Bragg grating (FBG), were bonded on a Terfenol-D piece.
The results show that the FP2 sensor presented a sensitivity of 2.02 times
higher than FP1 and 3.4 times higher than the FBG sensor.

16:30

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17:10

Ti/Au layers impact in prism-based plasmonic sensing of ethanol-fuelpurity detection (Jorge R Fernández and Vitor Freire and Hugo Enrique
Hernandez-Figueroa): In this work, the impact of a Titanium adhesion layer
for the deposition of gold on the performance of an SPR sensor based on
the Kretschmann configuration is analyzed. The theoretical and numericalanalysis of the SPR from the multilayer structure Fresnel reflection
coefficient point of view was taken and experimental results for ethanol
purity detection with a setup based on angular interrogation with a 632nm
He-Ne laser, one theta-2*theta stage, a photodetector, a BK7 prism, a
PDMS microfluidic system and two different Titanium/Gold layers withdifferent thicknesses were acquired.

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Saturday,
October 15th, 2022

27

Sponsors

Saturday, October 15th 2022
Hands-On Optics Workshop I
9:00
9:30
10:00

Room 1, 9:00 – 12:00(Talk) Adaptive Optics Systems (Brian Vohnsen and Denise Valente)(Talk) Optical Tweezers (Adriana Fontes and Diógenes Soares Moura)(Hand-On Experience) Adaptive Optics Systems (Denise Valente)

Hands-On Optics Workshop II
10:00

Room 2, 10:00 – 12:00(Hand-On Experience) Optical Tweezer Systems (Diógenes Soares Moura)

Hands-On Optics Workshop III
10:00

Room 3, 10:00 – 12:00(Hand-On Experience) Optical Techniques (OSA and SPIE Recife Chapters)

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