金属纳米半球壳阵列的表面拉曼散射增强效应

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1、金属纳米半球壳阵列的表面拉曼散射增强效应作者：陈玲导师：王振林教授南京大学物理学院固体微结构物理国家重点实验室EnhancedSurfaceRamanScatteringEffectofQuasiThree．．DimensionalMetallicHalfShellArraysT垤icrostructuresByLingChenSupervisedbyProf．ZhenlinWangNationalLaboratoryofSolidStateMicrostructureSchoolofPhysicsNanji

2、ngUniversity种尖端效应导致开口朝上的与开口朝向玻璃基底的空心半球壳结构具有更强的拉曼散射信号。而在共振带边缘激发的情况，开口朝上的半球壳腔内有较强的场增强，虽然吸附在球壳表面的分子没有处在这个强场中，但是这个强场可以引起分子吸光率的提高，进而增强分子的拉曼信号。腔内强场作用与尖端效应共同使得在共振附近激发情况下，开口朝上的半球壳阵列所产生的分子拉曼散射信号比开口朝向衬底时强五倍。THESIS：EnhancedSurfaceRamanScatteringEffectofQuasiThree．Dime

3、nsionalMetallicHalfShellArraysMicrostructuresSPECIALIZATION：CondensedMatterPhysicsPOSTGRADUATE：LingChenⅣ匝NTOR：Prof．ZhenlinWangAbstractInthispaper,westudythesurface-enhancedRamanscattering(SERS)effectofplasmoniccrystals(PCs)whichcomposedofquasithree-dimensio

4、nal(3D)metallicperiodicmicrostructures．ThroughtheRamanscatteringofthePCsandthefinite．di仃erencetime．domaincalculations，weinvestigatetherelationshipbetweenehhancedRamanscattingandthepropertiesofthestructural，whichCanbedividedintothefollowingthreeparts：Inthefi

5、rstpart。anapproachofnanospherelithography(NSL)tofabricatequasi．3DPCsbydepositingathingoldlayerontoatwo-dimensional(2D)arrayofsilicamicrospheresself-assembledonaquartzsubstrate，followedbyremovalofthesacrificialtemplate．Thenovelquasi．3DPCsarecomposedofinterco

6、nnectedmetalhollowhalfshellssupportedonaplanardielectricsubstrate．Basedondifferentmethodsofremovalofthesacrificialtemplate，thedifferentopeningorientationofinterconnectedmetalhollowhalfshellssupportedonaplanardielectricsubstrateareacquimd．Inthesecondpart，weh

7、aveinvestigatedtheresonanttransmissionpropertiesofthenovelquasi．3DPCswhicharecomposedofinterconnectedmetalhollowhalfshellssupportedonaplanardielectricsubstrate．Inthispaper，wefurtherstudytheSERSofthenovelquasi．3DPCs．Itisfoundthatthenovelquasi-3DPCsshowalarge

8、SERSeffectandthemeasuredRamansignalenhancementshowsanoticeabledifferenceonthehalfshellorientationrelativetothepumpbeamwavevector．Attheexcitationwavelengthoutsidetheplasmonicmode，theonanupwardgoldhalfsh