Photonic Properties
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Analysis of the Propagation Properties of 90°-bend Periodic Segmented Waveguides Using the 2D Finite Element Method
Abstract We use the two dimensional finite element method (2D-FEM) in the frequency domain to characterize the transmission properties of 90°-bend periodic segmented waveguides (PSWs). We investigated the dependence of the transmission coefficient and the mode profile of PSWs on the bending radius, the waveguide duty cycle, and the operating wavelength. We
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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2. Design and Modal Analysis of Photonic Crystal Fiber for Dispersion Compensation over Broadband Range
Abstract In this paper we have presented the four new investigations using different structures of Photonic Crystal Fiber (PCF) for broadband communication applications and narrows down on the design which can provide largest flat negative dispersion. The new structure model is optimized based on the combination of modal properties and dispersion compensatio
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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3. MATERIAIS VÍTREOS E LUZ: PARTE 2
In this second part it will be discussed some photonic applications of glassy and glass ceramic thin films which can be used as planar waveguides. Some photonic applications require certain specifications of glass, which can be quantified by studying the nonlinear optical properties of the materials. Therefore, a brief introduction of these phenomena is disc
Quím. Nova. Publicado em: 2016-04
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4. MATERIAIS VÍTREOS E LUZ: PARTE 1
2015 is the Year of Light, according to UNESCO. Chemistry has a close relationship with light and one of the materials that allows such synergy is glass. Depending on the chemical composition of the glass, it is possible to achieve technological applications for the whole range of wavelengths extending from the region of the microwave to gamma rays. This div
Quím. Nova. Publicado em: 2016-04
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5. Enhancement of Optical Absorption, Photoluminescence and Raman Transitions in Bi2O3-GeO2 Glasses with Embedded Silver Nanoparticles
The influence of silver nanoparticles (Ag-NPs) on the optical properties of Bi2O3-GeO2 glasses was investigated aiming the characterization of their potential for applications in photonic devices. The samples were prepared by the melt-quenching technique starting from high purity oxides (GeO2, Bi2O3 and AgNO3). Heat-treatment during different times was perfo
J. Braz. Chem. Soc.. Publicado em: 2015-12
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6. Near Infrared Emission at 1000 nm from Nanostructured Pr3+/Yb3+ Co-doped SiO2-Nb2O5 for Solar Cell Application
Energy conversion, involving UV and Vis absorption to generate near infrared (NIR) emission at 1000 nm from nanostructured Pr3+/Yb3+ co-doped SiO2-Nb2O5 for solar cell application was the main focus of this work. The synthesis, structural and optical characterization of Pr3+/Yb3+ co-doped 70SiO2-30Nb2O5 nanocomposites and planar waveguides prepared by the so
J. Braz. Chem. Soc.. Publicado em: 2015-12
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7. NIR Luminescence from Sol-Gel Er3+ Doped SiO2:GeO2 Transparent Gels, Nanostructured Powders and Thin Films for Photonic Applications
Samples of (1 – x)SiO2:xGeO2 compositions, containing x = 10 and 20, and doped with Er3+, were prepared by a simple sol-gel route. Homogeneous and transparent gels were synthesized and xerogels were obtained by gel annealing from 700 ºC to 1100 ºC. Films exhibiting high transmittance in the visible and near infrared were deposited by spin-coating techniq
J. Braz. Chem. Soc.. Publicado em: 2015-12
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8. A new circular photonic crystal fiber for effective dispersion compensation over E to L wavelength bands
This paper presents a new circular photonic crystal fiber (C-PCF) for effective dispersion compensation covering E to L wavelength bands ranging from 1360-1625 nm. To investigate its guiding properties, finite element method (FEM) with a perfectly matched layer absorbing boundary condition is used. From our numerical simulation, it is found that the designed
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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9. Acopladores de cristais fotÃnicos e acesso mÃltiplo por divisÃo de cÃdigo Ãptico (OCDMA) com pulsos ultracurtos em fibras de Bragg / Photonic crystals couplers and optical code division multiple access (OCDMA) with optical ultra-short pulses in linear fiber Bragg gratings
This paper presents numerical simulation studies of propagation/switching of ultra-short pulses in photonic crystal couplers and Optical Code Division Multiple Access (OCDMA) using Fiber Bragg Grating (FBG). For coding were obtained analytically Gold codes. In the analysis of photonic crystal couplers (microstructured) investigated the properties of the prop
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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10. Comparative study of fundamental properties of honey comb photonic crystal fiber at 1.55µm wavelength
Fundamental properties such as mode field distribution, real effective refractive index, imaginary effective refractive index, confinement loss of two new kinds of honeycomb photonic crystal fibers are successfully studied by using Full-Vectorial Finite element method (FV-FEM). Low confinement loss 0.1×10-4dB/km is achieved at wavelength 1.55µm in hollow c
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-12
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11. Um novo método para síntese de vidros fotônicos baseado na sinergia entre as técnicas VAD e ALD / A new method for synthesis of photonic glasses based on the synergy between VAD and ALD techniques
This study aimed to establish a new method for synthesis of photonic glasses through the synergy of Vapor-phase Axial Deposition (VAD) and Atomic Layer Deposition (ALD) techniques. Having the intention to obtain a completely transparent material containing a uniform distribution of dopant element both radial and axial position. In the first stage of this stu
Publicado em: 2011
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12. Propagação não linear de pulsos em estruturas 1D com band gap fotonico / Nonlinear pulse propagation in one-dimensional photonic band gap structures
The interaction of ultrashort optical pulses with photonic band gap materials has been studied by considering light propagation through one-dimensional photonic band gap structures, composed of a periodic multilayer stack of dielectric materials whose unitary cell consists of a pair of layers with different refractive indices n1and n2, respectively. One of t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2009