学科分类
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3 个结果
  • 简介:Theemergingperfect-absorbermetamaterials(PAMs)provideanalternativematerialapproachforthenextgenerationofelectromagneticdetectionatanyfrequencybandofinterest.Onetypeofdualcross-shapedPAMsisdevelopedtoobtainmultiplex-bandspectrumabsorptionatmid-infraredregion.Threedistinctabsorptionpeaksareattributedtothepolarizationsensitivityexcitationoftheplasmonicresonance.Thechargedensitydistributions,whichareexcitedbyresonantelectromagneticwavespassingthroughthePAMsmedium,provideinsightsintotheobservedabsorptionbehavior.WefindthattheretrievedopticalpropertiesofthePAMsincludingpermittivityandpermeabilityarestillconsistentwiththesumoftheDrudeandLorentztypemodelsatwavelengthsrangingfrom2.0to10.0mm.Suchmultiplex-bandabsorptionpropertiesenabletheproposedPAMsapowerfultoolforthedirectdetectionofmultiplemolecularvibrationalstructures,andformultiplespectrainfrareddetection.

  • 标签: 红外吸收剂 偏振灵敏度 光谱 多频带 PAMs 电荷密度分布
  • 简介:Thetunablemultipleplasmon-inducedtransparency(PIT)effectisinvestigatednumericallyinametal-insulator-metal(MIM)waveguidewiththreeside-coupledrectangularresonators.Thesystemexhibitsdual-modePITeffectsinthevisibleandnear-infraredregions.Byadjustingthegeometricalparametersofthestructure,wecanmanipulatenotonlyeachsinglePITwindow,butalsothedoublePITwindowssimultaneously.Ourstructuresmayhavepotentialapplicationsforopticalcommunication,integratedoptics,andopticalinformationprocessing.Thefiniteelementmethod(FEM)illustratesourtheoreticaldesign.

  • 标签: 等离子体激元 可调谐 诱导 透明性 矩形腔 金属-绝缘体
  • 简介:Anoptimalpowerdistributionanalysisforanall-opticalsamplingorthagonalfrequencydivisionmultiplexing(OFDM)schemewithmultiplemodulationformatsincludingdiferentialphaseshiftkeyed(DPSK),diferentialquadraturephaseshiftkeyed(DQPSK),andnon-return-to-zero(NRZ)isproposed.Thenoisetolerancesofdifferentmodulationformatsareanalyzed,andtheoptimalinputpowerratiobetweenphaseandintensitymodulationformatsforthebestoverallreceivingperformanceisinvestigatedunderunchangedtotalinputpower.Moreover,thisschemecanseamlesslycoexistwiththetraditionalWDMchannel.

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