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ID:34816807
大小:2.95 MB
页数:42页
时间:2019-03-11
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1、Chapter5NanoscaleopticalmicroscopyAfterhavingdiscussedthepropagationandfocusingofopticalfields,wewillnowstarttobrowsethroughthemostimportantexperimentalandtechnicalconfigurationsemployedinnanoscaleopticalmicroscopy.Varioustopicsdiscussedinthepreviouschapterswillberevisitedfromanexperiment
2、alperspective.Wewilldescribeherebothfar-fieldandnear-fieldtechniques.Far-fieldmicroscopy,scanningconfocalopti-calmicroscopyinparticular,isdiscussedbecausethesizeofthefocalspotroutinelyreachesthediffractionlimit.Manyoftheexperimentalconceptsthatareusedinconfocalmicroscopyhavenaturallybeentra
3、nsferredtonear-fieldopticalmicroscopy.Inanear-fieldopticalmicroscopeananoscaleopticalprobeisrasterscannedacrossasurfacemuchsimilarasinAFMorSTM.Wewillseethatthereisavarietyofpossi-bleexperimentalrealizationsforscanningnear-fieldopticalmicroscopywhilee.g.forAFMandSTMa(moreorless)uniquesetupe
4、xists.ThemaindifferencebetweenAFM/STMandnear-fieldopticalmicroscopyisthefactthatinthelatteringeneralanopticalnear-fieldhastobecreatedatthesampleorattheprobeapexinthefirstplace.Thisisdonebyexternalilluminationeitherinthefarfieldorinthenearfield.Asimilarsituationexistsforthedetectionofanear-fiel
5、dsignal.Itcaneitherbedetecteddirectlyinthenear-fieldzoneoritmaybeconvertedtopropagatingwaveswhichcanthenbedetectedinthefarfield(seesection4.6.1).Theresultingcom-binationsofnear-field/far-fieldilluminationandnear-field/far-fielddetectiondefinethepossibleexperimentalrealizationsofnanoscaleoptica
6、lmicroscopies.Table5.1categorizesandsummarizesaselectionofsuchconfigurations.141142CHAPTER5.NANOSCALEOPTICALMICROSCOPYIlluminationnear-fieldnear-fieldfar-fieldfar-fieldDetectionnear-fieldfar-fieldnear-fieldfar-fieldreflectionqcforbiddenSetupsallowedTable5.1:Summaryofpossibleconfigurationsinscanni
7、ngnear-fieldopticalmi-croscopycategorizedbytheilluminationanddetectionprinciple.5.1Far-fieldilluminationanddetection5.1.1ConfocalmicroscopyConfocalmicroscopyemploysfar-fieldilluminationandfar-fielddetectionandhasbeendiscussedpreviouslyinsection4.3.Despitethelimitedbandwidthofspatia
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