軸對稱偏振光激勵表面等離子體共振及金屬納米顆粒增強熒光輻射的研究.pdf

1、中國科學技術大學博士學位論文軸對稱偏振光激勵表面等離子體共振及金屬納米顆粒增強熒光輻射的研究姓名：閻杰申請學位級別：博士專業(yè)：光學指導教師：明海魯擁華20100501AbstractAbstract111eresearchworkwithinthisdissertationissupportedbytheNationalKeyBasicResearchProgramofChina(No2006CB302905)，theKeyProgra

2、mofNationalNaturalScienceFoundationofChina(No60736037)，theNationalNaturalScienceFoundationofChina(No10704070)and∞onTheapplicationsofcylindricalvectorbeamsinsomespecialstructuretoexcitesurfaceplasmonresonanceandtheeffects

3、ofmetalenhancedfluorescencewithdifferentemissionfillthicknessarestudiedexperimentallyandtheoreticallyThemainresearchworksandhighlightsareaSfollowing：1Bystudythefocalcharacterofradiallypolarizedbeamsandlinearpolarizedbeam

4、s，wefindthatonlywhentheanglebetweenrefractlightandopticalaxislargerthan70degree，thefocalspotsizeofradiallypolarizedbeamsissmallerthanthelinearpolarizedbeamsfocalspotalongthepolarizationdirectionButitisstilllargerthanthes

5、potinperpendiculardirectionBythemethodofaddinanaperturediaphragm，thespotsizeofradiallypolarizedbeamscanbereduceThefocalspotwitllanaperturediaphragmofdiameterNA=Iissmallerthanthespotwithoutaperturediaphragmof064timesunder

6、thefocalNA=I4ThismethodisnotsuitforlinearpolarizedbeamssituationByusingradiallypolarizedbeams，thefocalspotsizeCanbereducedalongonedirectioninacertainrange2Westudythesensingpropertiesoffiberopticsurfaceplasmonresonanceusi

7、ngradiallypolarizedbeamsBecauseoftherotationalsymmetryofsensingfiberradiallypolarizedbeamshavehighefficiencytoexcitesurfaceplasmonandhavehighsensitivityBoththeexperimentandsimulationresultshowthesensitivityofradiallypola

8、rizedbeamsisabout3timeshigherthanthatoflinearpolarizedbeam3WestudytheapplicationofcylindricalvectorbeamsinleakyradiationmodemicroscopeexcitationstructureFirstwestudythecharacterofSPRexcitationofleakyradiationmodemicrosco

9、pebyimagingtheSPRleakymodeThenweobservetheimageonbackfocalplaneofobjectivelenstogettheinformationofsampleByusingradiallypolarizedbeamsilluminationitCanmeasurethethicknessofthinfilmaccurately(smallerthan100nrn)Theazimutha