简介：Plasmonicwaveguides,asacompetitivecandidate,havebeenwidelystudiedinrapiddevelopingphotonicintegratedcircuits(PICs)andopticalinterconnectionfields.However,crosstalkbetweenplasmonicwaveguidesisacriticalissuethathastobeconsideredinpractice.Actually,crosstalkdominatestheultimateintegrationdensityoftheplanarphotoniccircuits.Thispaperreviewstherecentresearchworkonevaluationmethodsandcrosstalksuppressionapproachesofplasmonicwaveguides.Threecrosstalkevaluationmethodsbasedoncomparisonofspecificparametersofwaveguideshavebeensummarized.Furthermore,fourspecificapproachestoreducecrosstalkhavebeenillustratedastwocategoriesaccordingtotheirimpactsonwaveguideperformancesandthewholecircuit.Onemeansofcrosstalksuppressionischangingtheplacementofwaveguides,whichcouldmaintainthetransmissioncharacteristicsoftheoriginalwaveguide.Theothermeansisinsertingmedium,whichhastheadvantageofoccupyingsmallerspacecomparedtothefirstmethod.Consequently,tosuppresscrosstalkbetweenplasmonicwaveguides,oneshouldchoosesuitableapproach.

简介：Asimplesolutionforamultilayermetallicopticalwaveguidebytransformingitintoanequivalentthree-layerslabwaveguideispresented.Thedispersionrelationoftheequivalentthree-layerslabwaveguideissolvedbyusingasimpleiterativeformula.Thismethoditselfisexactandcanapproachanyaccuracydesired.Moreover,thenumericalresultsforfour-layerandfive-layerstructuresshowthatthesecond-ordersolutionisalsoaccurateenough.ItissimpleandhasthesameformofexpressionsforTEandTMmodesandfordifferentlayerstructures.

简介：三维的弄弯的多重槽的波导的弯曲效率被使用有效索引、修改的转移矩阵方法的一个联合方法学习。不对称的结构，不对称的槽，和弯曲效率上的不对称的中间的脱衣的效果被调查。我们证明弯曲效率能被不对称的结构和不对称的中间的脱衣的使用改进。不同的槽波导的弯曲效率(直到五倍槽的结构)被比较。尽管单个槽的波导一般来说为一样的波导参数提供最低弯曲损失，多重槽的波导能比单个槽的介绍更低的弯曲损失，是可能的，这被揭示。

简介：Asimplesetupforthemeasurementoftransmissionlossinpolymerthinfilmopticalwaveguidesisdescribed.Anewelectro-opticpolymerfilmhasbeenprepared.Thetransmissionlossofthefilmismeasuredbeforeandaftercoronapoling.Andthelossisdeterminedtobe1.84dB/cmand2.14dB/cm,respectively.

简介：Thehigh-temperaturesensitivityofthesiliconmaterialindexlimitstheapplicationsofsilicon-basedmicro-ringresonatorsinintegratedphotonics.Torealizealowbutbroadbandtemperature-dependent-wavelength-shiftmicroringresonator,designingabroadbandathermalwaveguidebecomesasignificanttask.Inthiswork,weproposeabroadbandathermalwaveguidethatshowsaloweffectivethermo-opticalcoefficientof1×10-6∕Kfrom1400to1700nm.Theproposedwaveguideshowsalow-lossperformanceandstablebroadbandathermalpropertywhenitisappliedtoringresonators,andthebendinglossofringresonatorswitharadiusof>30μmis0.02dB/cm.

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简介：Openwaveguidesarewidelyusedinmodernphotonicdevices,suchasmicrostructuredfiberfiltersandsensors.Theirabsorptionandtransmissionspectraarethemostimportantpropertiesindeterminingtheoverallperformanceofthephotonicdevices.Theimaginarypartsoftheireigenvalueshavebeencommonlyusedtocalculatetheabsorptionandconsequentlythetransmissionspectra.Hereweshowthatthisformulismisgenerallyincorrectandnotconsistentwiththesimulationresultsobtainedbythebeampropagationmethod.Werevisitthefundamentaltheoryfortheabsorptionofopenwaveguidesandpresentageneralformulism.Wefoundthatparity-time-symmetrytransitions,whichhavebeenconventionallyignored,playacriticalroleinthepropertiesofthecoupledwaveguide.Theabsorptionandtransmissionarehighlydependentonthephysicallengthofthesystem.Onthebasisofourfindings,optimizationcriteriafordesigningphotonicsensorsandfiltersarepresented.

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简介：Therearesomecurvedinterfacesinoceanacousticwaveguides.Tocomputewavepropagationalongtherangewithsomemarchingmethods,aflatteningoftheinternalinterfacesandatransformingequationareneeded.Inthispaperalocalor-thogonalcoordinatetransformandanequationtransformationareconstructedtoflatteninterfacesandchangetheHelmholtzequationasasolvableform.Forawaveguidewithaflattop,aflatbottomandncurvedinterfaces,thecoefficientsofthetrans-formedHelmholtzequationaregiveninaclosedformulationwhichcanbethoughtofasanextensionoftheformalworkrelatedtotheequationtransformationwithtwocurvedinternalinterfaces.Inthetransformedhorizontallystratifiedwaveguide,theone-wayreformulationbasedontheDirichlet-to-Neumann(DtN)mapisthenusedtoreducetheboundaryvalueproblemtoaninitialvalueproblem.NumericalimplementationoftheresultingoperatorRiccatiequationusesalargerangestepmethodtodiscretizetherangevariableandatruncatedlocaleigenfunctionexpansiontoapproximatetheoperators.Thismethodisparticularlyusefulforsolvinglongrangewavepropagationproblemsinslowlyvaryingwaveguides.Furthermore,themethodcanalsobeappliedtowavepropagationproblemsinacousticwaveguidesassociatedwithvarieddensity.

简介：Slowlight,atechnologytocontroltheopticalsignalbyreducingthegroupvelocity,hasbeenwidelystudiedtoobtainenhancednonlinearitiesandincreasedphaseshiftsowingtoitspromotingofthelight–matterinteractionability.Inthiswork,awidebandslowlightisachievedinasimpleone-dimensionalfishbonegratingwaveguide.Aflatbandindicatingslowlightwithagroupindexof13andbandwidthover10nmisobtainedbytheplanewaveexpansioncalculation,andthecorrespondingexperimentalresultsagreewellwiththetheoreticalprediction.Asteptaperisdesignedtocompensatethecouplingloss.Theproposedfishbonegratingwaveguideisagoodcandidateforwidebandslowlightdevicesinlightcommunication.

简介：ＴｈｅＥｑｕｉｖａｌｅｎｔＰａｒａｍｅｔｅｒｓｏｆａｎＩｎｃｌｉｎｅｄＳｌｏｔｉｎＴｗｏＣｒｏｓｓｅｄＷａｖｅｇｕｉｄｅｓｗｉｔｈＲａｄｉａｔｉｎｇＳｌｏｔｓ￥ＬｕｅＳｈａｎｗｅｉ＆ＴａｎｇＨｏｎｇｚｈｅｎ（ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅ...

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简介：TheRPSmethod,whichintegratestherealnumericalsolution,theperturbationsolutionandtheshootingsolutionreasonably,canobtainthecomplexsolutionofaslabwaveguidewithsmallgain/lossregionswithoutsearchingtherootintheentirecomplexplan.ArevisiontotheRPSmethodispresentedsothatitcandealwiththewaveguideincludinglargegain/lossregions.Theapplicationindicatedthatthesimulationresultsareprecise.

简介：Thedesignofanovelphotoniccrystalwaveguidepowersplitterispresented.Theproposedpowersplitterhasthreeoutputports,thecouplingamongthreeparallelphotoniccrystalwaveguidescanbeconsideredasamultimodeinterference(MMI),andthepositionsofoutputwaveguidesaredeterminedbythoseoftwofoldimageswhichareformedbytheself-imagingeffectofmultimodeinterference.Thetransmissioncharacteristicsofthesplitterareinvestigatedbyusingthefinite-differencetimedomain(FDTD)andtheplanewaveexpansionmethod.Theoutputopticalpowerineachportcanbecontrolledbyadjustingtheradiusofthedielectricrodsinthecouplingregion,andthecouplingeffectamongoutputportsisdecreasedbyusingtheT-shapedoutputport.Theresultsindicatethat1×1,1×2and1×3typepowersplitterscanberealizedwhenthenormalizedradiusofdielectricrodsinthecouplingregionis0.130,0.180,0.152or0.221,respectively.

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简介：有极端协议、简单的结构的波长splitter被使用两飞机波浪扩大(PWE)建议并且分析方法和有限差别时间领域(FDTD)方法。设备基于在二平行的锂niobate之间的方向性的联合(LiNbO3，行)nanowire光波导。有5m的acoupling区域长度的波长splitter能比97%高用发射度为相应产量分开1.31m和1.55m波长。

简介：OpticalsimulationsofGaAs/AlGaAsthin-filmwaveguideswereperformedforinvestigatingthedependenceofthemodalbehavioronwaveguidegeometryandtheresultinganalyticalsensitivity.Simulationswereperformedfortwodistinctmid-infraredwavelengths,therebydemonstratingthenecessityofindividuallydesignedwaveguidestructuresforeachspectralregimeofinterest.Hence,themodalbehavior,sensitivity,andintensityoftheevanescentfieldwereinvestigatedviamodelingstudiesat1600and1000cm-1,therebyconfirmingtheutilityofsuchsimulationsfordesigningmid-infraredsensorsbasedonthin-filmwaveguidetechnology.

简介：Wedemonstrateanovelhigh-accuracypost-fabricationtrimmingtechniquetofine-tunethephaseofintegratedMach–Zehnderinterferometers,enablingpermanentcorrectionoftypicalfabrication-basedphaseerrors.Theeffectiveindexchangeoftheopticalmodeis0.19inourmeasurement,whichisapproximatelyanorderofmagnitudeimprovementcomparedtopreviousworkwithsimilarexcessopticalloss.Ourmeasurementresultssuggestthataphaseaccuracyof0.078radwasachievablewithactivefeedbackcontrol.

简介：WediscussthenonlinearSchrdingerequationwithvariablecoefficientsin2Dgraded-indexwaveguideswithdifferentdistributedtransversediffractionsandobtainexactbrightanddarksolitonsolutions.Basedonthesesolutions,wemainlyinvestigatethedynamicalbehaviorsofsolitonsinthreedifferentdiffractiondecreasingwaveguideswiththehyperbolic,GaussianandLogarithmicprofiles.Resultsindicatethatforthesameparameters,theamplitudeofbrightsolitonsintheLogarithmicprofileandtheamplitudeofdarksolitonsintheGaussianprofilearebiggestrespectively,andtheamplitudeinthehyperbolicprofileissmallest,whilethewidthofsolitonshastheoppositecase.