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In this paper, we mainly focus on the characteristics of photo-activated phase shifters employing the organic semiconductor. Organic semiconducting polymers have been the focus of many studies on optically controlled technology because of their optics absorption, flexibility and plasticity properties. The photonic devices particularly are driven by the need for dynamic control, fast response, immunity...
The optical properties of porous SiGe/Si multilayer films prepared through electrochemical anodization have been investigated. The visible luminescence spectra with multiple emission peaks have been detected in the temperature range from 10 K to room temperature. Photoluminescence (PL) with narrow band width is observed due to the wavelength selective effect of the microcavity. The resonance of the...
Abstract-The signal-to-noise ratio (SNR) and spatial resolution are conflicting factors in conventional Brillouin optical time domain reflectometer (BOTDR) system. Golay complementary sequence with good autocorrelation properties, can be used as probe pulse, in order to achieve a higher SNR without compromising the spatial resolution of the system. This paper discusses the composition method of Golay...
we present a novel method to remove the specular reflections on the surface of transparent plastic film. Our approach uses four light sources with strategic positions to get four images. Based on the information that both reflection and shadow move a lot from image to image, we reconstruct a high quality image free from reflection and shadow by using a image set which is consist of four images.
In SLM, a high energy density is applied by a laser to locally melt layers of metallic powder particles in order to create functional parts. This high energy intensity and additive process character create a specific/unique microstructure. The solidified melt pools in HSS M2 SLM parts are observed to consist of two distinct zones next to the heat affected zone. The first zone, at the bottom of the...
A fiber optic AE sensor system based on over-coupled fused coupler (OCFC) and intensity modulate principle is investigated to detect power transformer partial discharge effectively. The principle of a sensing heads based on OCFC for detection of acoustic emissions in power transformers is illustrated. The theory and experiment results of fiber optic AE sensor based on OCFC is described, the transmission...
In this paper, the limitation in stokes parameter measurement based on single optical road and four optical roads of fiber bragg grattings was analyzed. From emulating, we proposed a new measurement method for stokes parameters based on three optical roads and analyzed the angle measurement errors of stokes parameters caused by the polarizer.
A new unsymmetrical photochromic diarylethene, 1-(2-methylpyridine)-2-[2-methyl-5-(3-cyanophenyl)-3-thienyl]perfluorocyclopentene(1a)was synthesized and its photochromic and fluorescent properties were investigated. It underwent reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and the Diarylethene 1a changed...
A novel photochromic diarylethene with thiophene and benzene compound, 1-{[2-methyl-5-(formyl)-3-thienyl]}-2-(2-methylphenyl)perfluorocyclopentene (1a) has been synthesized for the examination of its properties including photochromism, fluorescence properties and optical recording. Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption...
A new photochromic diarylethene compound, 1-(2-methylpyridine)-2-[2-methyl-5-(3-methoxylphenyl)-3-thienyl]perfluorocyclopentene(1a) was synthesized. its photochromic and fluorescent properties have been investigated in detail. While, fluorescence properties in different solution have also been discussed. The results of the research demonstrated that it has shown good photochromic behavior and relatively...
A numerical model for semiconductor laser diodes that predicts laser performance in high speed optical interconnect applications has been developed. The model is based on the temporal numerical simulation of the rate equation for semiconductor laser diodes. The popular math package MATLAB has been used to simulate the dynamic behavior of carrier and photon density. The term turn on delay time is defined...
Using two dimensional FD method, we analyze the effects of photonic crystal parameters on threshold current in photonic crystal vertical cavity surface emitting laser. Results show that threshold current increases with PC holes diameter and decreases with pitch.
Raman spectroscopy with optical fibre probes, a kind of vibrational spectroscopy providing detailed information about molecular composition and structure of tissues. The great appeal of Raman spectroscopy lies in its potential for in vivo applications and its ability to therefore direct real-time therapeutic intervention. Objective: The purpose of this study was to discuss optical fibre probes for...
This article presents the reflectance profilometer, which was designed and constructed in Institute of Optoelectronics of Military University of Technology. The reflectance profilometer is an optoelectronic device based on the laser remote sensing technique. The profilometer fundamental function is to define a shape of terrain along with an identification and analysis of elements of its coverage,...
Some molecular hyperspectral images of retina sections were collected. Due to the infection of lamp, a spectral curve extracted directly from the original hyperspectral data can not truly present biochemical character. The main preprocessing step of the hyperspectral data is radiometric correction. The paper provides the gray correction coefficient algorithm to eliminating the influence. Because hyperspectral...
For the features of the optical transmission in photonic crystal fiber the minimum roots of mean square search method was proposed. The minimum root-mean -square search method was used to estimate the deviation between the theory of the Localized Basis Functions Method and experimental result of optical transmission in photonic crystal fiber. The experimental result was the light intensity distribution...
CO2 laser (wavelength 10.6 μm) has important applications in laser surgery, material processing, infrared sensors and imaging. CO2 laser optical waveguides are gaining a central position in these applications. Glass-drawing technique and sol-gel methods have been used to prepare GeO2 and germania-based glass hollow waveguides. In this work, a GeO2 glass hollow waveguide sample was fabricated by using...
Abstract-the 3D integration and packaging of semiconductor devices has gone through a paradigm shift over the last decade. The 3D technology outperforms conventional semiconductor assembling methods in density, cost, and performance simultaneously. This paper summarizes characteristics,platforms, approaches, and trends in 3D semiconductor optoelectronics.
Continuous phase filters have been investigated to use to control three dimensional light intensity distribution around the focus. With the use of super-resolution theory the light intensity distribution of the continuous phase pupil is simulated and the results in both transverse and axial direction are presented. The impact of the structure parameters of continuous pupil a and b on the resolution...
In this paper, we extend a new registration framework from scalar image to diffusion tensor image. As the extension from scalar to tensor image is non-trivial, we write the process in detail. The registration framework is based on polynomial expansion transform. The idea of polynomial expansion is that the image is locally approximated by polynomials at each pixel. Registration algorithms are developed...
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