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The Φ6-model expansion method for solving the Radhakrishnan-Kundu-Lakshmanan equation with Kerr law nonlinearity Optik (IF 2.187) Pub Date : 2021-02-26 Khalida Bibi
In this paper, the Φ6-model expansion method is applied to obtain the new exact solutions of the perturbed Radhakrishnan-Kundu-Lakshmanan equation that appears with Kerr law nonlinearity. The obtained exact solutions are based on the Jacobi elliptic function, hyperbolic function and trigonometric function solutions. Specific values of the parameters consistent with the constraint conditions are also
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A phosphor converted RED light for automotive LED rear lamp and compliance with ECE light regulation Optik (IF 2.187) Pub Date : 2021-02-25 Seok-Ho Jeong; Jung-Young Kim; Xiao Xiao; Young-Suk Kim
In conventional red color lighting LED lamp for vehicles are composed of red color lighting LED and additional transparent or red lenses. Generally red color lighting LED is based on the semiconductor materials as AlGaInP, AlGaAs or GaAsP. Such RED LEDs are mostly affected by temperature. As the temperature increases, the luminous flux droops sharply and lighting efficiency decreases accordingly. In
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High-efficiency terahertz wave generation combined with optimized cascaded difference frequency generation and optical parametric oscillator Optik (IF 2.187) Pub Date : 2021-02-25 Zhongyang Li; Binzhe Jiao; Wenkai Liu; Qingfeng Hu; Yongjun Li; Xiangqian Sun; Jia Zhao; Pibin Bing; Hongtao Zhang; Kai Zhong; Jianquan Yao
We propose a high-efficiency scheme to generate THz waves combined with optimized cascaded difference frequency generation (OCDFG) and optical parametric oscillator (OPO) consisting of a periodic poled lithium niobate (PPLN) crystal or an aperiodic poled lithium niobate (APPLN) crystal at 100 K. The phase mismatches of the OCDFG are decreased in cascaded Stokes processes and increased in cascaded anti-Stokes
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Quantum computational, linear and non-linear optical properties of spin-coated nickel (II)-tetraphenylporphyrin/FTO thin films Optik (IF 2.187) Pub Date : 2021-02-24 Amr Attia Abuelwafa; H.M. Alsoghier; Sahar Elnobi; M. Dongol; T. Soga
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Quick X-ray pulsar positioning and velocimetry approach based on quantum CS Optik (IF 2.187) Pub Date : 2021-03-03 Da-liang Wu; Jin Wu; Jin Liu; Xin Ma; Zhi-wei Kang
CS (compressive sensing) is adept in the signals of X-ray pulsars. The observation matrix in CS is a core technology. In the CS for X-ray pulsars, the observation matrix has three significant indexes: simple computation, arbitrary size and high precision. To optimize the observation matrix, we propose a quick quantum-based CS, and apply it to the pulsar positioning and velocimetry approach. In the
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Optical solitons of the resonant nonlinear Schrödinger equation with arbitrary index Optik (IF 2.187) Pub Date : 2021-03-03 Nikolay A. Kudryashov
Traveling wave reduction of the resonant nonlinear Schrödinger equation with arbitrary refractive index is considered. The system of equations for real and imaginary parts is presented. The first integrals for the system of equations are found. This system of equations is transformed to the only governing nonlinear ordinary differential equations of the first order. Exact solutions in the form of periodic
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Ternary CuO:SnO2:ZnO (1:1:1) composite thin film for room temperature gas sensor application Optik (IF 2.187) Pub Date : 2021-02-26 S.R. Cynthia; R. Sivakumar; C. Sanjeeviraja
The present work reports the good sensing characteristics of ternary CuO:SnO2:ZnO (1:1:1) thin films prepared by radio frequency magnetron sputtering technique towards the detection of NH3 gas. The crystalline nature of the films was observed after annealing the films at 1000 °C. A remarkable variation was observed in the surface morphology (tiny spherical particle, hexagon and cauliflower shaped structure)
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Impact of selenium composition variation in CZTS solar cell Optik (IF 2.187) Pub Date : 2021-02-25 Atul Kumar
A comparative performance analysis of selenium composition variation in Cu2ZnSn(SXSe1-X)4 is analytically performed in this paper. We obtained the optimal stoichiometry (Cu2ZnSnS1.8Se2.2) where efficiency is highest. Comparative simulation brings out the trend of device characteristics variation with stoichiometry. The comparative simulation for band diagram shows the band banding at rear in CZTS whereas
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Back-scattered cross section from a sparse distribution of tilted thin dielectric disks Optik (IF 2.187) Pub Date : 2021-02-24 Hassan ullah; Z.A. Awan; Arshad Hussain
The back-scattered cross section from a sparse distribution of tilted thin circular dielectric disks have been investigated using numerical simulations. Three widely known scattering approximations from a dielectric disk such as Rayleigh–Gans, Koh–Sarabandi and volumetric integral physical optics have been used for the proposed theory. The influences of the various parameters including incident angle
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Cubic–quartic optical soliton perturbation in polarization-preserving fibers with Fokas–Lenells equation Optik (IF 2.187) Pub Date : 2021-02-18 Elsayed M.E. Zayed; Mohamed E.M. Alngar; Anjan Biswas; Yakup Yıldırım; Salam Khan; Abdullah K. Alzahrani; Milivoj R. Belic
This research article yields solitons for Fokas–Lennel’s equation. A couple of integration approaches recover bright and singular soliton solutions together with their existence criteria.
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Photonic bandgap characteristics of GaAs/AlAs-based one-dimensional quasi-periodic photonic crystal Optik (IF 2.187) Pub Date : 2021-02-24 Amita Biswal; R. Kumar; Chittaranjan Nayak; Samiappan Dhanalakshmi
The optical behavior of GaAs/AlAs based 1D multi-layered quasi-periodic photonic crystal is investigated by employing the transfer matrix method (TMM). The complex dielectric constants are employed for analyzing the transmission spectra of the crystal at the long-wave limit. The numerical results are studied for different quasi-periodic sequential arrangements of GaAs/AlAs, which is also compared with
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Studies on photonic bandgap and its defect mode characteristics of plasma photonic crystals based on S-MRTD scheme Optik (IF 2.187) Pub Date : 2021-02-20 Zhu Ma; Min Wei; Tianhong Pan
Photonic bandgap (PBG) and its defect mode are two representative characteristics of plasma photonic crystals (PPC), which make them have important industrial applications in photonic crystal waveguides, filters, antennas, and other devices. In this paper, we apply the symplectic multi-resolution time-domain (S-MRTD) scheme to analyze these two properties. Firstly, the characteristics of PBG are analyzed
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Scattering from an inhomogeneous dielectric cylinder partially buried in a dielectric half-space Optik (IF 2.187) Pub Date : 2021-02-25 Cengiz Ozzaim
A hybrid method is presented for computing the TM polarized plane wave scattered by an inhomogeneous penetrable cylinder embedded in the planar interface between two dielectric half-spaces. In this method, the infinite interface is represented by an unknown equivalent magnetic current, which is expressed in terms of the difference between the current with the cylinder present and the current of the
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Synthesis and photoluminescence properties of a potential red-emitting phosphor Sr2-xNb2O7: xEu3+ for white LEDs Optik (IF 2.187) Pub Date : 2021-03-02 Qifeng Tang; Tao Yang; Biao Guo; Jinqing Ao; Biyou Peng
A series of phosphors Eu3+-activated Sr2Nb2O7 red emitting phosphors were synthesized using a solid-state method in high temperature air. The X-ray diffraction (XRD) pattern showed that the single phase was obtained and the particles illustrated a narrow size distribution of about 0.75 μm. The excitation and emission spectrum show that the phosphor can be excited under the light of 393 nm or 465 nm
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A SYSTEM AND A METHOD TO MEASURE THE JUNCTION TEMPERATURE OF LEDs Optik (IF 2.187) Pub Date : 2021-03-02 E. Ozuturk
In this study, a new method of measuring LED junction temperature is given. The linear relative radiant power/temperature variation has been utilized in this method. This method can be applied at pulsed high currents of LED. The measurement system used here consists of a pulse oscillator, an appropriate LED driving circuit and a photodetector circuit. A photodetector voltage, which is proportional
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Elaboration and studies of physical and photo-electrochemical properties of La2NiO4 and its use with SnO2 in photo-evolution of hydrogen under visible light irradiation Optik (IF 2.187) Pub Date : 2021-03-02 R. Laouici; S. Douafer; H. Lahmar; G. Rekhila; M. Trari; M. Benamira
La2NiO4 elaborated by nitrate route gives a positive result when used as a catalyst for the hydrogen photo-evolution. The prepared oxide crystallizes in the tetragonal K2NiF4 structure I4/mmm. The BET method was used to determine the specific surface area (4.91 m2/g); such value could suggest an interesting catalytic activity. Optical, electrical and photo-electrochemical properties have been studied
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A kind of improved quantum key distribution scheme Optik (IF 2.187) Pub Date : 2021-03-02 B. Wang; B.F. Zhang; F.C. Zou; Y. Xia
In this paper, the problem on quantum key distribution (QKD) is discussed. Firstly, based on the framework of BB84 protocol and Heisenberg's uncertainty principle, a kind of QKD scheme is proposed; then, theoretical analysis is conducted to justify the QKD scheme; finally, some examples have been included, and the results show that the given QKD scheme not only inherits the simple and practical property
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Highly Sensitive Dual-Core Symmetrical Side-Polished Modified D-shaped SPR Based PCF Refractive Index Sensor with Deeply Etched Micro Openings Optik (IF 2.187) Pub Date : 2021-03-02 Shivam Singh; Y.K. Prajapati
A novel dual side-polished photonic crystal fiber (DSP-PCF) refractive index (RI) sensor is proposed for the RI detection range of 1.30-1.35. An active plasmonic metal gold (Au) is deposited on a polished flat fiber surface to generate plasmons so that it can detect the change in RIs of its surrounding medium. A thin titanium dioxide (TiO2) layer is coated to assist the adhesion of Au layer with silica-based
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Study and Optimization of Die-Bonding Technology for Semiconductor Lasers based on Differential-analysis Optik (IF 2.187) Pub Date : 2021-03-02 Peidong Xu; Bin Wang; Yong Wang; Xiantao Wang
This study proposed the method of “differential analysis” based on the study and analysis of the die-bonding technology in semiconductor laser packaging by using the analysis of ray tracing and thermal characteristics to explore the influence of the differential (Δx,the position error between the laser chip and the Submount) on the optical efficiency and heat dissipation performance of the device.
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Effect of bending on photonic crystal fiber based surface plasmon resonance biosensor Optik (IF 2.187) Pub Date : 2021-03-02 Ahmet Yasli; Huseyin Ademgil
In this study, the effect of bending on proposed PCF based SPR biosensor has been analysed by employing the Full vectorial Finite Element Method (FVFEM) with Perfectly Matched Layers (PMLs). The spectral interrogation method is chosen to calculate the sensitivity and the resolution of the proposed sensor structure. The blood components (water, cytop, blood plasma, white blood cell (WBC)) refractive
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Correction of the error induced by obscurations of Ritchey-Chretien collimators for high-resolution space camera MTF measured with the ISO 12233 slanted-edge method Optik (IF 2.187) Pub Date : 2021-03-02 Shangkuo Liu; Kai Liu; Kewei E; Tao Wang; Zhaohui Li; Baoli Yao
We propose a method to correct the error induced by the obscurations of Ritchey-Chretien (R-C) collimators, when measuring modulation transfer function (MTF) of high-resolution space cameras by the ISO 12233 slanted-edge method. The obscurations of an R-C collimator include the secondary mirror (SM) and its supporting bars. Mathematical models are derived to simulate possible obscurations by virtual
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Influence of Ni-Co dual doping on structural and optical properties of CdSe thin films prepared by chemical bath deposition method Optik (IF 2.187) Pub Date : 2021-03-02 A.M. Abdulwahab; Asma'a Ahmed AL-Adhreai; Abdullah Ahmed Ali Ahmed
Pure and Ni-Co dual doped CdSe thin films were deposited on glass substrate by chemical bath deposition (CBD) technique. The deposited thin films were annealed for 1 hour at 500 °C. X-ray diffraction (XRD) and UV-VIS Spectroscopy were used to study the structural and optical properties of the prepared thin films. XRD studies revealed the hexagonal phase for pure CdSe, CdSe: 0%Ni-8%Co, CdSe: 2%Ni-6%Co
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Twisted-motion substrate with sustained azimuthal rotation effect on the growth of AZO thin films by rf-sputtering Optik (IF 2.187) Pub Date : 2021-02-17 L.G. Daza; I.V. Perez-Quintana; B. Cruz-Muñoz; M. Herrera-Salvador; R. Castro-Rodríguez
Nanorods of aluminum doped zinc oxide films (AZO) were grown on borosilicate glass substrates using an rf-sputtering technique combining simultaneously substrate twisting motion frequency with sustained rotation. Twist-motion frequency of 0.35, 0.5, and, 0.75 Hz between 40° to -40° taking the horizontal plane as reference was adjusted. Effects of this twist-motion frequency as a function of the sustained
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Investigation of volume fraction of GaP nanowires by SEM characterization and spectroscopic ellipsometry Optik (IF 2.187) Pub Date : 2021-02-22 J. Škriniarová; P. Hronec; J. Chlpík; A. Laurenčíková; J. Kováč; J. Novák; R. Andok
In this paper we focus on investigation of GaP volume fraction in GaP nanowires (NWs) prepared on GaP substrates by MOVPE using VLS mode. For this purpose, spectroscopic ellipsometry (SE) and scanning electron microscopy (SEM) image processing methods were used showing a good agreement. In ellipsometry, composition of GaP and void was modeled using linear gradient model in combination with Bruggeman
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Correlation between mechanical and optical properties of ZnO nanowire Optik (IF 2.187) Pub Date : 2021-02-16 Ali Vazinishayan; Mohammad Reza Hairi Yazdi
Understanding mechanical and optical responses is significantly important for the development and application of nanowire devices. Hence, special structures are required to provide a level of performance that is adequate for the given application. With this breakthrough, in this work, a model is proposed by combining finite element modeling (FEM) software package ABAQUS and three-dimensional (3D) finite-difference
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Sustainable preparation of Ixora flower-like shaped luminescent powder by recycling crab shell biowaste Optik (IF 2.187) Pub Date : 2021-03-01 M.V.S. Rezende; U.C. Pereira; Y.R.R.S. Rezende; I.S. Carvalho; W.S. Silveira; D.O. Junot; R.S. Silva; C.X. Resende; N.S. Ferreira
We report on cost-effective recycling of crab shell biowaste and synthesis of luminescent powders. XRD, thermogravimetric and, FTIR analysis revealed that calcination temperature must be beyond ∼800 °C to recycle biowastes crab (Ucides cordatus) shell into crystalline powder composed of CaO, and a small amount of CaCO3, NaCa(PO4), MgO, and Ca₁₀(PO₄)₆(OH)₂. SEM analysis revealed that calcination of
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High-gravity-driven process intensified approach toward Mn2+ doped Zn2GeO4 nanophosphors for deep-ultraviolet detecting Optik (IF 2.187) Pub Date : 2021-03-01 Simin Cui; Yiran Jiao; Jiangyong Liu; Yuan Pu; Jie-Xin Wang; Dan Wang
Deep-ultraviolet (DUV) light devices are receiving widely attention due to their potential use in sterilization and water purification, in particularly, during the COVID-19 pandemic. Photoluminescence detectors that demonstrate the existence of DUV light invisible to our eyes are of importance. Herein, we proposed a process intensified approach via high-gravity reactive precipitation combined with
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Steady states and stability of the circulating light in the air atmosphere Optik (IF 2.187) Pub Date : 2021-03-01 V.P. Torchigin
We show that the necessary conditions are met for the existence of stable circulating light in the ordinary atmosphere of the earth. Circulating light is a thin spherical layer of highly compressed air in which intense white light circulates in all possible directions. The reflective index of highly compressed air is increased compared to that of the surrounding area. In this case, a thin layer of
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Synthesis, characterization and optical properties of Co2+ doped PbS nanocrystals Optik (IF 2.187) Pub Date : 2021-03-01 M.A. Mora-Ramírez; M. Chávez Portillo; A. Reyes Díaz; O. Portillo Moreno
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Fabrication of mesoporous WO3-SBA-15 catalysts and enhanced photocatalytic degradation of harmful dyes Optik (IF 2.187) Pub Date : 2021-03-01 Sakthivel Kumaravel; Sivakumar Thiripuranthagan; Thanigaivel Vembuli; Elangovan Erusappan; Mathivanan Durai; Thamaraiselvi Sureshkumar; Mani Durai
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Synthesis and photoluminescent properties of Ca5(PO4)3(OH): Eu3+,Li+ nanophosphor with different morphologies Optik (IF 2.187) Pub Date : 2021-03-01 Fusheng Zhu; Hongyan Zhang; Xiaoqin Feng; Yuanxiang Fu; Hongsheng Huang
Sheet-like and rod-like nano Ca5(PO4)3(OH):0.05 Eu3+, xLi+(x = 0.01-0.07) phosphors were prepared by hydrothermal method. The structure, morphology and luminescent properties of samples were characterized by XRD, EDS, SEM, TEM and PL. The effects of morphology and Li+ doping on the luminescent properties of Ca5(PO4)3(OH):Eu3+ were studied. The results show that Li+ doping has little effect on the luminescent
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Controllable transmission of Airy-Gaussian beams in fractional Schrödinger equation under Gaussian potential Optik (IF 2.187) Pub Date : 2021-03-01 Yan Xiao; Jing Zhang; Pengxiang Wang
Based on fractional Schrödinger equation (FSE), we have emphatically investigated the evolution of Airy-Gaussian (AiG) beams under Gaussian potential by split-step Fourier method. Only when beam is incident vertically can splitting occur. When taking Gaussian potentials into account, periodic evolution can be achieved by assigning appropriate values to barrier parameters, avoiding the transmission
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UV and VUV induced luminescence in Tb3+ doped Ca3La3(BO3)5 phosphors for PDP applications Optik (IF 2.187) Pub Date : 2021-03-01 R. Kokate; Govind B. Nair; S.J. Dhoble; Hoonil Jeong; Hakyung Jeong; Rajamouli Boddula; Vijay Singh
Ca3La3-x(BO3)5:xTb (x = 0.005 to 0.10) phosphors were synthesized by the sol-gel process. The formation of the sol-gel products was confirmed by X-ray diffraction (XRD) analysis. The samples were also characterized by FTIR spectroscopy to study the nature of bonding between boron and oxygen ions. The luminescence properties of the synthesized products were examined under ultraviolet (UV) and vacuum
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Simulation and measurement of the effect of various factors on underwater polarization patterns Optik (IF 2.187) Pub Date : 2021-03-01 Haoyuan Cheng; Jinkui Chu; Ran Zhang; Peiqi Zhang
To realize the underwater polarization navigation, the study of underwater polarization patterns is necessary. The current method is mainly numerical simulation because of detection equipment and experimental environment limitations. In the paper, we establish the model to simulate the underwater polarization patterns under different conditions and design the experiment to study the effect of various
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Development of near infrared luminescent Pb1-xYbxS QDs using tert-dodecylmercaptan assisted microwave technique for quantum optics and optical laser amplifiers Optik (IF 2.187) Pub Date : 2021-03-01 H. Khanbashy
Highly near infrared luminescent Pb1-xYbxS QDs were prepared using tert-dodecylmercaptan assisted microwave technique. The Pb1-xYbxS QDs showed sizes range from 3.4 to 9.8 nm with narrow distribution. The quantum dot size to excitonic Bohr radius ratio for the Pb1-xYbxS QDs was found in the range 0.05 to 0.09, implying the strong degree of confinement. The optical absorption spectra disclosed the decrease
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Weibel instability of a relativistic electron beam in a plasma channel Optik (IF 2.187) Pub Date : 2021-03-01 Ram Jeet; Sanjay Babu; Asheel Kumar
A nonlocal theory of Weibel instability of a relativistic electron beam, propagating through a plasma channel, is developed in the slab geometry. For beam density greater than the plasma density (n0b≥n0), the beam of finite spot size pushes the plasma electrons out of the beam region and imparts return velocity to plasma electrons in the outer region. The relative drift between the inner region beam
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Investigation on ZnTiO3 codoped Er3+/ Yb3+ nanophosphors with enhanced upconversion emission and in temperature sensing application Optik (IF 2.187) Pub Date : 2021-02-17 Joydip Dutta; Mitesh Chakraborty; Vineet Kumar Rai
Zinc titanate (ZnTiO3) phosphors containing Er3+/Yb3+ as active ions have been synthesized by using the solid state reaction method. The structural, surface morphology and optical properties of the Er3+/Yb3+ ZnTiO3 phosphors have been studied by X-ray diffraction (XRD), FE-SEM, EDX, Fourier Transform Infrared (FTIR), Raman analysis. The quantum computational program has been employed to investigate
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The influence of phase difference on the effect of multi-beam interference processing Optik (IF 2.187) Pub Date : 2021-02-22 Chi Wang; Yongliang Li; Yashuai Yang; Zhiwen Chen; Yingming Zhang
The influence of phase difference in laser interference lithography system is often ignored by researchers. In this paper, we simulated the interference process of dual-beam, three-beam and four-beam, and the influence of phase difference on the interference effect was discussed in detail. The simulation results show that in the process of dual-beam and three-beam interference, the change of phase
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Propagation of hyperbolic sinusoidal Gaussian beams in uniaxial crystals orthogonal to the optical axis Optik (IF 2.187) Pub Date : 2021-02-23 Mert Bayraktar
In this paper, hyperbolic sinusoidal Gaussian(HSG) beam propagates in uniaxial crystal orthogonal to the propagation axis. Received field expression is evaluated analytically based upon Huygens-Fresnel integration. Numerical results are plotted in order to analyze the effect of variations in source beam parameters, crystal refractive index features, and propagation distance. We investigate that beam
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Bilayer number driven changes in polarizability and optical property in ZnO/TiO2 nanocomposite films prepared by ALD Optik (IF 2.187) Pub Date : 2021-02-22 S.S. Fouad; B. Parditka; M. Nabil; E. Baradács; S. Negm; H.E. Atyia; Z. Erdélyi
Samples of ZnO/TiO2 bilayer films with various layer thickness were fabricated by atomic layer deposition (ALD). The X-ray diffraction (XRD) patterns revealed the absence of sharp peaks and confirms the amorphous nature of the samples under study. The absorption spectra of ZnO/TiO2 for the three samples were obtained in view of incident wavelength range (350–700 nm). The absorption spectra were used
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A novel Tb3+ ions doped barium strontium fluorosilicate (Tb3+: BSFS) glasses for green laser emission and white LEDs Optik (IF 2.187) Pub Date : 2021-02-22 K. Mariselvam; Juncheng Liu
A novel Tb3+ ions doped barium strontium fluorosilicate (Tb3+: BSFS) glasses were synthesized with melt-quenching, of which chemical composition was (55-x) SiO2 + 10 BaCO3 + 10 SrCO3 + 15 CaF2 + 10 ZnO + x Tb4O7, x = 0.1, 0.5, 1.0 & 2.0 wt. %. And its structural, physical and optical properties were investigated. X-ray diffraction analysis confirmed that this Tb3+: BSFS was amorphous, a glass in nature
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Atmospheric coherence time measurement by modified Fast Defocus method Optik (IF 2.187) Pub Date : 2021-02-16 Lida Akbari; Ahmad Darudi; Ramin Shomali
The present paper introduces a method for measuring the atmospheric coherent time which is based on Fast Defocus method (FADE). The configuration of the system is modified in which, instead of an annular aperture, a mask with 8 or 4 regular apertures is used. In FADE there is an optics behind the telescope to make an annular image of the star at focus but in the current method, the image of the star
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Dynamics of a moving quantum charged particle Optik (IF 2.187) Pub Date : 2021-02-19 A.I. Arbab
Quantum equations describing a moving charged quantum particle are derived. The electric nature is described by the current and charge densities, J→ and ρ; and the quantum nature by the particle mass, wavefunctions, ψ→ and ψ0. The vector wavefunction, ψ→ is found to act along the current direction. The energy of the matter fields concomitant with a particle is found to flow along the current direction
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Cubic–quartic optical soliton perturbation with Lakshmanan–Porsezian–Daniel model Optik (IF 2.187) Pub Date : 2021-02-22 Elsayed M.E. Zayed; Mohamed E.M. Alngar; Anjan Biswas; Yakup Yıldırım; Padmaja Guggilla; Salam Khan; Abdullah K. Alzahrani; Milivoj R. Belic
This paper studies cubic–quartic Lakshmanan–Porsezian–Daniel model with three integration algorithms. A spectrum of single as well as straddled soliton solutions emerge along with their existence criteria that naturally fall out from the schemes. These pave way to further future investigations to the governing model along with its extensions and generalizations.
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Synthesis red-emitting Ca2LaNbO6:xSm3+ phosphors for good color-rendering-index white-LED devices Optik (IF 2.187) Pub Date : 2021-02-22 Zunhua Li; Yongbiao Hua; Guangchuan Ou
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Semi-analytical investigation on plasma density and reduced electric field of glow discharge in a turnery gas cw-CO2 laser Optik (IF 2.187) Pub Date : 2021-02-26 Nader Morshedian; Mojtaba Kabir; Majid Aram; Ahmad Mehramiz
The plasma density and the reduced-electric-field (REF) parameters of CO2 gas laser have been measured and calculated at the maximum and minimum discharge current in terms of the similarity variable in order to investigate the discharge regimes. These parameters have been obtained with various combinations of ratios of CO2: N2: He gases. The obtained results were based on a new definition of the reduced
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Designing anti-trapezoidal electron blocking layer for the amelioration of AlGaN-based deep ultraviolet light-emitting diodes internal quantum efficiency Optik (IF 2.187) Pub Date : 2021-02-17 Muhammad Usman; Tariq Jamil; Shahzeb Malik; Habibullah Jamal
We have proposed and investigated a DUV LED device with anti-trapezoidal quaternary electron blocking layer (EBL) numerically. The simulation results show that the anti-trapezoidal quaternary EBL is a better approach for diminishing the electron overflow and boosting the hole into the active region. This improves radiative recombination, which is responsible for the significant enhancement in IQE and
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Highly Q-factor optical metasurface based on DNA nanorods with Fano response for on-chip optical sensing Optik (IF 2.187) Pub Date : 2021-02-19 Sepideh Ebrahimi; Shima Poorgholam-Khanjari
In this paper, a MIM metasurface is suggested for optical sensing based on nanorods of DNA which are placed over the metal layer. The nanorods can increase the absorption of the energy and thus the reflection value reduces extremely in comparison to the uncoated surface. Here, the nanorods of DNA are used to amend the reflection from -23 to -37 dB and so the Q-factor is increased from 90 to 784 at
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Optical and vibrational properties of Ni doped ZnSe nanospheres Optik (IF 2.187) Pub Date : 2021-02-19 S.M. Saini; K.S. Ojha
Ni doped ZnSe nanospheres in presence of PVA have been synthesized via a cost effective and simple solvothermal method. The structural and rnorphological characterization of as undoped and doped samples have been made using X-ray diffraction (XRD) and FESEM imaging techniques and it reveals the formation of Ni doped ZnSe nanospheres with crystallite size 6 nm. The observed red shift in absorption edge
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Application of adaptive Neuro-fuzzy interference system, fuzzy interference system and least squares support vector machine for rapid simultaneous spectrophotometric determination of antipsychotic drugs in binary mixtures and biological fluid Optik (IF 2.187) Pub Date : 2021-02-19 Mojdeh Alibakhshi; Mahmoud Reza Sohrabi; Mehran Davallo
In this study, the application of chemometrics-assisted UV spectrophotometry was presented for the simultaneous determination of Risperidone (RIS) and Haloperidol (HP) in binary mixtures and biological fluid. The basis of the spectrophotometric procedure were the least squares support vector machine (LS-SVM), fuzzy inference system (FIS), and adaptive Neuro-fuzzy inference system (ANFIS) methods. A
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Modeling and experimental analysis on the effect of carrier aircraft vibration on the imaging quality of an aspherical aerial camera Optik (IF 2.187) Pub Date : 2021-02-19 Jieqiong Lin; Jiahang Tian; Mingming Lu; Tonghuan Ran; Jiakang Zhou
As one of the important factors, the vibration of the carrier aircraft has its impact on the imaging quality of an aspherical aerial camera. To analyze the imaging quality of the aspherical aerial camera under the vibration of the carrier aircraft, a mathematical model is established in this paper based on the theory of the transfer function and the carrier aircraft vibration principle to describe
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Quantitative comprehension the impact of X-light on current gain of lateral PNP bipolar transistor Optik (IF 2.187) Pub Date : 2021-02-19 Xi Congling; Gao Huimin; Changshi Liu
Bias emission voltage and dose-dependent current gain are the key parameters to detect the physical performance of bipolar transistors. Firstly, the effect of X-light with energy 22.1 and 25.0 keV from 109Cd on the current gain of lateral PNP bipolar transistors is measured. The substantial difference of current gain with the variation of bias and emission voltage is observed. Then, on basis of the
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The luminescence characteristics of Pb1-xEuxSe photonic QDs prepared via polymethoxy-ethylhexyloxy-phenylenevinylene assisted polyol technique for laser applications Optik (IF 2.187) Pub Date : 2021-02-18 Asmahan Al-Sheikhi
The photonic crystals based semiconductor quantum dots have revealed auspicious characteristics for the optoelectronic devices. The most difficult way to achieve lasing lies in the creation of sufficient nonradiated Auger recombination’s process. Therefore, there is a real demand to enhance the lasing efficiency, either by increasing the concentration of quantum dots or through the improving of the
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Significant enhancement of ZnO nanowires/ZnO/Mg0.2Zn0.8O ultraviolet photodetectors via light trapping effect Optik (IF 2.187) Pub Date : 2021-02-18 Nan Wang; Dayong Jiang; Man Zhao
In order to optimize the performance of the ultraviolet photodetectors, a dual-band detector with light trapping effect is fabricated by using a hydrothermal method. By adding Mg into ZnO material can form Mg0.2Zn0.8O alloy which results the band gap increases and the detection region extends to the shorter wavelength. With the introduction of nanowires, the responsivity increases which is attributed
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Generation of anomalous vector Bessel beams with varying polarization order along the propagation direction Optik (IF 2.187) Pub Date : 2021-02-19 Bo Yang; Mingyang Su; Liming Lu; Junmin Liu; Guangyue Chai
Vector Bessel beams (VBBs) contain non-uniform polarization distributions on the cross-section and non-diffraction characteristics, have been widely used in many fields, including optical trapping, optical microscope, optical communication, etc. Here, we propose a theoretical model to obtain anomalous-VBBs with polarization order dependent on propagation distance. Based on geometrical optics principle
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Determination of a grown oxide layer thickness and optical constants of Zn and Cd metals Optik (IF 2.187) Pub Date : 2021-02-18 Mohamed Shehata; Alshaimaa W. Abdallah; Sobhy S. Ibrahim; Mohamed H. Osman; Nabil N. Nagib
Optical constants of Zn and Cd polycrystalline metals are measured using both quasi polarizing angle and principal angle of incidence methods at wavelength 633 nm. The quasi polarizing angle is the angle at which the intensity of the p-polarized reflection component reaches its minimum value. It depends only on the rotation of the sample using a rotating stage (with accuracy ± 0.1º) without moving
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Investigation of plasma cladded optical fiber for dynamic manipulations of its propagation properties Optik (IF 2.187) Pub Date : 2021-02-15 A.K. Mishra; Sarang Medhekar; J. Parashar; Mukesh Kumar
Plasma cladded optical fiber (PCOF) is numerically investigated which exhibits tunable guiding properties. The effect of plasma frequency on mode field diameter, longitudinal propagation constant and modal dispersion are investigated thoroughly. It is shown that propagation features of PCOFs could be manipulated dynamically (online) by varying the plasma frequency; suggesting its potential applications
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Z-domain mathematical modeling and performance analysis of ripple ring resonator (RRR) with design of all-optical arithmetic logic unit (ALU) Optik (IF 2.187) Pub Date : 2021-02-15 Kuldeep Singh; Sanjoy Mandal
A novel ripple ring resonator (RRR) structure is proposed and analyzed by coupling two and three optical microring resonators (OMRRs). All-optical arithmetic logic unit (ALU) with seven operations is presented using the proposed RRR structure. The mathematical pedestal is derived in Z-domain using delay line signal processing. The simulation presented using MATLAB. The RRR performance is analyzed in
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Tunable anisotropic absorption based on black phosphorous multilayer structures Optik (IF 2.187) Pub Date : 2021-02-22 Hongxu Li; Xin Zhang; Xisheng Xiao; Yanli Xu
Black phosphorus (BP) exhibits strong anisotropy due to its specific lattice structure. In this work, we propose an absorption structure in the terahertz band, in which a two-dimensional (2D) BP metamaterial is sandwiched between dielectric layers. The proposed structure demonstrates tunable anisotropic absorption using coupling mode theory. The absorption reaches 99.4% at the resonance frequency of
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Output performance analysis and power optimization of different configurations half-cell modules under partial shading Optik (IF 2.187) Pub Date : 2021-02-18 Zewei Yang; Kailin Liao; Jun Chen; Lei Xia; Xuetao Luo
The performance of photovoltaic (PV) modules is influenced by environmental variables, especially shading. Partial shading makes the solar irradiance level of solar cells in PV modules uneven, thus reducing the performance of PV modules and even damaging the PV modules. In this work, the single diode model and the Bishop model are used to simulate the I–V characteristics of various half-cell modules
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