Technical Program

75

TCAD Simulation for Optics & Photonics

Eric Guichard (Silvaco Inc, USA)

► 9:00 to 9:30  ·  Auditorium

In this talk we will describe optical devices and technologies and the methods used to design and analyze them. It is essential to have tools that can model the complex and diverse structures found in these devices and simulate them to provide insight into their performance and behavior. These tools need to rely on advanced physics modeling that often goes down to the quantum mechanical level and at the same time need work at the macro level for predicting J-V, thermal, and optical parameters. These tools are called Technology computer-aided design (technology CAD or TCAD) are part of electronic design automation and models semiconductor fabrication and semiconductor device operation.

76

Optical fibers in life-science applications

S. Etcheverry, A. Sudirman, S. Sengupta, H. Parker, A. V. Harisha, R. Soares, H. N. Joensson, A. Russom, F. Laurell, and Walter Margulis (presenter, from RISE Acreo)

► 9:30 to 10:15  ·  Auditorium

Microstructured silica optical fibers and capillaries are a useful tool for various studies in life-sciences. Although not replacing lab-on-a-chip, they exhibit unique characteristics, such as minimally invasive footprint and potential use in-vivo. In this talk we describe some fiber-based systems that include high performance flow cytometers, cell separation and cell picking devices. We also discuss recent results on the development of a fiber-based molecular diagnostic system aiming at viral detection and quantification. The system is designed to perform loop-mediated isothermal amplification (LAMP) in thousands of droplets flowing in an optofluidic fiber arrangement. Digital viral presence or absence in each droplet is assessed through fluorescence...

77

Shining Light on Nonlinear Optics in 2D Layered Transition Metal Dichalcogenides

Anderson Stevens Leônidas Gomes

► 10:15 to 11:00  ·  Auditorium

2D Layered Transition Metal Dichalcogenides (LTMDs) are bi-dimensional nanostructures consisting of atomically thin monolayers of the type MX2, with M a transition metal atom and X a chalcogen atom. Besides the well-known and studied semiconducting MoS2 and WS2, semi-metallic ZrTe2 and metallic NbS2 are examples of 2D LTMDs. In this talk, I shall review the relevant properties of the four above mentioned materials, some of the fabrication methods, and will describe nonlinear optical studies covering a range of excitation regimes. Using CW or CW/ML (>1MHz repetition rate) excitation sources with linearly or circularly polarized light, we show that the intensity dependent refractive changes are thermal in origin, ~10-6cm2/W, and lead to ring formation due...

11:00 to 11:10

Break

78

Photonic Sensors at UTFPR – CPGEI

Jose Luis Fabris

► 11:10 to 11:55  ·  Auditorium

This talk will present and discuss, following an historical timeline, the main achievements in the field of Photonic sensing. The focus will be on the activities developed within the Graduate Program in Electrical and Computer Engineering – CPGEI at Federal University of Technology – UTFPR. In the presentation, the evolution of research will be presented. From the early developments on optical fiber grating sensors, the establishment of new Photonic sensing branches in Spectroscopy and Plasmonics will be discussed.

79

Compact Terahertz Driven Electron and X-ray Sources

Franz X. Kärtner

► 11:55 to 12:40  ·  Auditorium

The use of very high frequencies, in the THz region, specifically 100 – 500 GHz, enables operation of accelerators at higher field strength with lower energetic driver pulses. This opens up the possibility of compact low emittance electron sources and high-brightness fully coherent X-ray sources. In this contribution, we summarize the progress made in the ERC Synergy Grant AXSIS: Attosecond X-ray Science – Imaging and Spectroscopy in source technology. The high acceleration fields and field gradients possible in terahertz devices enables novel electron bunch manipulations, bunch diagnostic and promise ultimately fully coherent X-ray production from compact sources. Latest experimental results in the implementation of electron and X-ray sources based on this...

80

Metalenses with wide field of view and diffraction limited resolution: concepts and trade-offs

Invited Paper

Emiliano Rezende Martins (USP)

► 14:30 to 15:00  ·  Hall A

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Metasurfaces are nanostructured planar surfaces designed to control the phase and amplitude of an optical beam. They can be designed as a metalens, which finds widespread applications. Metalenses can be readily designed to obtain diffraction limited resolution, or as fisheye-type lenses with arbitrarily wide field of view. One of their main challenges, however, is to reduce all the aberrations in a single design. This paper compares the main physical constraints behind two of the most important monochromatic aberrations: spherical aberrations and off-axis aberrations. In the talk, novel routes to controlling the aberration will be presented.

81

Comparative spectroscopic studies between conventional and organic soybean oils

Carla Lopes (UNIFESP); Heron da Silva (UNIFESP); Lilia Courrol (UNIFESP/ICAQF)

► 15:00 to 15:20  ·  Hall A

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A healthy lifestyle based on an organic diet appears to be a growing trend among young adults. Organic soybean oils are an alternative to conventional oils, but they can be the subject of fraud that worries consumers, traders, and producers. The results obtained indicate that the combination of steady-state fluorescence techniques, considering mainly the characteristics of the spectra obtained with excitation at 320, 340 and 460 nm and time-resolved fluorescence with excitation around 403 nm, demonstrates the potential to differentiate oils conventional from organic soybeans oils.

82

Fluorescence spectroscopy study of conventional and organic soybean oil heated to 270 ºC

Carla Lopes (UNIFESP); Heron da Silva (UNIFESP); Lilia Courrol (UNIFESP/ICAQF)

► 15:20 to 15:40  ·  Hall A

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Edible vegetable oils are highly susceptible to lipid thermo-oxidation which results in the toxic substances production, with serious nutritional consequences. This work studies the fluorescence spectroscopy potential to determine oxidation status in these materials. The organic and conventional soybean oils fluorescence spectra have been studied and alterations were registered after heated at 270 ºC. Variations in chlorophyll fluorescence lifetime were analyzed to determine the pigment degradation. The results indicate that fluorescence spectroscopy is an efficient method to determine pigments degradation and increasing fatty acid oxidation products. It can be applied in the food industry and food quality control institutions.

15:40 to 16:00

Break

83

Cascaded refractive index and corrosion sensors in a D-Shaped optical fiber using LMR and SPR effects

Invited Paper

Vladimir Manoel da Silva Jr (UFPE); Joaquim F. Martins Filho (UFPE); Jehan Nascimento (UFPE)

► 16:00 to 16:30  ·  Hall A

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This article presents the proposed structure and simulation results from analytical modeling of a refractive index sensor and a corrosion sensor in a D-shaped single-mode optical fiber using the lossy mode resonance (LMR) and surface plasmon resonance (SPR) effects. The combined sensor consists of two cascaded D-shaped sensor regions. The first one, a bilayer of titanium dioxide – aluminum, operates under LMR condition. The second region, a bilayer of gold – titanium dioxide, operates under SPR condition. The sensors are interrogated by two wavelengths, 1310 and 1550 nm, in TE and TM modes. Sensor sensitivities and operating ranges are presented.

84

Imaging with a Rigid Multimode Fiber Bundle

Paloma Pellegrini (Unicamp); Claudecir Ricardo Biazoli (CTI); Paulo Jarshel (Unicamp); Lucas H. Gabrielli (Unicamp)

► 16:30 to 17:00  ·  Hall A

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A rigid multimode fiber bundle is proposed for imaging, in a experimental setup with no interferometric measurements. The great amount of propagating modes in the fiber bundle, along with high numerical aperture, enabled us to set predetermined focus targets in, approximately, 60 micrometers resolution. In order to do so, an optimization process to build transmission matrices was applied to overcome modal interference and obtain focus. Here, we also show that transmission matrices could be stored and combined, so focus could be simultaneously achieved in different locations, at the distal end of the fiber bundle.

85

Analysis of temperature in an air-cooled combustion motorcycle engine using sensors based on fiber Bragg gratings

Henrique Ferazza (UTFPR); Rodrigo Fiorin (UTFPR); Valmir de Oliveira (UTFPR); Ilda Abe (UTFPR); Hypolito J. Kalinowski (UFF)

► 17:00 to 17:10  ·  Hall A

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A fiber Bragg grating for monitoring the temperature of an air-cooled combustion motorcycle engine is presented in this study. The sensor is attached to the aluminum cylinder of the motorcycle and the characterization process is performed. We present the results of the heating and cooling curves during tests with the motorcycle at rest and in motion. A better understanding of the air cooling process can lead to the optimization of designs in this area.

86

An extended cavity diode laser constructed with additive manufacturing: Contribution for a brazilian compact atomic frequency standard with cold atoms

Invited Paper

Eduardo Cazarini (IFSP Araraquara); Stela Müller (USP); Luiz Damaceno (USP); Richard Mascarin (USP); Carlos Fortulan (USP); Vanderlei Bagnato (USP); Daniel Varela Magalhães (USP)

► 14:30 to 15:00  ·  Hall B

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The Time and Frequency Metrology field dedicated towards more compact standards has research groups dedicated to cold atoms systems, in order to improve embedded applications. Our group has been developing a compact system using 133Cs cold atoms and already showed some versions of proof-of-principle. We developed a first prototype of an extended cavity diode laser using additive manufacturing of ABS (acrylonitrile butadiene styrene) and obtained a very light and thermally isolated version with an intracavity interference filter. We will show preliminary results of this first version and discuss some aspects of the system for the new compact frequency standard.

87

Visible and Near-Infrared Optical Characterization of Human Belly Skin Tissue and Phantoms

Luismar B. Cruz Jr (USP); Carlos Eduardo Girasol (USP); Kaio B. Barros (USP); Rinaldo Guirro (USP); Luciano Bachmann (USP); Pedro coltro (USP)

► 15:00 to 15:20  ·  Hall B

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Determining the optical properties of biological tissues are important for medical, technological and research applications. The main objective of this work was to determine the optical properties of biological skin tissues and phantoms from 500 to 1300 nm using integrating spheres to acquire the diffuse reflectance and transmittance light and the inverse adding doubling algorithm to compute the optical coefficients. It was acquired the optical absorption coefficients, reduced scattering and depth penetration of the human skin. Phantoms that mimic optical properties of skin were also manufactured and characterized. The skin phantoms were able to properly simulate the optical properties.

88

Analytical Solutions for TM Modes in Magneto-Optical Planar Waveguides

Licinius Dimitri Sá de Alcantara (UFRA)

► 15:20 to 15:40  ·  Hall B

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From Maxwell's equations, an analytical formulation is developed to calculate the propagation characteristics and field profiles of transverse magnetic (TM) modes on magneto-optical (MO) planar waveguides. Results show nonreciprocal behavior in terms of both modal effective index and field profile analyses. The proposed model can be used as a reference to assess the nonreciprocal potentialities of such structures.

15:40 to 16:00

Break

89

Nonlinear imaging of biological tissues

Invited Paper

Ana Maria de Paula (UFMG)

► 16:00 to 16:30  ·  Hall B

Precise diagnosis and prognosis are important in prevention and reduction of morbidity and mortality in all types of cancers. We present imaging of biological tissue by second harmonic generation and multiphoton excited fluorescence microscopy as a potential tool in helping with cancer diagnosis. We demonstrate a methodology to evaluate the changes caused by cancer in collagen and cellular parameters of histological biopsies using automated image analysis and machine learning techniques. The procedure allowed to separate between the healthy and cancerous tissue with an accuracy of around 90% for canine mammary cancer and for human prostate cancer. In addition the results for canine mammary gland carcinomas show that the measured tissue collagen parameters...

90

Development of a portable lensfree holographic microscope to imaging cell cultures

Camila de Paula D'Almeida (USP); Patrick Oliveira Feitosa (USP); Natália Portes de Oliveira (USP); Sebastião Pratavieira (USP)

► 16:30 to 16:50  ·  Hall B

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Microscopes are important imaging tools for accessing microscale information in a variety context, including routine visual analysis for cell culture. As an alternative to traditional optical microscopic instrumentations, lensfree microscopy is an emerging modality, which is efficient to provide portable apparatus that provides images with decoupling resolution from field of view. In this paper we present an compact and easy-to-use imaging equipment, based on optical lensfree holographic microscopy, which performs amplitude and phase images from a sequence ofcaptured images at different distances from the sample, resulting in images with almost 30 squared millimeters and 4 micrometers of resolution.

91

Image haziness contrast scale describing optical scattering depth

André Riccieri Albinati Vitor (USP); George C. Cardoso (USP)

► 16:50 to 17:10  ·  Hall B

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Contrast is not uniquely defined in the literature. In particular, there is a need for a contrast measure that scales linearly and monotonically with the optical scattering depth of a translucent scattering layer that covers an image. Here, we address this issue proposing an image contrast metric, which we call haziness contrast metric, and experimentally test it using milk as a scattering medium to simulate a decline in image contrast. Compared to other contrast metrics in the literature, the proposed metric is the closest to linear, as a function of the increasing density of the scattering material on the image.

92

How to develop your PIC-based product – from prototype to production

Giovanni Farias (VLC Photonics, Spain)

► 14:30 to 15:15  ·  Hall C

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Photonic Integrated Circuits technologies bring several advantages compared to traditional bulk products that are based on discrete components. In this tutorial, the workflow for the development of products based on Photonic Integrated Circuits (PIC) will be presented. The steps of a full development cycle, from system concept to test and packaging will be reviewed. The PIC platforms available for fabrication will be presented and compared, and their maturity will be discussed. Finally, a discussion about the Technology Readiness Levels (TRLs) and the requirements for each step, from prototype to pre-production will be made.

15:15 to 15:20

Break

93

Brillouin optomechanics nanophotonic structures

Thiago Alegre (Unicamp)

► 15:20 to 16:05  ·  Hall C

The interaction between light and mesoscopic mechanical degrees of freedom has been investigated under various perspectives, from long-haul optical fiber communication system penalties to gravitational-wave detector noise. In the context of integrated photonics, two topics with dissimilar origins — cavity optomechanics and guided wave Brillouin scattering — are rooted in the manipulation and control of the energy exchange between trapped light and mechanical modes. In this talk, I will review some of the key aspects of this interaction and how to use fine control over the design and fabrication of microstructures to control both the optical and acoustic spectra to shape such interaction.

16:05 to 16:10

Break

94

Custom manufacturing of photonic ICs

Roberto Panepucci (CTI)

► 16:10 to 16:55  ·  Hall C

This is a review tutorial on the custom fabrication of photonic integrated circuit devices. It is geared towards researchers with an interest in designing photonic devices and circuits that take advantage of silicon-based CMOS technologies, and more generally of foundry services as a platform for customizing their ideas. The audience will be exposed to: photonic device basics, material properties, actuation strategies, physical design, fabrication aspects and testing of photonic devices. Our goal is to provide a starting point for the interested reader to take advantage of so called ´foundry´ runs or multi-project-wafer runs to gain access to state-of-the-art capabilities as a platform in which to add new materials, structures and innovation.

95

Protoporphyrin IX: An Endogenous Theranostic Compound

Lilia Courrol (UNIFESP)

► 14:30 to 15:15  ·  Hall D

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Porphyria, cancer, and atherosclerosis patients manifest increased concentration of protoporphyrin IX (PpIX) in tissues and blood, and PpIX fluorescence can be used to diagnose these diseases. This review will describe the role of PpIX inside the cells and organisms. Diagnosis and therapy approaches using PpIX will be described. Finally, we will also evaluate if PpIX could be used to diagnose and treat Covid-19 since an abnormal phenomenon related to hemoglobin dysfunction was observed in the patients with this disease

15:15 to 15:20

Break

96

Machine Learning methods for micro-FTIR imaging classification of human skin tumors

Denise Zezell (IPEN)

► 15:20 to 16:05  ·  Hall D

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This review presents some methods applied to micro-FTIR imaging for classification of human skin tumors. It is a collection of the pre-processing pipeline and machine learning classification models. The aim of this review is to update and summarize the current methods which are applied in our skin tumor research.

16:05 to 16:10

Break

97

Antimicrobial Photodynamic Therapy

Cristina Kurachi (USP)

► 16:10 to 16:55  ·  Hall D

Antimicrobial photodynamic therapy (aPDT) uses the combination of photosensitizer, light and oxygen to induce microorganism death for the local treament of infected tissues. Its mechanism of action is based on the production of reactive species, mostly singlet oxygen, resulting in the oxidative damage of any biomolecule nearby where the photosensitizer is located. If minimal conditions of local photosensitizer and oxygen concentrations and light dose are achieved, microorganism inactivation is induced. One of the main advantages of aPDT is due to its action being non-biological site specific, so inactivation of distinct species of bacteria, fungi and virus are observed, and antimicrobial resistance is highly unfeasible. Examples of aPDT applications will be...