Materials Literature
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Nd doped glasses with chemical composition of 48.5P2O5-30CaCl2-20NaCl-1.5Nd2O3 were prepared by furnace melt method. Glass-ceramic samples, containing Ca (PO3)2 nano crystals with mean size 60 nm prepared from precursor samples. Absorption spectrum of Nd doped samples were taken in the wavelength region 200-1000nm at…
In this paper fabrication of a holographic blazed grating coupler on polymeric films is presented. This experiment was implemented with 532nm laser with a peak power of 150mw. The volume grating coupler was fabricated using an all optical technique based on cis-trans isomerization property of azo chromophores. After i…
In this paper we describe the optical and fluorescence features of metal nanoparticles by analytical model based on fundamental quantum mechanical principles. Here, we examine the plasmonic property of gold nanospheres with radii range from 10 to 1 (extending from classical to quantum regime). Electrical permittivity…
In this experiment, the semiconducting Cu3N films were deposited on glass substrates by reactive Direct Current Magnetron Sputtering in a mixture gas of Nitrogen and Argon. The influence of nitrogen content in a fixed total sputtering gaz flow on the preferential crystalline orientation, the morphology, the conductivi…
In this paper, by simulating the nitrogen oxides (NOx) exhausted from diesel engines, the effect of electrode material in the dielectric barrier discharge reactor is studied in order to increase the NOx removal efficiency. Three different materials of the inner electrodes are examined. First, the results show the capa…
In this paper, Laser ablation of magnesium in Isopropanol using a pulsed copper vapor laser has been reported. The structure, morphology, and optical absorption of the resultant obtained structures were investigated by X-ray powder diffraction, scanning electron microscopy, IR absorption spectroscopy. The obtained res…
The electro-optical properties of BNT and BNZ compounds were studied in density functional theory (DFT) frame using full potential and linearized augmented plane wave (FP-LAPW) and generalized gradiant approximation (GGA). The electronic and optical gaps of BNT were obtained 1.9 eV and 2.2 eV respectively; but in BNZ…
In this study, using laser induced fluorescence technique, the fluorescence spectrum of crystalline natural stones such as emeralds, rubies and Amethyst has been investigated. Third harmonic of Nd: YAG laser at the wavelength of 532 nm and 405 nm blue diode is used to excite the stones. Our results indicate that the f…
In this research, we investigate the effect of near field of gold colloidal nanoparticles on the enhancement of quantum yield of DCM dye. The gold nanoparticles due to possessing the absorption peak in the visible region can have most interaction with the dye molecules which are active in the visible region. The quant…
In this paper pure and Fe doped lead zirconate titanate nanoparticles (PZT-NPs) were synthesized using sol-gel method. The xerogel was calcinated at temperature of 700 °C. The structure of the prepared powders is characterized using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The XRD re…
In this study, nano-porous silica (SiO2) anti-reflection thinfilm fabricated on glass substrate via layer by layer deposition process. Optical properties and surface morphology was investigated by using UV / vis spectrophotometer and FE-SEM. The results showed that nanostructured porous silica with an average pore siz…
We have used a transfer matrix method (TMM) to introduce high performance reflection-type one dimensional magnetophotonic crystals (MPCs). In following, for practical purposes, the influence of the error in the thickness of individual layers on the operational parameters of the high-performance MPCs have also been con…
In this paper the scattering of surface waves in the presence of a single defect in the metal-vacuum interface is investigated. By modifying the previous methods we could explore more general forms of defect and get transmission, reflection and scattering coefficients of surface plasmon using both Rayleigh expansions…
In this article a polarization filter has been proposed by using photonic crystal (PhC) on InP substrate. The photonic crystal is consisted of holes embedded in InP/InGaAsP materials with an effective refractive index of 3.2634 which is arranged in the hexagonal lattice of holes structure (20×20). The optimize lattice…
Monodisperse suspensions of rodlike chiral $fd$ viruses are condensed into a rod-length thick colloidal monolayers of aligned rods by depletion forces. Twist deformations of the molecules are expelled to the monolayer edge as in a chiral smectic $A$ liquid crystal, and a cholesteric band forms at the edge. Coalescence…
Abstract-Characteristics of photodetectors consisting armchair graphene nanoribbons (a-GNR) channels and asymmetric source and drain contacts, under monochromatic illuminations of various incident energies in the range of mid infrared to solar blind ultra violet, are simulated. Simulations show, for light of incident…
In this paper, using surface plasmon resonance effect, we demonstrate an optical OR gate. We have used gold and silver because of low losses of silver and gold in visible regime compared to other metals. The photonic crystal structure consists of a hexagonal lattice of iron nano rods, with a radius of r=50 nm and latt…
In this paper optical properties such as dielectric function, absorption coefficient، energy loss function and reflectivity coefficient of SiO2 crystal have been studied. The calculation have been performed using the Full-PotentialLinearrised Argumented Plane Waves (FP-LAPW) method within the framework density functio…
Wet chemical etching is one of the extensively process in the fabrication of optoelectronic devices such as semiconductor lasers. In this paper the GaAs wafer etched in phosphoric acid/ hydrogen peroxide/ methanol solution at 0-4°C by dipping. The results of this experiment were studied by Dek Tak surface profile mete…
According to Interesting optical properties and many uses of Titanium Nitride (TiN) in the industry in this paper, the optical properties of TiN have been investigated. These investigations are done by using the linearized augmented plane wave method (LAPW) within density functional theory (DFT) with WIEN2k package.To…