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一种具有亚波长模式限制的三角楔形混合表面等离子激元波导传输特性研究(英文) Title:StudyontheTransmissionCharacteristicsofTriangularWedgePlasmonicWaveguideswithSubwavelengthModeConstraints Abstract: Plasmonicwaveguideshaveemergedaspromisingalternativestoconventionaldielectricwaveguidesduetotheirabilitytoconfinelightbelowthediffractionlimit.Inthisstudy,weinvestigatethetransmissioncharacteristicsoftriangularwedgeplasmonicwaveguides,whichincorporatesubwavelengthmodeconstraints.Theproposedwaveguidestructurecombinestheadvantagesoftriangularwedgeplasmonicwaveguidesandsubwavelengthmodeconfinement,offeringpotentialapplicationsinnanophotonicsandintegratedopticalcircuitry. Introduction: Thedemandfortheminiaturizationofphotonicdeviceshasdriventheexplorationofsubwavelengthmodeconfinementinplasmonicstructures.Surfaceplasmonpolaritons(SPPs)arecollectiveelectronoscillationscoupledtoelectromagneticwaves,enablingsubwavelengthlightconfinement.Thispaperfocusesontriangularwedgeplasmonicwaveguidesasameanstoachievesubwavelengthmodeconstraintsandtheirtransmissioncharacteristics. Methods: Theproposedwaveguidestructureconsistsofametal-dielectricinterfaceformedbyatriangularwedge.Themetalfilm,typicallygoldorsilver,supportstheSPPmodes,whilethedielectricmaterialisutilizedtocontrolthemodeconfinement.ThetransmissioncharacteristicsandpropagationlengthoftheSPPmodesareinvestigatedthroughrigorouscoupled-waveanalysisandfinite-differencetime-domainsimulations.Severalgeometricalparameters,suchasthewedgeangleandheight,arevariedtooptimizethemodeconfinement. ResultsandDiscussion: Theresultsdemonstratethatthetriangularwedgeplasmonicwaveguidewithsubwavelengthmodeconstraintscansignificantlyenhancethetransmissioncharacteristicscomparedtoconventionalplasmonicwaveguides.Thesubwavelengthmodeconfinementleadstoareducedmodesize,enablingstrongerlightconfinementandincreasedfieldintensity.Additionally,thewedgedgeometryoffersahigherdegreeofmodeconfinementcomparedtostraightwaveguides,duetotheincreasedeffectiverefractiveindexthroughtheapexregion. Furthermore,t