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1、SurfacePlasmonPolaritons(SPPs)-Introductionandbasicproperties-Overview-Light-matterinteraction-SPPdispersionandpropertiesStandardtextbook:-HeinzRaether,SurfacePlasmonsonSmoothandRoughSurfacesandonGratingsSpringerTractsinModernPhysics,Vol.111,SpringerBerlin1988Overvie
2、warticlesonPlasmonics:-A.Zayats,I.Smolyaninov,JournalofOpticsA:PureandAppliedOptics5,S16(2003)-A.Zayats,et.al.,PhysicsReports408,131-414(2005)-W.L.Barneset.al.,Nature424,825(2003)OverviewOverviewReplace‘slow’electronicdeviceswith‘fast’photoniconesPhotoniccrystalsSPsi
3、sthewaytoconcentrateandchannellightusingsubwavelengthstructuresSPsstructuresattheinterfacebetweenametalandadielectricmaterialTransversemagneticincharacterÆelectricfieldnormaltothesurfacePerpendiculardirectionÆevanescentfieldMomentummismatchintheSPdispersioncurveOverv
4、iewOverviewsurfaceplasmonpolaritonoptics(SPP)Band-gapeffects,SPPwaveguidingalongstraightandbentline,GoldstripesOverviewOverviewenhancedopticaltransmissionElementaryexcitationsandpolaritonsElementaryexcitationsandpolaritonsElementaryexcitations:•Phonons(latticevibrati
5、ons)•Plasmons(collectiveelectronoscillations)•Excitions(boundstatebetweenanexcitedelectronandahole)Polaritons:Commonlycalledcoupledstatebetweenanelementaryexcitationandaphoton=light-matterinteractionPlasmonpolariton:coupledstatebetweenaplasmonandaphoton.Phononpolarit
6、on:coupledstatebetweenaphononandaphoton.PlasmonsPlasmonsAplasmonisthequantumofthecollectiveexcitationoffreeelectronsinsolids.Electronplasmaeffectsaremostpronouncedinfree-electron-likemetals.Thedielectricconstantofsuchmaterialscanbeexpressedas2⎛⎞ωpεω()1=−⎜⎟m⎝⎠ωω<ωÆε<0
7、ÆwavevectoroflightinthemediumisimaginaryÆnopmpropagatingelectromagneticmodesω>ωÆε→1ÆalteredbyintrabandtransitionsinnoblemetalspmAcombinedexcitationconsistingofasurfaceplasmonandaphotoniscalledasurfaceplasmonpolariton(SSP).Ædifferentnature,suchasphonon–polariton,excit
8、on–polariton,etc.PlasmonsPlasmons23−3•freeelectronsinmetalaretreatedasanelectronliquidofhighdensityn≈10cm•longitudinaldensityfluctu
