Tuesday, OCTOBER 8th
14:00—15:30 / Hall
Plasmonics and SERS activity: beyond gold and silver
Thiago Neves Machado, Rafael Nadas, Juliana Thaler, Lucas Feitosaand Rafael Eleodoro de Góes, Ricardo Kamikawachi, Jorge Lenz, Wido Schreiner, and Arandi G Bezerra, Jr.
The search for new plasmonic nanostructures has received significant attention recently, owing to applications in diverse fields of nanoscience and nanotechnology, and being of particular interest for the life sciences. Metallic nanoparticles (NP) can strongly absorb and scatter light due to their ability to support localized surface plasmon resonances (LSPR) and, therefore, play an important role in plasmonic-based techniques such as surface enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF). Interestingly, most research in the field is still confined to Ag, Au, and less intensively Cu nanostructures, and there is an open field for the investigation of other elements such as the poor metals. In this work, we investigate plasmonic...
Multimode Photonic Biosensor Based on Cascaded Ring Resonator with Mach-Zehnder Interferometer for Vernier-Effect Refractive Index Sensing
Adolfo Fernandes Herbster, Barbara de Oliveira, and Wender Daniel
In this paper, a novel photonic integrated biosensor based on the cascaded architecture of a Mach-Zehnder interferometer with a ring resonator, enhanced by the Vernier effect, is proposed employing a multimode waveguide. Some aspects of the silicon photonic sensors based on the evanescent field sensing principle are reviewed. The sensibility of the first four propagating modes (TE00, TE01, TM00, and TM01) is individually investigated in order to explain their influence on the overall device's sensibility. Supported by results obtained from numerical simulations around the wavelength of 1.55 µm, the proposed sensor is demonstrated to reach a high refractive index (RI) sensing performance such as wavelength sensitivities of 10772.50 nm/RIU, 26500 nm/RIU,...
Cell lines molecular classification by FT-IR spectroscopy using the Recurrence quantification analysis (RQA) technique
Ricardo Kamikawachi, Leticia Powrosnek, Jose Carlos Coninck, Rafaela Veigaand Jaqueline de Oliveira, and Marcelo Antoniassi
In this work, we verified how Recurrence quantification analysis (RQA) can help and improve the analysis of profiles and patterns in the cell lines spectra obtained by Fourier transform infrared (FT-IR) vibration spectroscopy. The results show that the recursive pattern differs among the MCF7, MDAMD-231 and BT-474 cell lines. Quantitative recurrence analysis presented consistent results with the biology of breast cancer. The molecular subtype of greater aggressiveness (MDA-MB-231) obtained greater laminarity and rate of recurrence and less determinism while the sample of subtype Luminal B (BT-474), obtained the lowest laminarity and rate of recurrence but with greater determinism. The Luminal A subtype (MCF7) presented intermediate values when compared to...
Facile synthesis of gold nanoparticles using Mimusops coriacea leaves extract
Lilia Courrol, and Carla Lopes
Gold nanoparticles have attracted great interest from the scientific community in recent years due to its large number of applications in various science areas. The green synthesis process shows a sustainable alternative and aims to use biological organisms to replace chemical reagents. In this work gold nanoparticles (AuNP) were synthesized with the aqueous extract obtained from leaves of Mimusops coriacea (McAuNP). Synthesized nanoparticles were characterized by different techniques, such as UV-Vis; fluorescence; FTIR; transmission electron microscopy (TEM); dynamic light scattering (DLS) and Zeta potential. Variations in the pH of the medium, concentration of the reagents and pH were applied, aiming to optimize the synthesis processes. The method to...
Geometric Characterization of Conical Lensed Optical Fibers
Alexandre Felipe, Jorge Herrera, and Adriana Caceres
This paper presents an interdisciplinary work in which image processing is employed to characterize microlensed fibers. The geometric parameters of a microlens are determinant to reduce the modal diameter of the standard fiber and make it compatible to the photonic chip, increasing coupling efficiency. The presented characterization method uses the video output of a splicing machine. The method was evaluated using commercial microlenses and is shown to be sufficiently sensitive to detect differences in the fiber geometry due to fabrication process variability. Furthermore, the measures are shown to be strongly correlated to the beam waist size.
Femtosecond Laser Micromachining for Controlling Surface Wettability
Kaue L. C. da Silva, Kelly T. de Paula, Alexia V. A. Mattos, Adriano J. G. Otuka, Rafaela C. Sanfelice, and Cleber R. Mendonca
The use of femtosecond laser to modify the surface of polymeric materials has received great attention in the last decade, due to the possibilities of tailoring the material's properties yielding technological applications. Here, we report on the microfabrication of an azopolymer by using femtosecond laser pulses, aiming at the control of surface wettability. By properly patterning the polymeric surface structure we were able to increase the surface hydrophilicity, decreasing the water contact angle in about 20 degrees.
CMOS-Compatible Graphene-based PAM-4 Modulator
Mauricio Moderno Carvalho, Lúcia Saito, and Thoroh Souza
In this work, we present an electro-absorption modulator in the PAM-4 format based on graphene capacitive segments. Numerical simulations performed by the finite element method were used to determine the dimensions of the waveguide, the materials employed and the level of voltage necessary for the correct absorption of light by the graphene. The results of our device show the operation bit rate of 68 Gbps for an operating voltage of 1.4V (CMOS-compatible) and 200 Gbps at 4.4 V (TTL-compatible), both obtained at an extinction ratio (ER) of 6 dB.
Fabrication and characterization of silicon nitride waveguides for mid-infrared applications
Emerson C de Oliveira, Rodrigo Gerosa, Christiano de Matosand Ciaran F. Phelan
This work describes the fabrication and characterization of silicon nitride waveguides for operation in the 2 µm to 3 µm range. Fabrication was carried out via PECVD and lithography techniques. Transmission losses were measured, with a tunable laser, to be ~17 dB between 2 µm and 2.2 µm, increasing to ~30 dB between 2.3 µm and 2.6 µm. Beyond 2.8 µm no transmission was detected, possibly due to the presence of hydrogen in the silicon nitride material (leading to absorption). Losses in the 2 µm to 2.6 µm range are believed to be a consequence of scattering, as the waveguides presented an RMS roughness of ~5 nm. Future work will focus on reducing these sources of absorption and scattering so that operation can be extended to the 4 µm range.
Graphene Coplanar Capacitor
Matheus Bonando, and Sérgio Adriano Gimenes, Juniorand Lúcia Saito
We present an all-fiber graphene electro-absorption optical modulator built onto a side-polished optical fiber in a coplanar capacitor configuration. For a maximum PMMA superstrate thickness of 1 µm, the analysis presents a modulation depth of 7.8 dB/mm and maximum capacitance of 98.4 fF/mm. The contribution of this work is to demonstrate a low capacitance design with an optimized process fabrication for optical modulation.
Compact SOI Waveguide Crossing for TE0 and TE1 modes
Adolfo Fernandes Herbster, and Ana Paula de Melo
The photonic waveguide crossing structure must be used in the integration of photonic circuits on a high scale and high volume. Therefore, the footprint of this structure needs to be small with high efficiency. To present a structure that meets these requirements, a waveguide crossing with a small footprint only 5.5 µm2 will be proposed in a silicon-on-insulator platform that has efficient multi-mode transmission based on an elliptical structure with four points of intersection and four small symmetrical bus structures in the footprint. This design allows it to achieve lower crosstalk and lower insertion loss for both TE0 and TE1 modes. The simulation was performed for both modes across the whole C-band. Our simulations show that it has a low insertion loss...
New optical marker from polyamide (PA) doped with Eu3+ beta -diketonate complex
Duclerc Fernandes Parra, and Leonardo Marchini
Summary: We report photoluminescent properties of the europium tris(thenoyltrifluoroacetonate) (dihydrate) [Eu(tta)3(H2O)2] doped into polyamide (PA) films with doping percentage at 1, 3, 5, 7 and 10% (mass). The polymer films and the Eu3+ complex precursor were characterized by infrared spectroscopy (IR), X-Ray difratometry (DRX), emission spectroscopy and thermogravimetry (TGA). Electronic spectroscopy study was conducted at room temperature (298K). The emission spectra of the Eu3+- tta complex doped in the PA exhibited the characteristic bands arising from the 5D0 -> 7FJ intraconfigurational transitions (J = 0-4). Lifetime measurement suggests that doped Eu3+ ion has higher luminescence efficiency in the film than hydrated complex. The emission...
Radiation-pressure induced Optical forces in Silicon Nanowaveguides
Janderson Rodrigues, and Vilson Almeida
This work describes radiation-pressure induced optical forces acting within silicon nanowaveguides, aiming to the scientific understanding of the physical concepts behind them, in order to achieve the appropriate design and the technological approaches for practical and efficient devices. We apply the Minkowski stress tensor formalism to a dielectric planar waveguide, in order to compute the optical forces exerted on the surfaces of a single waveguide by the eigenmodes' radiation pressures. By using Maxwell's equations, the Poynting vector, and the boundary conditions, we analytically prove that the energy-based methods, as Dispersion Relation, the Response Theory of Optical Forces, and the Scaling law, are indeed equal to the Stress Tensor method....
Periodic structure of chalcogenide glass fabricated via laser induced forward transfer: finite element simulation
Filipe Couto, Juliana Almeida, Nathalia B Tomazio, Franciele Henrique, and Cleber R. Mendonca
Photonic crystals are structures that present a spatial periodic profile of the dielectric and have been shown as a promising option for the development of integrated photonic devices because. In this work, the band structure of a periodic pattern fabricated using the Laser Induced Forward Transfer (LIFT) technique on a chalcogenide glass was analyzed from a theoretical point of view, as to explore the possibilities of using such structure as a photonic crystal. It was found a photonic band gap in the visible spectrum, between 582 and 639 nm for TM polarized light according to the periodic plan of the structure. Also, the behavior of the structure as a waveguide was analyzed through Finite-Difference Time-Domain method, and the guiding as a function of the...
Effects of photodynamic therapy on materials used in hospitals
In the hospital environment, the disinfection and sterilization of medical devices are essential, and the development of efficient techniques with low cost and absence of collateral effects is still necessary. The photodynamic therapy (PDT) is a successful technique for treating infections caused by different microorganisms, but nothing is reported about the effects of PDT on materials often employed in hospitals. In this way, this in vitro study aimed to verify the actions of PDT on polypropylene, aluminum and Aisi 304 steel taking into account the following aspects: cytotoxicity, mechanical properties and effects on bacterial biofilms. For that, this study was splitted into three experimental phases. In the first one, 27 samples of each proposed material...
Thermal Blooming in Optical Tweezers
Antonio A. R. Neves, Partha Patra, Qiwei Li, Alessandro Magazzù, Mikael Käll, and Giovanni Volpe
Water near an optically trapped particle absorbs part of the laser energy resulting in changes for the refractive index and density. Particle position and optical potential description are affected by this photothermal effect.
Fabrication of cylindrical resonant microcavities using the confinement provided by partially oxidized AlGaAs/GaAs layers
Gustavo Adolfo Palomino Marcelo, Pedro Vinicius Pinho Nascimento, Ailton José Garcia, Jr., Christoph Deneke, and Newton C. Frateschi
Two different interfaces for optical confinement in GaAs resonators are compared (air/GaAs/air, air/GaAs/AlOx ) in cylindrical microstructures with 10um, 20um, 30um and 40um diameter. The AlOx is obtained by the lateral oxidation of Al0.9GA0.1As layers. The spectrum of the resonators is obtained using a tapered fiber system in the wavelength range of 1470 nm to 1610 nm. The modal separation agrees with our simulation. The quality factor for cylindrical microstructures with air/GaAs/air interface is almost twice the case with AlOx interface. Since it is expected that surface recombination velocity is reduced by a factor of ten for this last case, these structures are shown to be suitable for active resonators.
Experimental Characterization of Remote Optically Pumped Amplifier
Tiago Sutili, Pedro Pinto Neto, Fábio D. Simões, Sandro M. Rossi, Gabriel Suzigan, and Rafael C. Figueiredo
The performance of a remote optically pumped amplifier (ROPA) was experimentally characterized, allowing to analyze the impact of operational and constructive parameters on the amplification of a set of 20 channels wavelength multiplexed occupying the extended C-band. With the support of simulations reproducing the experimental setup, the influence of the pumping and signal input power, the doped fiber length, and the Erbium saturation factor were analyzed. Additionally, a simple optimization methodology to reduce the splice loss between fibers with dissimilar mode field diameters (as the Erbium-doped and the standard single-mode fibers) was presented. The results allowed the inference of some ROPA operational properties on unrepeatered optical links, which...
Impact of deterministic and random jitter in a PDM-64QAM, 64-GBd coherent transmission
Lucas Silva Schanner, and André Souza
We analyzed the performance of a 64QAM 64-Gbaud coherent transmission with respect to the random and deterministic jitter components. Simulations assumed a back-to-back transmission with noise loading, considering impairments such as transmitter and receiver lasers linewidths and bandwidths. We considered the effects of different root mean square (RMS) values of each jitter component separately and of linear combinations of both. In the separate scenario, similar results were observed for both components at low RMS values (>3% of the symbol period). For higher values, the system is more impaired by the deterministic jitter. Additionally we verified a higher sensibility for jitter in analog-to-digital converters (ADCs) compared to digital-to-analog...
Error-Free Semiconductor Optical Amplifier Wavelength Conversion of 32-GBd 4-QAM Optical Carriers
Peterson Rocha, Tiago Sutili, Sandro M. Rossi, Cristiano M Gallep, and Evandro Conforti
The wavelength conversion of 4-QAM modulated optical carriers is achieved for small input powers (<-15 dBm) and symbol rates of 32 GBd using a highly nonlinear semiconductor optical amplifier (SOA). The degenerated four-wave mixing (FWM) phenomena was used avoiding secondary FWM products and gain saturation. Error-free operation was achieved with negligible penalties employing conventional digital signal processing (DSP) algorithms for signal recovering, demodulation, and analysis.
Proposal of a ROADM architecture for an elastic optical network based on O-OFDM
Mônica de Lacerda Rocha, Rafael Ferreira, Diego M Dourado, Feres, and Daniel M Pataca
We propose a reconfigurable optical add/drop multiplexer (ROADM) architecture for an elastic optical networks (EON) that allows the traffic of all optical orthogonal frequency division multiplexing (O-OFDM) signals. This new ROADM setup is validated by a point-to-point simulation of 100 Gb/s 4-subcarrier O-OFDM signals traveling through an 8-node mesh network with add/drop operation in all nodes along their optical paths.We propose a node architecture for an all optical OFDM ROADM operation in a mesh network.
General formulae for freeform collector lens design free of spherical aberration and astigmatism
Rafael G. Acuña-Gonzalez, and Julio C. Gutiérrez-Vega
An analytical closed-form formula for the design of freeform collector lenses free of spherical aberration and astigmatism is presented. Given the equation of the freeform input surface, the formula gives the second surface to correct the spherical aberration and the astigmatism.
Using the Smartphone as an Ubiquitous Platform for Implementing Optical Fiber Sensors
ric Fujiwara, Pedro Machado, Tarcisio Oliveira, Marco C P Soares, Thiago D Cabral, and Cristiano MB Cordeiro
This paper reports the development of a low-cost kit to turn smartphones into versatile platforms for interrogating optical fiber sensors. The adapter for connecting the fiber to the phone camera was 3D printed, whereas the application software was programmed for Android(TM) operating system. Different types of sensors based on multimode fiber and LED source were tested. The resolutions for the microbending displacement sensor, the fiber reflectometer, and the macrobending temperature probe are 26 um, 0.0006 RIU, and 3.9°C, respectively. In addition to a didactic kit for photonics classes, the proposed device can also be used as a portable sensor for multiple purposes since the transducer modulus can be exchanged to assess different physical and chemical...
Study of different organic solvents used in PFTB emission material for OLEDs devices
Emerson Santos, Hudson Ramos, Elvo C Burini, Jr., Roberto Onmori, and Wang Hui
In this work, the light emitting layer of OLED devices were mounted using the structure: glass (as substrate)/ITO (as anode)/PEDOT:PSS (as HTL)/PFTB (as emitter)/AZO (as ETL)/Al (as cathode). The PFTB was synthetized at laboratory and diluted in organic solvent as chloroform and trichlorobenzene. It was verified that the trichlorobenzene provided greater performance for the OLED devices, in addition, the electric current was most higher presenting lower threshold voltage. A hypothesis to obtain these results is that the boiling point of the solvent trichlorobenzene (≈ 214,4 ºC) is much higher than that of chloroform (≈ 61,1 ºC) favoring a greater and better rearrangement of the polymer layers and thus facilitating greater locomotion of the charge carriers.
The Brazilian Photonics Society has begun its activities on May 24th, 2017 with the main objective to work for increasing the importance and awareness of optics and photonics in Brazil and South America.
To contact SBFoton and take active part in this movement, send an email to email@example.com.
This event’s visual identity was designed by Preface.