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过模波导的研究.docx

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过模波导的研究 1.Introduction Dielectricwaveguideoropticalwaveguideisastructurethatsupportsthepropagationofelectromagneticwavesalongitslengthbytotalinternalreflection.Thefirstofthesestructurestobeinvestigatedwasthecylindricalmetalwaveguide,butlater,theintroductionofdielectricmaterialslikeSiliconmadewayfordielectricwaveguides. Thestudyofdielectricwaveguideshasbeenofgreatinteresttoresearchersinthefieldofoptics,especiallyduetoitspracticalapplicationsinintegratedopticsandnanophotonics.Amongthevarioustypesofdielectricwaveguidesavailable,therectangularwaveguideisthemostcommonlystudied,duetoitssimplicityofdesignandeaseoffabrication.However,theattenuationanddispersioncharacteristicsofrectangularwaveguideslimittheiruseinsomeapplications. Thus,amoreeffectivedielectricwaveguidestructur,suchastheOvermodedwaveguide,wasintroducedinthemid-1980s.TheOvermodedwaveguide,alsoknownastheGuided-WaveOpticalInterconnect,hasbecomeapopularstructurefornanophotonictechnologiessinceitoffersseveraladvantagesincomparisontoconventionalwaveguidedesigns.ThispaperwillprovideanoverviewoftheOvermodedwaveguideandsomeofitsapplications. 2.Overmodedwaveguide TheOvermodedwaveguideisatypeofdielectricwaveguidethathasmultiplemodesofpropagation.Itisdesignedinsuchawaythatitcansupportthepropagationofmorethanonemode,thusallowingthetransmissionofalargeramountofpower.Thewaveguideistypicallyconstructedbysandwichingalowindexmaterial,suchasair,betweentwohighindexmaterials.Thisstructurecreatesawaveguidewithanenlargedcross-sectionalarea,whichcansupportmultiplemodesofpropagation. AnOvermodedwaveguidecanbedesignedforsingle-modeormulti-modeoperation,dependingontheintendeduse.Insingle-modeoperation,thewaveguidesupportsonlythelowestordermode,andinmulti-modeoperation,thewaveguidesupportsseveralmodesofpropagation.ThetransmissioncharacteristicsofanOvermodedwaveguidedependonvariousparameters,suchasthewaveguidedimensions,refractiveindex,andthemodeorder. 3.AdvantagesofOvermodedwaveguide OneofthemainadvantagesoftheOvermodedwaveguideisitshig