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Nano Research 2021年第1期14卷 260-267页

作者： Bingzhi Liu Huihui Wang Wei Gu Le Zhou Zhaolong Chen Yufeng Nie Congwei Tan Haina Ci Nan Wei Lingzhi Cui Xuan Gao Jingyu Sun Yanfeng Zhang Zhongfan Liu Center for Nanochemistry College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China College of Engineering Peking UniversityBeijing 100871China College of Energy Soochow Institute for Energy and Materials InnovationsJiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China

Growing high quality graphene films directly on glass by chemical vapor deposition(CVD)meets a growing demand for constructing high-performance electronic and optoelectronic devices.However,the graphene synthesized by prevailing methodologies is normally of polycrystalline nature with high nucleation density and limited domain size,which significantly handicaps its overall properties and device performances.Herein,we report an oxygen-assisted CVD strategy to allow the direct synthesis of 6-inch-scale graphene glass harvesting markedly increased graphene domain size(from 0.2 to 1.8μm).Significantly,as-produced graphene glass attains record high electrical conductivity(realizing a sheet resistance of 900Ω·sq^(-1)at a visible-light transmittance of 92%)amongst the state-of-the-art counterparts,readily serving as transparent electrodes for fabricating high-performance optical filter devices.This work might open a new avenue for the scalable production and application of emerging graphene glass materials with high quality and low cost.

关键词： 0_(2)-assisted chemical vapor deposition(CVD) graphene growth large domain glass optical filter

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

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Chinese Physics B 2022年第1期31卷 603-607页

作者：刘艺杨保东王军民黄文艺缑芝玉周海涛 College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China State Key Laboratory of Quantum Optics and Quantum Optics Devices and Institute of Opto-Electronics Shanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

A narrow linewidth Faraday anomalous dispersion optical filter(FADOF)with reflection configuration is achieved for the first time based on the cesium(Cs)ground state 6S_(1/2) to the excited state 6P_(3/2) transition at 852 nm.Compared with the conventional FADOF with transmission configuration,reflection-type FADOF can greatly improve the transmittance of optical filter under the same experimental parameters,because it allows signal light to go and return through the atomic vapor cell.In our experiment,peak transmittance at Cs 6S_(1/2) F=4-6P_(3/2) transition is 81%for the reflection-type FADOF,and while 54%for the transmission-type FADOF when the temperature of Cs vapor cell and the axial magnetic field are 60℃and 19 G.The idea of this reflection-type FADOF design has the potential to be applied to the FADOF operating between two excited states to obtain higher transmittance.

关键词： Faraday effect optical filter remote sensing

Design of optical filter Using Bald Eagle Search Optimization Algorithm

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Intelligent Automation & Soft Computing 2023年第4期36卷 1215-1226页

作者： L.Jegan Antony Marcilin N.M.Nandhitha Research Scholar Department of ECESathyabama Institute of Science and TechnologyChennai600119India

Controlled thermonuclear reactors require consistent monitoring of plasma in the toroidal chamber.Better working conditions of such machines can be monitored by analyzing its radiations.Various wavelengths such as 656.3,486.1,464.7 nm are quite signiﬁcant which are used for health monitoring of thermonuclear machines.The optical thinﬁlmﬁlters which work on construc-tive and destructive interference are the ideal choices.Theseﬁlters are multi-layered with a pair of high and low refractive index dielectric materials.Signiﬁcantly high transmission index at the desired wavelength and relatively low transmission at the other wavelengths are desired.With this as the objective,it is necessary to design theﬁlter.Various optimization techniques are used for identifying the suitable design of theﬁlters.To choose the parameter combination that provides the most excellent performance,optimization of the design para-meters is entailed.The goal of this work is to improve the optical bandﬁlter using the Bald eagle search optimization(BES)method.The ideal design is determined by assessing several characteristics such as thickness,refractive index,Full-Width at Half-Maximum(FWHM),and the impact of choosing optical properties,which increases transmission potential.Initially,an alternate multi-layer stack with 28,30,and 32 layers is created by altering the thickness while keeping the dielectric substances high and low refractive indices constant.By adjusting the thickness of each layer,the BES algorithm achieves the best practical solution.The proposed method is implemented using MATLAB and the outcomes show the efﬁcacy of the proposed technique.The transmittance,reﬂectance,and FWHM using the pro-posed BES are found to be 99.9356%,0.065%,and 1.2 nm respectively.

关键词： optical filter dielectricmaterial bandpassfilter baldeagle optimization algorithm thickness and refractive index

A Novel optical filter for Removing Bright-Background Using an Enhanced Bacteriorhodopsin Thin Film

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Chinese Physics Letters 2003年第12期20卷 2161-2164页

作者：张春平顾立群陈桂英郭宗霞富光华张光寅张天浩李玉栋 Q.WangSONG PhotonicsCenter NankaiUniversityTianjin300071 MedicalCollegeforTianjinWorkers Tianjin300152 DepartmentofElectricalEngineeringandComputerScience SyracuseUniversitySyracuseNY13244USA

We found that the bacteriorhodopsin (bR) film has a special property of complementary suppression modulated transmission (CSMT). The yellow and the blue beams can be suppressed mutually when both the beams illuminate the bR film simultaneously. When the blue beam carrying an image with a bright-background noise illuminates on the bR film and then a yellow beam with uniform intensity distribution illuminates the same area, the bright-background can be removed due to the CSMT. In our demonstration, the pattern model is letters "VLSI" with ground noise of small words and the ground noise is removed from the pattern by the new optical filter.

关键词： Bacteriorhodopsins Noise ground bounce noise optical filter letter intensity distribution CSH1 gene bromine

Nanofluid-based optical filter optimization for PV/T systems

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Light(Science & Applications) 2012年第1期1卷 24-30页

作者： Robert A Taylor Todd Otanicar Gary Rosengarten University of New South Wales SydneyNSWAustralia University of Tulsa TulsaOKUSA RMIT University MelbourneVic.Australia

optical filters are essential in a wide range of applications,including optical communications,electronics,lighting,optical sensors and photography.This article presents recent work which indicates that optical filters can be created from specialized nanoparticle suspensions.Specifically,this article describes a theoretical optimization process for designing nanofluid-based filters for hybrid solar photovoltaic/thermal(PV/T)applications.This particular application is suitable because nanofluids can be utilized as both volumetric solar absorbers and flowing heat transfer mediums.The nanofluid filters described in this work compare favorably with conventional optical filters for five photovoltaic(PV)cell alternatives:InGaP,CdTe,InGaAs,Si,and Ge.This study demonstrates that nanofluids make efficient,compact and potentially low-cost,spectrally selective optical filters.

关键词： Hybrid nanofluid optical filter photovoltaic solar energy solar thermal

Application of metal oxides-based nanofluids in PV/T systems: a review

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Frontiers in Energy 2022年第3期16卷 397-428页

作者： Shahriar Ahmed KH.Nazmul Ahshan MdNur Alam Mondal Shorab Hossain Department of Mechanical Engineering Hajee Mohammad Danesh Science and Technology UniversityDinajpur5200Bangladesh Department of Engineering BGMEA University of Fashion and TechnologyDhaka1230Bangladesh

Having the wide application of metal oxides in energy technologies, in recent years, many researchers tried to increase the performance of the PV/T system by using metal oxide-based nanofluids (NFs) as coolants or optical filters or both at the same time. This paper summarizes recent research activities on various metal oxides (Al2O3, TiO2, SiO2, Fe3O4, CuO, ZnO, MgO)-based NFs performance in the PV/T system regarding different significant parameters, e.g., thermal conductivity, volume fraction, mass flowrate, electrical, thermal and overall efficiency, etc. By conducting a comparative study among the metal oxide-based NFs, Al2O3/SiO2-water NFs are mostly used to achieve maximum performance. The Al2O3-water NF has a prominent heat transfer feature with a maximum electrical efficiency of 17%, and a maximum temperature reduction of PV module of up to 36.9°C can be achieved by using the Al2O3-water NF as a coolant. Additionally, studies suggest that the PV cell’s efficiency of up to 30% can be enhanced by using a solar tracking system. Besides, TiO2-water NFs have been proved to have the highest thermal efficiency of 86% in the PV/T system, but TiO2 nanoparticles could be hazardous for human health. As a spectral filter, SiO2-water NF at a size of 5 nm and a volume fraction of 2% seems to be very favorable for PV/T systems. Studies show that the combined use of NFs as coolants and spectral filters in the PV/T system could provide a higher overall efficiency at a cheaper rate. Finally, the opportunities and challenges of using NFs in PV/T systems are also discussed.

关键词： metal oxide nanofluids(NFs) nanoparticles(NPs) optical filter PV/T systems solar energy

Analysis, design and simulation of MIM plasmonic filters with different geometries for technical parameters improvement

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Communications in Theoretical Physics 2020年第8期72卷 134-147页

作者： Sara Gholinezhad Shafagh Hassan Kaatuzian Mohammad Danaie Photonics Research Laboratory(PRL) Electrical Engineering DepartmentAmirkabir University of TechnologyTehranIran Electrical and Computer Engineering Faculty Semnan UniversitySemnanIran

In this paper, four optical filter topologies based on metal–insulator–metal waveguides are proposed and the designed structures are investigated numerically using finite-difference timedomain method. Triangular-shaped adjunctions have been added to the filter structures to improve their transmission spectrum. These improved structures consist of air as the insulator and silver as the metal. The relative permittivity of metal has been described via the Drude,Drude–Lorentz, and Palik models. The first filter’s transmission spectrum shows an acceptable transmittance. In the second optimized filter, the transmission spectrum has been improved. The transmittance spectrum can be tuned through adjusting the edge of the triangle in these four optimized filters. As a result, the bandwidths of resonance spectra can be adjusted. The theory of such tapered structures will be investigated by the tapered transmission line and will be solved with the transfer matrix method. This method shows a better performance and higher transmission efficiency in comparison with the basic structures. On the other hand, the final filter has been chosen as the best one because of its hexagonal resonator. The main reason for having a better result is due to a longer interaction length in comparison with the circular resonator. This in turn creates much better energy coupling and results in higher transmission.

关键词： plasmonics surface plasmon polariton(SPP) optical filter metal–insulator–metal(MIM)waveguide Drude model

Tunable plasmon-induced transparency based on asymmetric H-shaped graphene metamaterials

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Chinese Physics B 2018年第12期27卷 297-303页

作者：田雨宸贾微任佩雯范春珍 School of Physical Science and Engineering Zhengzhou University

We propose and numerically demonstrate a tunable plasmon-induced transparency(PIT) phenomenon based on asymmetric H-shaped graphene metamaterials. The tunable PIT effect is realized through varying the applied polarization angles rather than changing the structure geometry. By simply adjusting the polarization angle, the transmission spectra can be controlled between the switch-on state and switch-off state. The physical mechanism of the induced transparency is revealed from magnetic dipole inductive coupling and phase coupling. Importantly, by varying the Fermi energy of the graphene or the refractive index of the substrate, the resonant position of the PIT can be dynamically controlled and the maximum modulation depths can reach up to 60.7%. The sensitivity(nm/RIU) of the graphene structure, which is the shift of resonance wavelength per unit change of refractive index, is 5619.56 nm/RIU. Moreover, we also extend our research to the x-axis symmetric H-shaped structure, and the tunable PIT transmission window can also be realized. The physical mechanism of the induced transparency is revealed from the electric dipole hybridization coupling. Our designed H-shaped graphene-based structures is a promising candidate for compact elements such as tunable sensors, switches and slow-light devices.

关键词： plasmon-induced transparency graphene polarization optical filter

Linear optical signal processing with optical filters： a tutorial

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Frontiers of Optoelectronics 2016年第3期9卷 377-389页

作者： Xinliang ZHANG Zhao WU Wuhan National Laboratory for Optoelectronics (WNLO) School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

An effective theoretical analysis method is presented to analyze different linear optical signal processing functions with optical fikers reported in literatures. For different applications, the optical filters are supposed to operate on the analog or digital part of the signal separately, namely analog spectrum conversion and digital spectrum conversion. For instance, the return-to-zero （RZ） to non-return-to-zero （NRZ） format conversion for intensity or phase modulated signals are based on the analog spectrum conversion process, while the （N）RZ to （N）RZ phase-shift-keying （PSK） format conversion, logic NOT gate and clock recovery for RZ signals are based on the digital spectrum conversion process. Theoretical analyses with the help of numerical simulation are used to verify the reported experimental results, and all the experimental results can be effectively analyzed with this analytical model. The effect of the transmission spectrum of the filter on the performance of the converted signal is investigated. The most important factor is that the theoretical analysis provides an effective way to optimize the optical filter for different optical signal processing functions.

关键词： linear optical signal processing format conversion optical filter clock recovery logic gate

Extraordinary optical transmission through a subwavelength composite hole-pillar array

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Chinese Physics B 2014年第11期23卷 483-488页

作者：邵伟佳李为民许小亮王会杰吴以治郁菁 National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology University of Science and Technology of China Department of Physics University of Science and Technology of China

We numerically investigate the transmission properties of a subwavelength composite hole-pillar array. As the radius of the pillar increases, the transmission properties experience a complex evolution. It is found that the magnetic dipole resonance of the pillar suppresses the surface plasmon polariton resonance （SPPR） at the gold-air interface. There are two strong transmission peaks associated with the magnetic dipole resonance of pillar and SPPR at the gold-silica interface. A peak associated with magnetic quadrupole resonance of the pillar is observed. Moreover, there is a weak peak associated with the coupling between the whispering-gallery plasmon （WGP） mode and magnetic dipole. Our work is helpful for making a dual band optical filter.

关键词： surface plasmon polariton resonance （SPPR） transmission optical filter