Monday, October 8th
Invited Paper – CD Estimation in FMFs Using the Auto-Correlation of the Signal Power Waveform
Henrique Santana, Lailson Santos, Felipe M. Ferreira and Darli Mello
► 14:00 · Auditorium · Optical Communication 1
The exhaustion of the capacity of conventional optical systems based on standard single-mode fibers (SSMF) requires new solutions cope with the exponential traffic increase. In this scenario, transmission by few-mode fibers (FMFs) appears as a strong candidate. These systems require adaptive digital signal processing (DSP) algorithms with multiple inputs and multiple outputs (MIMO) at the receiver in order to recover the signals multiplexed signals in the various spatial and polarization modes. However, the proper functioning of these equalizers requires the pre-compensation of the chromatic dispersion (CD) of the receiver using static filters. Since the DSP algorithms in mode-multiplexing systems are of slow convergence, the typical scanning algorithms...
Deterministic Jitter Effects in High Order Modulation for 400G and 600G Single-Carrier Transmission
Eduardo Rosa, Matheus Rodrigues, André Souza and Stenio Ranzini
► 14:30 · Auditorium · Optical Communication 1
We evaluated, in a simulated back-to-back 400G and 600G scenario, the effects of deterministic jitter in comparison to penalties inflicted by phase noise from laser linewidth, considering 64QAM and 256QAM single carrier systems. While phase noise is a relevant parameter for such modulation formats in general, deterministic jitter is shown to be dominant on systems with both high baud rate and high order modulation formats.
Roll-off factor control to increase the energy efficiency of a Nyquist-WDM pulse-shaping filter
Leonardo Vanzella, Rafael Ferreira, Diego M Dourado, Mônica de Lacerda Rocha and Daniel M Pataca
► 14:50 · Auditorium · Optical Communication 1
We investigate the effect of adjusting the excess in bandwidth (roll-off factor) of a pulse-shaping filter on the performance of a long haul (N-WDM) 21 × 256 Gb/s PM-16QAM coherent system. After calibrating a simulator with the results obtained experimentally, taken with a roll-off set to 0.1, we varied the roll-off value from 0.1 to 1.0 in the simulation setup and verified its impact on the transmission in a linear regime. The simulated results were, then, combined with data obtained from the literature relating the number of taps of a FIR filter to its energy consumption. Within a given transmitted reach and as long as the system operates within the FEC limit, it is demonstrated that a less stringent specification for the roll-off can lead to a reduction...
Impact analysis of the use of the power mask spectrum information in the adaptive control of optical amplifiers
Erick A. Barboza, Marcionilo José da Silva, Leonardo Didier Coelho, Carmelo Bastos-Filho and Joaquim F. Martins-Filho
► 15:10 · Auditorium · Optical Communication 1
One of the significant challenges in the dynamic optical networks is the adaptive control of operating point (ACOP) of optical amplifiers. The ACOP approaches aim to autonomously define the gain of the amplifier after changes in the amplifier input power. The ACOP approaches proposed so far use the amplifier power mask to define the gains. The full power mask has information about gain and noise figure for each channel considered in characterization. However, most of these approaches consider a simplified version of the power mask that stores just the worst ripple and worst noise figure among all channels for each operating point. In this paper, we analyze the impact of using the full power mask, instead of the simplified power mask, in one of the first...
Invited Paper – Active Photonic Integrated Circuits based on the Silicon-On-Insulator Platform
Roberto Ricardo Panepucci
► 16:00 · Auditorium · Integrated Photonics 1
Photonic integration is still looking for a killer application where the industry will coalesce in leveraging the know-how from the microelectronics industry and enable low cost fiber-to-the-chip integration. Key to the deployment of active photonics is the ability to include low-cost light sensing, light sources and non-reciprocal devices in a packaging platform enabling the full range of functionalities expected of fiber-optics systems to become available on-chip. In this talk I will review the early work, as well as the latest developments, in establishing a high-volume integrated circuit process for photonic active devices.
Design and optimization of subwavelength silicon photonics edge coupler for cleaved fibers
Uiara de Moura, Giovanni de Farias, Yesica Rumaldo Bustamante, Brad Snyder, Andy Miller, Joris Van Campenhout and Philippe Absil
► 16:30 · Auditorium · Integrated Photonics 1
We propose a fiber-chip edge coupler based on a subwavelength grating in silicon-on-insulator (SOI) platform for coupling to cleaved and high numerical aperture (HNA) optical fibers (mode field diameter of 6.3 um). Its robustness to fabrication errors and high tolerance to fiber misalignment (+-1.5 um for a 1 dB of excess loss) make it suitable for high-volume production, being a potential candidate for data center applications. Simulation results show a 1 dB bandwidth higher than 200 nm, a polarization dependent loss lower than 0.5 dB, and minimum coupling losses of 1.47 and 1.39 dB for TE and TM modes, respectively, considering a 204 um-long mode converter.
All-fiber graphene electro-optic modulators with different dielectric materials
Matheus Bonando, Maria Cecília Schineider Araújo and Lúcia Saito
► 16:50 · Auditorium · Integrated Photonics 1
We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a side-polished optical fiber using different dielectric materials such as aluminum oxide (Al2O3), hafnium oxide (HfO2) and hexagonal boron nitride (h-BN). Although HfO2 model resulted a higher modulation depth with a thinner dielectric thickness, in the device comparison, the best results were obtained by h-BN model. For a PMMA superstrate thickness of 100 and 700 nm, the analysis presents a modulation depth of 11.9 dB/mm and 12.9 dB/mm, drive voltage of 70.8 and 13.8 V and cutoff frequency of 6.1 and 1.3 GHz, respectively. Considering a required modulation depth, the h-BN thickness is 2.3 times smaller than required for Al2O3 modulator.
Graphene-based electro-optical modulators integrated into polymer waveguides with three dielectric materials
Wanderson A Camacho, Eunézio Thoroh de Souza and Lúcia Saito
► 17:10 · Auditorium · Integrated Photonics 1
This work presents an analysis of electro-optical modulators integrated into polymer waveguides, which operates over electro-absorption effect through graphene. This study focus in three different dielectric materials for the capacitive structure in the device such as silicon nitride, Si3N4, hafnium oxide, HfO2 and hexagonal boron nitride, hBN. By varying the thickness of the dielectric material, it was possible to improve the extinction ratio, modulation frequency and reduce the switching voltages requirements. By considering a bottom cladding, it was possible to increase the light interaction with the graphene and obtain higher modulation frequencies. In the case of the device with HfO2, it was possible to obtain the highest extinction rate of 0.117 dB/µm...
Invited Paper – Biophotonics and lasers shining light into diseases: IPEN experience
Denise M. Zezell
► 14:00 · Amphitheater 1 · Biophotonics 1
We evaluated the effect of combining laser irradiation (Nd:YAG and Er,Cr:YSGG) with fluoride on an enamel microstructure and demineralization by FTRaman and FTIR Spectroscopy. Demineralization promoted reduction in organic contents; Nd:YAG laser irradiation promoted loss of carbonate and organic content, while Er,Cr:YSGG did not produce significant changes in the relative band intensities of organic and inorganic contents of the enamel. In lased samples, almost no effects caused by pH-cycling on enamel were observed. Our group showed that laser treatment and its association with fluoride can interfere with the demineralization dynamics, reducing its effects over the enamel. X-Ray diffraction at Synchrotron source provided information on the crystalline...
Synthesis of hybrid AuFe nanoparticles by Photoreduction and Methyl Aminoluvinate
Karina Gonçalves, Flávia R. O. Silva, Daniel Vieira and Lilia Courrol
► 14:30 · Amphitheater 1 · Biophotonics 1
The nanohybrid gold/iron (AuFe) system is particularly interesting for biomedical applications such as targeted drug delivery, hyperthermia and photodynamic therapy (PDT) mainly due to its magnetic combined to the plasmonic properties. In this study, we aimed to synthesize nanohybrids to be used as a vehicle to deliver Methyl Aminoluvinate (MAL) for selective and efficient PDT. MAL is a prodrug that is metabolized to protoporphyrin IX (PpIX), photosensitizer in PDT. The nanohybrids were synthesized by photoreduction of solutions containing iron powder, polyethylene glycol (PEG), chloroauric acid (HAuCl4) and MAL as a reducing agent in water solution. The products were characterized by UV-Vis, zeta potential and transmission electron microscopy. The...
Biochemical characterization of skin burn wound healing using ATR-FTIR
Pedro Castro, Telma Zorn and Denise M. Zezell
► 14:50 · Amphitheater 1 · Biophotonics 1
Efficient biochemical characterization of skin burn healing stages can improve clinical routine to adjust patients treatment. The golden standard for diagnosing skin burning stages is the histological biopsy. This practice is often expensive and technically challenging. There have been advances in the treatment, and diagnostic of the critical skin burned patients due to the increase of multidisciplinary collaboration. The contributions from different fields of biomedical engineering motivate to develop a better procedure for clinical applications. Considering the difficulty of monitoring wound healing, the Fourier Transform Infrared spectroscopy coupled with an Attenuated Total Reflectance (ATR-FTIR) accessory is an analytical technique that can provide...
K-means and Hierarchical Cluster Analysis as segmentation algorithms for FTIR hyperspectral images
Cassio Lima and Luciana Correa, Hugh Byrne and Denise M. Zezell
► 15:10 · Amphitheater 1 · Biophotonics 1
Fourier Transform Infrared (FTIR) spectroscopy is a rapid and label-free analytical technique whose potential as a diagnostic tool has been well demonstrated. The combination of spectroscopy and microscopy technologies enable wide-field scanning of a sample, providing a hyperspectral image with tens of thousands of spectra in a few minutes. In order to increase the information content of FTIR images, different clustering algorithms have been proposed as segmentation methods. However, systematic comparative tests of these techniques are still missing. Thus, the present paper aims to compare the ability of K-means Cluster Analysis (KMCA) and Hierarchical Cluster Analysis (HCA) as clustering algorithms to reconstruct FTIR hyperspectral images. Spectra for...
Development and Optical Characterization of Supersonic Gas Targets for High-Intensity Laser Plasma Studies
Ricardo E. Samad, Armando V. F. Zuffi, Edison Maldonado and Nilson Vieira
► 16:00 · Amphitheater 1 · Optics and Instrumentation 1
Laser particle acceleration is a rapid growing field due to the compactness and smaller cost when compared to traditional accelerators, as well as the potential for new applications resulting from the unique characteristics of the beams generated. Frequently, laser acceleration techniques require laser intensities higher than 100's of PW/cm² and high-density gas targets, with specific profiles. In the effort to implement laser electron acceleration in our laboratories, we report the development of submillimetric, supersonic gas nozzles, the implementation of optical techniques for the determination of the gas jets density profiles, and the characterization of laser-induced plasmas obtained at laser intensities surpassing 10¹⁶ W/cm². The characterization...
Multilayer Perceptron Models for Band Diagram Prediction in bi-dimensional Photonic Crystals
Adriano da Silva Ferreira, Gilliard N. Malheiros-Silveira and Enrique Hernandez Figueroa
► 16:20 · Amphitheater 1 · Optics and Instrumentation 1
We modeled Multilayer Perceptron (MLP) Artificial Neural Network for predicting band diagrams (BD) of bi-dimensional photonic crystals. Datasets for MLP training were created by relating geometric and material properties to BDs of triangular- and square-lattice photonic crystals. We demonstrate that fast-training MLP models are able to estimate accurate BDs and existing photonic band gaps through rapid computations.
On the role of silver nanoparticles shape for SERS of Rhodamine
Lays Costa, Victor Hugo Martins, Marcia Muller and L Fabris
► 16:40 · Amphitheater 1 · Optics and Instrumentation 1
This work shows the photoinduced shape conversion of spherical silver nanoparticles produced by laser ablation in liquids. Photoexcitation for shape conversion employed a combination of blue and white LEDs. Photoconversion used hydrogen peroxide as oxidizing agent under different sodium citrate capping conditions of nanoparticles. Rhodamine 6G was the molecule probe for following the influence of shape conversion in the efficiency of surface enhanced Raman scattering.
Gradient Refractive Index Polymer Rod
Roddy Elky Ramos Gonzales, Jonas Fontes Garcia, Luiz Barbosa and Cicero Souza Filho
► 17:00 · Amphitheater 1 · Optics and Instrumentation 1
The present paper is related to this process of fabrication of a gradient refractive index polymer rod for use as a medium of image transmission and for preparing a polymeric optical fiber by melt spinning. It is used to the technique of external chemical deposition or what is denominated in the field of optical fibers of Outside Vapor-Phase Oxidation.
Rigid Endoscope of the Microstructured Optical Fiber
Roddy Elky Ramos Gonzales, Jonas Fontes Garcia, Cicero Livio Omegna de Souza Filho and Luiz Barbosa
► 17:20 · Amphitheater 1 · Optics and Instrumentation 1
Construct and fabricate microstructured optical fibers from medium-melting glass and equipment capable of manufacturing optical fibers for endoscopes. The manufacture of rigid endoscopes, adequate resolution and low cost, favors the introduction of endoscopy systems with single-use or disposable instruments.
Invited Paper – Narrow linewidth (<100kHz) and high output power (>16dBm) external cavity lasers for coherent optical communications
Giovanni de Farias, Hening Andrade, Leandro T. Zanvettor, Luiz Heckler de Carvalho, Maria Chiara Ubaldi, Aldo Righetti, Giorgio Grasso, Fausto Meli and Lucia Ferrario
► 14:00 · Amphitheater 2 · Lasers 1
In this paper, the design methodology and main experimental results of an External Cavity Laser (ECL) with narrow linewidth (<100kHz) is presented. The ECL is based on a wavelength-selective mirror controlled by voltage. Among other features, the device presents high optical output power (>16dBm) and potential to achieve 40nm tunability in C-band. System performance of 16-QAM transmission is better than commercial reference Integrated Tunable Laser Assembly (ITLA). The device is compact, suitable for small-form factor transceivers and modules.
Characterization of Below Threshold Harmonics Generated in Argon by Ultrashort Laser Pulses
Armando V. F. Zuffi, Andreia Almeida, Nilson Vieira and Ricardo E. Samad
► 14:30 · Amphitheater 2 · Lasers 1
This work reports studies of the generation of below threshold harmonics by ultrashort laser pulses in gas nozzles in vacuum. Odd harmonics of the laser, ranging from the 3rd up to the 9th, were generated in the UV and VUV regions, and the frequency conversion occurred in flowing gas. The harmonics were spectrally characterized, and the orders of the nonlinear processes were determined, showing that for the higher order harmonics competing processes decrease the energy coupling into the new frequencies. Also, the conversion efficiencies were estimated, showing that a few percent of the laser pulses energy are converted into the harmonics.
SERS activity of Co, Ni and Bi nanoparticles
Juliana Thaler, Thiago Neves Machado, Rafael Nadas, Jorge Lenz, Thiago Woiski, Wido Schreiner and Ricardo Kamikawachi, Arandi G Bezerra, Jr.
► 14:50 · Amphitheater 2 · Lasers 1
Plasmonic activity of Co, Ni and Bi nanoparticles was investigated, with emphasis on Surface-Enhanced Raman Scattering (SERS). Nanoparticles were produced via laser ablation synthesis in water, and characterized through UV-Vis optical absorption, dynamic light scattering (DLS), and transmission electron microscopy (TEM). The studied materials present localized surface plasmon resonances (LSPR) extending from the ultraviolet to the visible and near infrared, and SERS activity was demonstrated using proline as a probe molecule. The results were compared to those using gold nanoparticle substrates under similar experimental conditions, and demonstrate that all tested nanoparticles show promising potential for the development of SERS-based sensors, which may be...
Roughness as Entanglement Witness: The two Coupled Cavity Mode
Mauricio Reis e Silva, Jr. and Adelcio Oliveira
► 15:10 · Amphitheater 2 · Lasers 1
In this work we investigate the entanglement dynamics of two coupled superconducting cavities, whose excitation levels can be 0 or 1, thus representing the implementation of a two qubit system. We use the Concurrence as a measure of entanglement between the two systems and compare it to the Roughness of the system, which indicates the degree of classicality of a given quantum state. Although the Concurrence values are not directly related with the Roughness of each subsystem alone, we found evidence of correlation between the two functions when considering a generalized sum of Roughness over the two subsystems, whereas the minimum of one of them occurs for the maximum of the other. Based on the behaviour of the two functions, we use them to propose a new...
Invited Paper – Minimalist Optical Fiber Design: capillary-like fibers
Jonas Osório, Giancarlo Chesine, Valdir Serrão. Marcos A. R. Franco and Cristiano M.B. Cordeiro
► 16:00 · Amphitheater 2 · Optical Sensors, Image and Illumination 1
Microstructured optical fibers with ultra-simplified designs are investigated. Guiding mechanism can be achieved in an embedded or surface germanium-doped core or in the hollow part of capillaries. Fiber wall thickness and/or stress induced birefringence can be modified with external stimuli. Results showing this interesting platform for sensing of parameters such as pressure, temperature, refractive index and directional curvature will be presented.
Magnetic and Fiber Bragg Grating Characterization of 3D Printed Magnetic Samples
Hugo de Freitas, Fanny Béron, and Cristiano MB Cordeiro
► 16:30 · Amphitheater 2 · Optical Sensors, Image and Illumination 1
Magnetic 3D printed samples have been simultaneously studied with an optical Fiber Bragg Grating (FBG) and a Vibrating Sample Magnetometer (VSM). The samples were manufactured with a 3D desktop printer, using a ferromagnetic Polylactic Acid (PLA) filament. Both the shape and printing filling fraction of the samples were varied. We directly measured the magnetic force between the printed unit and a permanent magnet using a FBG. This result was compared with the calculated magnetic force, obtained through VSM and gaussmeter data. The filament saturation magnetization was evaluated to be 34.60 Am2/kg, indicating a magnetite content of around 35%. The obtained magnetic hysteresis curve exhibits a soft magnetic behavior, meaning that the printed unit does not...
Optofluidic Device based on a 3D Printed Chip and a Sensing Tilted Fiber Bragg Gratings
Stenio Aristilde, Gildo Rodrigues, Fabiano Fruett, Cristiano MB Cordeiro
► 16:50 · Amphitheater 2 · Optical Sensors, Image and Illumination 1
In this work an optical solution to characterize optofluidic devices is proposed. The fluidic chip was manufactured via 3D printing and it is able to produce a stream of water droplets in oil. The optical characterization was realized using a Tilted Fiber Bragg Grating (TFBG) embedded in the chip and whose cladding modes could vary between guided and leak. This is the first time a fully integrated all-optical scheme is demonstrated to monitor a droplet generator fluidic device.
Design and Application of Optical Fiber Sensors for Force Myography
Eric Fujiwara, Yu Tzu Wu, Caio Villela, Matheus Gomes, Marco Soares, Carlos Suzuki, Antonio Ribas Neto and Eric Rohmer
► 17:10 · Amphitheater 2 · Optical Sensors, Image and Illumination 1
The force myography (FMG) is a method for retrieving the hand movements by assessing the radial forces exerted by the forearm muscles. In this context, optical fiber transducers based on different principles (microbending, LPFG, specklegram, and hetero-core structure) are evaluated for the measurement of FMG signals. Furthermore, the microbending transducer was applied on gesture recognition for the real-time control of a virtual prosthetic hand. The sensor presented ~0.05 N-1 sensitivity for a 20 N range and was successfully implemented on the classification of 4 postures, providing a low-cost and reliable approach for controlling multi-grasp bionic hands.
Tuesday, October 9th
Invited Paper – On the use of high-order MIMO for crosstalk mitigation in multi-core fiber based SDM systems
Rubens S. Luís, Georg Rademacher, Benjamim J. Puttinam, Yoshinari Awaji and Naoya Wada
► 14:30 · Auditorium · Optical Communication 2
We review our latest contributions towards the development of long-distance transmission systems using homogeneous single-mode multi-core fibers supported by high-order MIMO for crosstalk mitigation. These include the use of high-order MIMO to mitigate the crosstalk impact assisted by inter-core skew compensation to manage the temporal extent of the system impulse response.
Recursive Blind Phase Search Architecture for Phase Recovery at High Error Rates
Aparna Aravind, André Souza and Darli Mello
► 15:00 · Auditorium · Optical Communication 2
We propose a phase recovery architecture suitable for channels with low phase noise and high additive noise. The algorithm replaces window filters of the blind phase search (BPS) algorithm by forgetting factors. Simulations and experimental results indicate that the proposed algorithm achieves equivalent performance as BPS and better performance than decision-directed (DD) algorithm at a potentially lower complexity.
Linear spectral conversion for all-optical synchronization of O-OFDM QPSK subcarriers
Rafael Ferreira, Diego M Dourado, Mônica de Lacerda Rocha and Daniel M Pataca
► 15:20 · Auditorium · Optical Communication 2
Two spectral conversion techniques, configured for providing all-optical clock recovery and synchronization of subcarriers, are compared in an all-optical orthogonal frequency division multiplexing (O-OFDM) quadrature phase shift keying (QPSK) system. For that, the performance of the optical inverse fast Fourier transform (O-IFFT) and optical fast Fourier transform (O-FFT) operations were evaluated in a simulated setup. These operations are required for all-optical multiplexing and demultiplexing of O-OFDM subcarriers, respectively. Both clock recovery techniques perform a spectral conversion but one is based on the nonlinear effect of four wave mixing and the other, on linear optical filtering. As far as we know, only the first method has already been...
Approach for 10 Gb/s Silicon Integrated Optical Receiver for GPON
Celio A. Finardi, Stefan Tenenbaum, Roberto R. Panepucci
► 15:40 · Auditorium · Optical Communication 2
This paper presents our development of an integrated optical receiver based on active silicon photonic ICs for GPON solutions. The receiver core was fabricated and characterized for rates up to 10 Gb/s. The optical core is composed of a triplexer filter with integrated Ge photodetectors in downstream reception. This approach was characterized in two levels: one focused on device, characterized through optical-electric band (OE), followed by a systemic level study, focusing on performance in data transmission through eye diagram.
Invited Paper – The Impending Optical Network Capacity Crunch
► 16:30 · Auditorium · Optical Network 1
Since the turn of the century, when the Internet traffic became dominant in the communication networks, the average growth rate of the traffic has been about 40%/year, which doubles the traffic every two years, thus multiplying it by a factor of one thousand in twenty years. The main strategy to absorb this unusual growth rate has been bandwidth mining through successive generations of WDM equipment with increasing number of wavelengths, but this approach is nearing exhaustion now. It is estimated that the current traffic growth rate, which remains unabated, will lead to a capacity crunch in the optical fiber networks in the next decade. The paper will discuss the implications of this impending crunch, the strategies that are foreseen to face it, and the...
A Routing and Spectrum Assignment Heuristic for Elastic Optical Networks under Incremental Traffic
Leonardo Mesquita, Alex Santos, Karcius Assis, Marcelo S. Alencar, Raul C. Almeida Jr
► 17:00 · Auditorium · Optical Network 1
In Spectrum-sliced Elastic Optical (SLICE) networks based on orthogonal frequency division multiplexing (OFDM), several signals can be overlapping into the same fiber optical link, each signal modulated by tightly packed orthogonal sub-carriers that can be adjacently allocated to satisfy different bandwidth requirements. The finer granularity of all optical OFDM-based bandwidth allocation is more efficient than the networks based on wavelength division multiplexing (WDM). However, the routing is more difficult because of the spectrum assignment. Then the problem is known as the routing and spectrum assignment (RSA). To solve the RSA, we propose a heuristic algorithm to minimize the maximum load and balance the traffic load over the network while minimizing...
ONSIM: The Optical Network Simulator for Hybrid Switching Paradigms
Luiz H Bonani, Marcelo Abbade and Joel C Queiroz
► 17:20 · Auditorium · Optical Network 1
The elastic optical network (EON) was proposed as a solution to avoid the spectrum waste in conventional WDM networks, since it improves the network utilization. However, the elastic optical network is still based on an optical circuit switching (OCS) paradigm, which tends to waste bandwidth resources due to idle times of the reservation process. Hybrid solutions, including the optical packet switching (OPS) paradigm have been proposed in optical networks designed for specific applications, for instance data center optical networks, and offers a better efficiency in the resource usage. Therefore, to allow future studies we present an adaptation of Optical Network Simulator (ONSim) to work on hybrid switching paradigms. As an example, we analyze blocking...
A Proposed BSR Heuristic Considering Physical Layer Awareness
Pedro J. F. C. Souza, Raul C. Almeida Jr, Alex Santos, Karcius Assis, Matheus Sena
► 17:40 · Auditorium · Optical Network 1
In Elastic Optical Networks (EON), the problem of routing and spectrum Allocation (RSA) has been solved along the years through the use of optimization techniques or heuristics, with the aim of minimizing the use of network resources or maximizing the capacity for future requests. The effects of the physical layer in the RSA problem are of fundamental importance given that there is a distance limitation with the required bit rate and modulation format used to transmit the signal. On considering the linear and non-linear noise effects, it is possible to include quality of transmission (QoT) in the optimization process. In this paper, we propose a modification to a traditional heuristic for the RSA problem in Elastic Optical networks to consider both effects...
Side-lobe level reduction in 1D photonic array antennas
Bruna Dias Peres de Sousa, Antonio Ferrera, Marcelo Abbade and Ivan A Aldaya
► 14:30 · Amphitheater 1 · Integrated Photonics 2
Photonic array antennas have been proposed to improve radiation features and to enable dynamic beam steering and beam forming. In CMOS-compatible photonic array antennas, fabrication constraints, however, limit the minimum separation distance between radiation element to several wavelengths, which results in the presence of strong side-lobes known as grating lobes. These grating lobes represent a critical impairment that prevents the adoption of these sparse array antennas in applications where crosstalk and security faults must be avoided. In this work, we numerically analyze the side-lobe level (SLL) reduction of 1D sparse antenna arrays under beam steering operation when the radiating elements are arranged non-uniformly (the separation between radiation...
All-optical Drifting and Locking of a Microring Resonator Resonance
Stefan Tenenbaum and Roberto R. Panepucci
► 14:50 · Amphitheater 1 · Integrated Photonics 2
In this paper, we report on the experimental observation of the thermal effects leading to an all-optically induced drifting and locking of the resonant wavelength of a silicon microring resonator. Moreover, we show that fluctuations in the wavelength of a laser may lead to the optical drifting effect, whereby the resonance of the device is locked to a non-resonant wavelength of a high-power laser tuned near the resonant wavelength. This effect is important as it may lead to a failure mechanism that could arise in system-to-system communications and can be considered a potential candidate to the all-optically tuning and stability of a microring-resonator resonance.
Demonstration of broadband and polarization-insensitive silicon photonics 3 dB splitter compatible with CMOS process
Yesica Rumaldo Bustamante and Giovanni de Farias
► 15:10 · Amphitheater 1 · Integrated Photonics 2
We demonstrate a broadband and polarization insensitive 3~dB power splitter compatible with CMOS process. The simulation results show low insertion loss in the wavelength range from 1460 to 1640 nm for both TE and TM polarization. The fabricated device has a maximum insertion loss of 0.5 dB and 0.07 dB for TE and TM polarization, respectively, from 1520 to 1580 nm wavelength.
3D numerical analysis of the acousto-optical modulation in a double-core optical fiber
Isabela Javorsky, Ricardo E. Silva, Marcos A. R. Franco and Alexandre Pohl
► 15:30 · Amphitheater 1 · Integrated Photonics 2
The modulation of a double-core fiber using a flexural acoustic wave is numerically demonstrated. The stress caused by the acoustic wave in the fiber is calculated, as well as the power transfer between the cores and the modulated transmission spectrum. The results show that the presented methodology is promising for simulation of fibers with more cores and complex geometries.
Modeling and trade-off analysis of a capacitive silicon Mach-Zehnder modulator for telecom applications
Diego M Dourado, Mônica de Lacerda Rocha, Giovanni de Farias, João Ribeiro and João Carmo
► 15:50 · Amphitheater 1 · Integrated Photonics 2
This paper presents a capacitive modulator design and modeling using poly-si and silicon technologies. We propose a methodology involving the entire modulator design process, from the optical design, charge distribution calculation and small-signal RF analysis. Thus, in the case of silicon photonics modulators, the paper proposes means to optimize the trade-offs among several figures of merit. It is shown that high bandwidth operation (>30GHz) can be achieved by sacrificing a little the modulation efficiency.
Invited Paper – Advances in Random Lasers
Niklaus Wetter and Ernesto Jimenez Villar
► 14:30 · Amphitheater 2 · Lasers 2
Random lasers hold the premise for cheap, coherent light sources that can be miniaturized and molded into any shape with several other added benefits such as speckle-free imaging; however, they require improvements specifically in terms of efficiency and lower threshold. Here we demonstrate strategies to overcome these limits and demonstrate random lasers that have overall efficiencies of 50%, comparable to bulk lasers, as well as random lasing at the Anderson localization transition with low threshold due to the enhanced light-matter interaction.
Pressure measurement by low coherence speckle interferometry membrane shaping with tunable diode lasers
Marcelo Saita, Eduardo Barbosa, Francisco Degasperi and Niklaus Wetter
► 15:00 · Amphitheater 2 · Lasers 2
Non-contact evaluation of object deformation is of great importance in several industrial and scientific processes. In this work the demonstrate that low-coherence digital speckle pattern interferometry can be employed for pressure measurement by the analysis of a 0.4-mm thickness, 55-mm diameter circular aluminum membrane submitted to a pressure differential ranging from 0 to 90 kPa. The membrane deformation was measured with a tunable red diode laser emitting simultaneously two wavelengths. The resulting speckle image of the membrane appeared covered with interference fringes which correspond to the contour lines of the studied surface. By means of conventional fringe pattern evaluation methods like 4-stepping and unwrapping methods the membrane...
Microstructured Light Fields for Optical Trapping: Zero Order Continuous Vector Frozen Waves in the Rayleigh Regime
Vinicius de Angelis and Leonardo Ambrosio
► 15:20 · Amphitheater 2 · Lasers 2
This paper investigates, for the first time in the literature, the optical forces exerted by a new class of nondiffracting beams on Rayleigh (dipole) scatterers, envisioning applications e.g. in optical trapping and micromanipulation, atom guiding, particle sorting and so on. Such microstructured light fields can be designed to provide a wide variety of longitudinal intensity patterns along the optical (longitudinal) axis and on the micrometer scale, being constructed from a continuous superposition of Bessel beams. Coined "continuous vector Frozen Waves" (CVFWs), here we focus on their linear polarized zero-order versions, studying radial and longitudinal optical forces in situations involving different paraxiality conditions, including absorbing...
Analytical Descriptions of Finite-Energy Bessel Beams in the Generalized Lorenz-Mie Theory
► 15:40 · Amphitheater 2 · Lasers 2
The present work is a first attempt to introduce physical or finite energy axially symmetric fields, under the paraxial approximation, into the theoretical framework of the generalized Lorenz-Mie theory. Based on analytical descriptions in terms of a discrete superposition of Bessel-Gauss beams, we derive the beam shape coefficients of a particular class of axially symmetric beams, viz. truncated zero-order scalar Bessel beams. The analyticity of the present approach is interesting from the perspective that it avoids, from the very outset, extensive computational optimization processes involved in ABCD optical systems or the introduction of non-physical ideal (infinite energy) solutions of Maxwell's equations. As an example of application, optical forces...
Wednesday, October 10th
Invited Paper – LiFi – Light Fidelity
Davies William de Lima Monteiro
► 14:30 · Auditorium · Optical Communication 3
This presentation will address the concept of "1-Eye-Fi", about the possibility of communicating data with the human eye, mainly for medical diagnosis, through an intelligent intraocular lens as well as a Microelectronic CMOS Optical Receiver with robustness to saturation by light and high sensitivity).
Using an Adapted Differential Evolution Algorithm to Generate Flat Optical Frequency Combs
Guilherme Pendiuk, Alexandre Pohl and Paulo de Tarso Neves, Jr.
► 15:00 · Auditorium · Optical Communication 3
The generation of Optical Frequency Combs (OFC) by a Dual-Parallel Mach-Zehnder Modulator (DPMZM) is discussed. An adapted Differential Evolution (DE) algorithm is proposed in order to identify optimum input parameters for the modulator so that flat OFC can be generated with a certain number of comb lines. OFC with up to 25 lines are simulated and the algorithm results are discussed.
Recursive Least Squares Feed-Forward Filtering Impact on Semiconductor Optical Amplifier Electro-Optical Space Switching Performance
Tiago Sutili, Bruno Taglietti, Rafael C. Figueiredo, Rafael Ferrari and Evandro Conforti
► 15:20 · Auditorium · Optical Communication 3
The switching performance improvement of an electro-optical space switch based on a semiconductor optical amplifier (SOA) through the implementation of feed-forward filtering is experimentally evaluated. The acquired and post-processed data encompass the SOA operating under practical conditions, ranging its bias current, switching technique, and optical link. The implemented feed-forward filtering method was based on the recursive least squares (RLS) algorithm, aiming to evaluate its capacity to adapt to the SOA operational conditions, mitigating both the nonlinear SOA dynamic behavior and signal-to-noise degradation. The results showed a strong dependency on the quantity of symbols per switching cycle and the possibility to achieve a modest improvement in...
Equivalent Circuit Elements Influence on the Performance of Electro-Optical Space Switches Based on Semiconductor Optical Amplifier
Tiago Sutili, Cristiano M Gallep and Evandro Conforti
► 15:40 · Auditorium · Optical Communication 3
The electro-optical dynamic operation and performance of space switches based on semiconductor optical amplifiers (SOAs) is analyzed through computational simulations of its electric equivalent circuit. The employed circuit is well established in the literature and allows the emulation of the device behavior under several operational condition, permitting the individual impact evaluation of each SOA element in its overall performance according with the chosen characterization metrics. The results show a trade-off between the switching commutation rate and guard-time, evidencing the necessity of a careful design to achieve the desired performance, confirming previous experimental results.
Graphene-based four-port THz circulator
Thiago Oliveira, Wagner Castro, Victor Dmitriev, Francisco Diego Nobre, Marcelino Lopes Corrêa da Silva, JR. and Gabriel Felipe Barros
► 16:30 · Auditorium · Integrated Photonics 4
We propose an approach for the design of graphene based four-port circulator for THz region. The device presents a three-layer structure consisting of the layers of graphene, silica SiO2 silicon Si. The in-plane figure of the circulator consists of a circular graphene resonator and two waveguides laterally coupled to it. The device is magnetized by an external DC magnetic field normal to the plane of the resonator. The working principle of the device is based on the dipole resonance of the magnetized graphene resonator. Numerical calculations demonstrate the isolation greater than -15 dB and the insertion loss better then -3.5 dB within the bandwidth of about 4.65 % and the central frequency 5.17 THz for DC magnetic field of 0.8 T and Fermi energy eF = 0:15...
Analysing the Functioning Mechanisms and Potential Improvements Concerning Graphene-Assisted Electro-Optical Modulators
Israel Marques, Guilherme Kamiha, Giovanni Martinez and Rafael de Oliveira
► 16:50 · Auditorium · Integrated Photonics 4
Silicon photonics-based optical modulators embedded with graphene have been demonstrated operating in bandwidths ranging from 2.7 to 30 GHz. This paper examines the role that device's geometry, resistance and capacitance optimization play in increasing electro-optical bandwidth and reducing energy per bit consumption, as well as the limits concerning these improvements. Recent works report devices reaching tens of GHz of bandwidth while sporting compact footprints (µm2 range, against todays mm2 areas) and demanding low energy per bit values (sub-pJ range) for high-speed applications in the C-band of telecommunications (1550 nm).
Optimizing gold nanorods dimer structure for sensing platform
Sajid Farooq, Hafiz Mahmood, Diego Rativa, Nadège Bouchonneau, Emery Lins, Renato de Araujo and Jake Fontana
► 17:10 · Auditorium · Integrated Photonics 4
The optical features in gold nanorod (AuNR) dimer linked end-to-end by thin silica junction have been investigated qualitatively. Mathematical simulations were used on the discussion of the AuNR dimer for various silica junction lengths and NR aspect ratios contribution to local environment changes. The light-dimer interactions were evaluated by the use of finite element method (FEM) with COMSOL Multiphysics. Computational methods, focused on the assessment of the LSPR spectral peak position and spatial distribution of electromagnetic field enhancement near the AuNR dimer, were used to ascribe the behavior of crucial parameters as figure of merit and bulk sensitivity which determine the LSPR sensor performance. We find the plasmon peak position of end to...
Materials Dispersions Effects on Dielectric Nanophotonics Devices
Janderson Rodrigues and Vilson Almeida
► 17:30 · Auditorium · Integrated Photonics 4
The effects of the material dispersion can be quantified either by the Abbe number or Group Velocity Dispersion (GVD). However, we show that these traditional techniques are not well suitable to quantify the materials dispersion' effects on optical quantities in dielectric nanophotonic devices. Here, we apply classical electrodynamic theory to show that the complete description of materials dispersion properties leads to an additional term related with the materials' group indexes, which usually increases some quantities, but not others. Based on that, we define ratio factor capable of exactly quantifying the materials dispersion's effects on any optical quantity at a specific wavelength. We also find that a conservative estimative can be easily done by the...
Foundry Polymer-Based Inverted-Rib Waveguides
Gilliard N. Malheiros-Silveira, Celio A. Finardi, Eliana Van Etten, Talita Bürger, Ricardo da Silva, André Daltrini and Roberto R. Panepucci
► 17:50 · Auditorium · Integrated Photonics 4
This manuscript presents preliminary results of the development of polymer inverted-rib waveguides based on high-volume CMOS foundry. The 150 mm wafers were fabricated at The CEITEC S.A. facilities. Photomask design and manufacturing, as well as wafer post-processing were carried out at CTI Renato Archer. As preliminary results, spectral filters based on integrated ring resonators with free spectral range (FSR) of 1 nm are presented.
Study of the fabrication of pedestal based – optical waveguides for applications in nonlinear optics
Julian H Sierra Perez, Daniel Carvalho, Vanessa Gamero, Marco Alayo and Igor Abe
► 14:30 · Amphitheater 1 · Integrated Photonics 3
In this work we present all the steps for the fabrication of pedestal based – optical waveguides which use different materials with high optical nonlinearities as core layer. We show all processes to which a silicon substrate is subjected up to the moment of obtaining a final device, as well as the characterization of these guides. With the pedestal technology, it is possible to use novel materials that are highly inert to chemical etchants or alloys composed of heavy metal elements since that this technique does not require etching of the core material itself. Lateral confinement of the light bean in pedestal technology is performed through the fabrication of pedestal by Reactive Ion Etching on the lower cladding. In this case, the last step is the...
Nonreciprocal graphene-based THz dividers
Wagner Castro, Victor Dmitriev, Francisco Diego Nobre, Geraldo Melo, Marcelino Lopes Corrêa da Silva, JR. and Gabriel Felipe Barros
► 14:50 · Amphitheater 1 · Integrated Photonics 3
In this paper, we suggest and analyze nonreciprocal graphene-based dividers operating in THz region. The developed componenets divide the input signal between two or three output ports and, in addition, they possess isolation properties, i.e. the source of signal connected to the input port is protected against possible unwanted reflections in the output ports. The dividers consist of a circular graphene resonator and waveguides coupled to it. These elements are placed on a two-layer dielectric substrate of silica and silicon. The graphene resonator is magnetized normally to its plane by a DC magnetic field. The physical principle of the devices is based on the dipole resonance of the magnetized graphene resonator. Numerical simulations demonstrate that the...
Design and post-process of an integrated CMOS-MEMS IR emitter with an embedded detector
Vanessa Gamero, Pedro Amorim, Julian H Sierra Perez, Gustavo Rehder and Marco Alayo
► 15:10 · Amphitheater 1 · Integrated Photonics 3
This paper presents the design and post-process of a CMOS-MEMS IR emitter implemented in standard AMS 0.35µm CMOS process. The IR emitter is based on thermal heating of a chain of tungsten vias implemented on the Back-End-Of-Line. This heating element is protected from oxidation by SiO2 and thermally isolated from the substrate. The IR light emitted from the heating element is directed through a waveguide made of SiO2 and air used as core and cladding layers, respectively. The waveguide is connected to a photodiode used as detector, implemented in the Front-End-Of-Line. The post-process used to isolate the thermal emitter and create the waveguide was done through a maskless post-process that selectively etched of the SiO2 layers and used the aluminum film...
Radiation Diagram Control of Graphene Dipoles by Chemical Potential
Gabriel Pinto and Karlo Costa
► 15:30 · Amphitheater 1 · Integrated Photonics 3
This work presents a method of controlling the radiation diagram of a graphene dipole by the chemical potential. The dipole analyzed has rectangular geometry with power supply by voltage source in the center, where each arm of the dipole is maintained to a different chemical potential. The geometry analyzed by the two-dimensional moments method, with an equivalent surface impedance. Calculations of main radiative properties of the antenna are presented as a function of the chemical potential. The results show that the greater the difference between the chemical potentials, the greater the displacement of the main lobe of the radiation diagram.
Mach Zehnder modulator modeling based on imec-ePixFab ISIPP25G SiPhotonics
Diego M Dourado, Mônica de Lacerda Rocha and João Carmo
► 15:50 · Amphitheater 1 · Integrated Photonics 3
This paper presents the design of a modulator using a silicon photonics technology known as ePixFab ISIPP25G. By modeling a Mach Zehnder architecture, to achieve high modulation rates, and employing physical parameters and data for silicon waveguides taken from standard libraries, we demonstrate that, for a bit rate of 20 Gb/s, it is possible to dimensioning a modulator with a figure of merit equal to 0.95 V.cm to induce intensity modulation. In addition, to ensure the modulation format, an amplifier with a gain of 26 dB was inserted into the external circuit of the device. Finally, when configuring the AWG with pulse width equal to 25% of the period (square wave), it was possible to calculate the capacitive time constant (τ = 0.423 ps) and observe that the...
Invited Paper – Grooming Benefits on Designing of EON Networks: An Exact Formulation
Karcius Assis, Raul C. Almeida Jr and Alex Santos
► 16:30 · Amphitheater 1 · Optical Network 2
This work proposes a new Mixed Integer Linear Programming (MILP) formulation for traffic grooming, routing and spectrum allocation to be used in the design of Elastic Optical Networks (EON). In order to compare our method with classic Routing and Spectrum Allocation (RSA) formulation without grooming, the evaluation of the benefits of exact traffic grooming and RSA formulation are presented over three small networks. For each network, the objective function is set as minimizing the maximum slot index among all fibers. Then, the collected results show the benefits of traffic grooming in EON networks. Due to the NP characteristic of the MILP proposed, we propose a heuristic algorithm for large networks, and the benefits of the grooming using this algorithm...
An Evolutionary Method to Optimize OSNR Margin in Elastic Optical Channels Subject to Non-Linear Physical Impairments
Matheus Sena, Jose R. Mendes, Jr., Raul C. Almeida, Jr and Pedro J. F. C. Souza
► 17:00 · Amphitheater 1 · Optical Network 2
This paper proposes a metaheuristic optimization method based on Particle Swarm Optimization (PSO) that can be conveniently used to determine launch power profiles of elastic optical channels subject to nonlinear physical impairments. The method focuses on optimizing the overall OSNR margin of heterogeneous connections in a single-link network. The evolutionary method is contrasted to an analytical process widely used for WDM channels and shows a disruptive behavior to what is expected as well as a relevant gain in terms of additional propagated spans when applied to flexible-grid links.
Fairness and Efficiency in a Elastic Optical Network under Heavy Traffic
Eliezer Ferreira and Helio Waldman
► 17:20 · Amphitheater 1 · Optical Network 2
The development of the Elastic Optical Networks paradigm brings to the table the discussion of methods and policies to use the optical spectrum more efficiently. This work discusses the use of spectrum partitions to seek the most impartial operation in a single-link EON under heavy traffic.
Analysis of Multichannel Signal Transmission using a flexible spectral allocation method in Elastic Optical Networks
Felipe Rudge Barbosa, Indayara Martins and Edson José Gonçalves
► 17:40 · Amphitheater 1 · Optical Network 2
A flexible spectral allocation method is proposed and evaluated considering the impact of the number of channels on the required spectral bandwidth. The performance of elastic optical networks (EONs) is examined using a multilevel modulation format and coherent transmission. Network design parameters such as spectral bandwidth and channel symbol error rate (SER) are adopted as metrics for analysis. Transmission of quadrature phase shift-keying (QPSK) signals modulated at 56 and 100 Gbps is simulated and results for B-B, 50 and 200km are discussed.
Graphene loop antenna for THz band
Nilton Rodrigues, Victor Dmitriev and Rodrigo M. S. de Oliveira
► 14:30 · Amphitheater 2 · Photonics
A loop graphene antenna with reconfigurable operation band is proposed. The antenna consists of a ring graphene element excited by a photomixer. By modifying the chemical potential of graphene, the device can operate at multiple frequencies in THz band. The maximum of the antenna total efficiency occurs near to its second resonance frequency. The fractional bandwidth of the proposed device can be changed from 4.44% (2.2-2.3 THz) to 21.11% (2.67-3.3 THz). The loop antenna is also compared with a graphene dipole antenna.
Plasmonic Nanoantennas For Solar Cells With Improved Efficiency
Marcelino Lopes Corrêa da Silva, JR., Victor Dmitriev, Karlo Costa, Wagner Castro, Geraldo Melo and Francisco Diego Nobre
► 14:50 · Amphitheater 2 · Photonics
This work shows a theoretical nanoantennas study about organic solar cells, occasioning the increase in the efficiency of light absorption. The unitary organic solar cells formed by a reflector silver block, an active layer formed by the semiconductor P3HT:PCBM and a nanostructure, also made of silver. The numerical analysis of the device is made through the Finite Element Method; the materials are analysed from the relative permittivity. Firstly, we executed the validation of the nanostructure through the numerical method. Then, we apply the geometric optimization process in the other nanoantenna models. This optimization process was based on nanostructures geometrical parameters preserving its superficial area. Since were considered four new models of...
THz Electro-Absorption Modulator
Gabriel Fré, Danilo Spadoti and Felipe Mejía
► 15:10 · Amphitheater 2 · Photonics
This paper discusses the feasibility of electro-absorption modulator to operate at THz spectral region, using high losses materials and alloys that are usually applied for telecommunication engineering. Low loss structure based on slot waveguide is proposed for propagating THz waves. The numerical simulated results show that the maximum carrier amplitude reduces to half of the input value in less than 10λ_THz long with a silicon quantum efficiency higher than 90%.
Synthesis and Optical Characterization of Terfenol-D Nanoparticles
Rafael Nadas, Thiago Neves Machado, Jorge Lenz, Wido Schreiner, Arandi G Bezerra, Jr. and Ricardo Kamikawachi
► 15:30 · Amphitheater 2 · Photonics
We report on Terfenol-D nanoparticle (TDNP) production by Laser Ablation Synthesis in Solution (LASiS). Nanoparticle shape and size distribution were analyzed by Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS). Colloidal optical properties were studied by means of UV-Vis spectroscopy, and Raman scattering. The nanoparticles present a spherical shape with average size of 17 nm. Interesting results have been found regarding absorbance peak shift in the UV-Vis experiment, a dependence on colloidal suspension concentration. A surface enhanced Raman spectroscopy (SERS) of the amino acid Proline (Pro) using TDNP as substrate was performed and compared with previous studies. An expected intensification on several Proline peaks was...
Spectral Analysis of a Surface Plasmon Resonance Sensor of Nanoparticles by Periodic Green Function
André Felipe Souza da Cruz, Karlo Costa, Victor Dmitriev and Tommaso Rosso
► 15:50 · Amphitheater 2 · Photonics
In this paper, we present a spectral analysis of a surface plasmon resonance sensor (SPR) by the Periodic Green Function (PGF). The SPR sensor is in the Surface Plasmon Coupled Emission (SPCE) configuration, and it is coupled to a planar array of gold nanoparticles (AuNps) of core-shell type. These AuNps are represented by a periodic array of nanodipoles, and the PGF of the problem is obtained by the two-dimensional complex Fourier series. We performed a parametric analysis of the influence of AuNps concentration on the electromagnetic fields, and the generalized reflection and transmission coefficients, in the spectral domain. Also, the surface wave and surface plasmon polariton poles are investigated. Finally, some discussions about the convergence of the...
Juliano R. F. de Oliveira
16:30-18:10 / Amphitheater 2
Optical Fiber Chemical Sensor Based on the Analysis of Fiber Specklegrams Characteristics
Eric Fujiwara, Luiz da Silva, Hugo de Freitas, Yu Tzu Wu and Cristiano MB Cordeiro
► 16:30 · Amphitheater 2 · Optical Sensors, Image and Illumination 2
An optical fiber chemical sensor based on the analysis of the projected specklegram characteristics is presented. The multimode no-core fiber is surrounded by the assessed liquid, causing the modulation of the number of modes and the average speckles size. The sensitivity is improved for external refractive indices close to the fiber index as well as for smaller core diameters, so the sensor response can be tuned by properly choosing the fiber dimensions and material.
Computational Modeling of H2S Gas Sensor Using Surface Plasmon Resonance in a D-Shaped Optical Fiber
Hebio Oliveira, Joaquim F. Martins-Filho and Jehan Nascimento
► 16:50 · Amphitheater 2 · Optical Sensors, Image and Illumination 2
The development of optical sensors and biosensors for the detection of substances of chemical and biological interest has increased considerably, and fiber optic sensors are ideal for applications in harsh environments. Hydrogen Sulfide (H2S) is a toxic gas at room temperature, with corrosive, flammable, colorless and strong odor characteristics. In this work we propose and analyze an H2S gas sensor device that uses the surface plasmon resonance effect (SPR) on a D-shaped optical fiber with metal and metal-oxide layers. We perform the characterization of the device through computer simulations with COMSOL Multiphysics software. The results of the simulation are compared with an approximate analytical model, which makes use of the Fresnel equations. The...
Spherical Plasmonic Structures for Solar Absorption
Sajid Farooq, Luis Malagon, Renato de Araujo and Diego Rativa
► 17:10 · Amphitheater 2 · Optical Sensors, Image and Illumination 2
Direct Solar Absorption Collectors explore the thermo-optical properties of different absorber fluids to convert solar radiation into thermal energy. Colloids of metallic nanoparticles (or nanofluids) have shown a high potential to convert solar radiation into thermal energy efficiently; it is due to the possibility to tune the plasmon resonance next to the near infrared region and a high thermal conductivity coefficient. Different complex structures such as triangles, pyramids, octahedral, hollow-structure have been proposed theoretically for this purposes; however, to synthesize this kind of nanoparticles is not a straightforward method, requiring strong reducing agents and usually, a broad particle polydispersity is obtained. In this work, using a...
Optical Fiber Sensor as an Alternative for Colorimetric Image Processing for the Assessment of Dye Concentration
Marco Soares, Beatriz Mendes, Matheus Gomes, Rogério Bataglioli, Egont Schenkel, Franciele Vit, Lucimara de La Torre, Eric Fujiwara and Carlos Suzuki
► 17:30 · Amphitheater 2 · Optical Sensors, Image and Illumination 2
Methylene blue is a dye commonly applied in chemical reactions and as a dye model for the study of purification processes. In this research, solutions of methylene blue-ethanol-water were evaluated with an optical fiber reflectometer and with a image-based colorimetric system. Then, silica nanoparticles synthesized by vapor-phase axial deposition were tested for separation processes, being evaluated in relation to their capacity in adsorving methylene blue The fiber sensor and the colorimeter presented 0.419 L.mg-1 and 0.596 L.mg-1 sensitivities, respectively, and yielded equivalent results, demonstrating that the fiber approach can be utilized as a more robust alternative to the colorimetric method.
Characterization of Colloidal Silica by Optical Fiber Sensor
Eric Fujiwara, Matheus Gomes, Marco Soares, Matheus Rodrigues, Egont Schenkel and Carlos Suzuki
► 17:50 · Amphitheater 2 · Optical Sensors, Image and Illumination 2
The assessment of silica nanofluids properties by an optical fiber sensor is reported. The effect of particles concentration and size was analyzed by dynamic light scattering, making it possible to estimate the sample properties from the decay rate. Moreover, the nanofluids were subjected to controlled heating, so the thermal conductivity and refractive index variations could be inferred from reflected intensity and autocorrelation signals.
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