掃描近場(chǎng)光學(xué)顯微鏡中衍射偏振效應(yīng)的研究.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文掃描近場(chǎng)光學(xué)顯微鏡中衍射偏振效應(yīng)的研究姓名：吳衛(wèi)民申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：光學(xué)指導(dǎo)教師：謝建平2000.5.1AbstractUsingcompletelyinnovativeimagingtechnology，ScanningNear—FieldMicro—scopy(SNOM)callproducesubwavelengthresolution，whichovercomesthedif抒actionres

2、olutionlimitofconventionalopticalmicroscopybecomingakindofextremelypowerfult001inthefieldsofnanometricmaterial，surfacescienceandbiologicalengineeringInthisthesis，weoutlinethedevelopmentofSNOM，basicprinciplesandsetup，andt

3、hensummarizeitsprospectiveapplicationsinthefieldsofscienceandtechnologyTheresolutionofSNOMisrestrictedbythesizeofprobeapertureandobservationdistancenamelydeterminedbythesizeofnearfielddiffraction(NFD)paRemsSotheanalysiso

4、fnearfielddiffractionisveryimportant0urintentionofthiswokistointroducetheboundarywavetheoryintothenearfielddifiractionandtoformtheBoundaryWaveMetllodfornearfielddifiractionThemaincontentofthisthesisincludesthreepartsAtfi

5、rstwestudythestraightedgediffractionproblemofidealconductingscreenthorou曲lyForitisthesimplestcaseinthedifiraction，straightedgeproblemcanbeusedtotestthevalidityofdiffractiontheoriesOorresearchshowsthattheamplitudedistribu

6、tionofstraightedgedifiractiongivenbyboundarywavetheoryunderKirchoffsboundaryconditionsiscoincidentwiththeelectricfieldgivenbyrigidelectromagnetictheoryandtheamplitudedistributiongivenbyboundarywavetheoryunderRayleigh—Som

7、merfield’sboundaryconditionsiscoincidentwiththemagneticfielddistributiongivenbyrigidelectromagnetictheoryThesetwoformsoftheorieshavedifierenceonlyinthenearfieldwhichareidenticalinthefarfieldnlesolutionofstraightedgeprobl

8、emprovedthattheboundarywavemethodisalsoapplicableinthenearfieldInthesecondpart，takingintoaccountthephasechangewhentheboundarywaveisscaaeredattheedgeofmetalscreen，weputmuchmoreemphasisonthesolutionofpolarizationeffectinne

9、ar—fielddifiractionofslitandtireularaDertureWefindthattheenergyofdiffractedwaveunderske：pticalincidentlight(electriccomponentverticaltotheincidentplane，calledswave)，ismainlyconcentratedintllecentralareaofaperture’sgeomet

10、ricalprojecfion，withabelllikestructure；butforparallelincident1iglt(electriccomponentintheincidentplanecalledpwave)，theenergydistributionhastwopeaksneartheregionofapertureedge’sgeometricalprojection，withavalley1ikestructu

11、renleseresultSareingoodagreementwiththatofLNovotnyandARobertsgotbyothermethodsBoundarywavemethodhasthefollowingadvantage：consideringthedifferenceofdifferentpolarizedincidentlight，wecandiscusstherelevantdiffractionandstud

12、yitspolarizationeffectinthescalartheoryframeWehaveamoreprofoundunderstandingofnearfielddiffractionbyboundarydiffractionmethodFinallyweconsidertherelationofpolarizationeffectwiththeindexofmetalscreenintheslitnearfielddiff