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ID:39888798
大小:1.95 MB
页数:33页
时间:2019-07-14
《Metal optics near the plasma frequency》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Festk6rperproblemeXXll(1982)MetalOpticsNearthePlasmaFrequencyFrankForstmannandRolfR.GerhardtsFreieUniversit~tBerlin.InstitutfiirTheoretischePhysik,Berlin,FederalRepublicofGermanySummary:Neartheplasmafrequencyspatialdispersionisanimportanteffectinmetaloptics,sinceitleadstoopticalexcitation
2、ofplasmawaves.Weoutlineanextensionoflocalmetaloptics,whichtakesthiseffectintoaccountviathehydrodynamicalapproximationfortheelectronmotionandappropriateadditionalboundaryconditions.Wediscussanumberofsuccessfulapplicationsincludingananalysisofthefieldsnearthesurface.Finally,wereviewothermet
3、hodsdealingwithnonlocalopticsnearametalsurfaceandcommentonthetheoreticallimitationsandpracticalmeritsofthehydrodynamicalapproach.IntroductionStandardopticsformetalsaswellasforsemiconductorsandinsulatorsisbasedontheassumptionthatonlytransverseelectromagneticplanewavescanpropagateinthemater
4、ial,becausethenetchargeinsideiszero,whichmeansdivE=0,i.e.k-E=0[1].Athigherfrequencies(~=10Is-1016Hz)theinertiaoftheconductionelectronsinmetalspreventsinstantscreening.Chargedensitywavescanbuildup,theplasmawavesdiscoveredbyBohmandPinesinthefifties[2,3].In1964Sauterpointedout[4],thattheselo
5、ngitudinalplasmawavesshouldbeincludedinmetaloptics.Hepublishedin1967atreatmentofthereflectionfromametalsurface[5]togetherwithamicroscopicfoundationbyForstmann[6].UsingthemacroscopicapproachofSauter,MelnykandHarrisonderivedresonancesinthinmetalfilmsduetoopticallyexcitedstandingplasmawavesi
6、nthelayers[7].Theseresonancesweredetectedin1970/71[8,9]andwerethedirectproof,thatplasmawavesareexcitedoptically.Theoreticalinvestigationscontinued(see[10,11])butonlyinrecentyearsopticalexperimentshavereachedadegreeofsophisticationthatthedeviationsfromthepredictionsofstandardopticsduetopla
7、smawaveexcitationsbecameimportant.ThedemandforasimpleandflexibletheoryledtoarevivalofSauterspragmaticextensionofstandardopticsandtoafurtherextensiontothecaseofaninterfacebetweentwometalsbyForstmannandStenschke[12].WepresentinChapterItheproblemofopticsatasurface(nont
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