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1、浙江工业大学硕士学位论文ANALYSISOFTHETUNABLEGRADIENTREFRACTIVEINDEXANDDEVICEDESIGNBASEDONOPTOFLUIDICSABSTRACTAsanewtechnology,optofluidicsisthesubjectsaccumulationofmicrofluidicsandintegratedoptics,whichhasanextensivepracticingprospectinchemicalanalysis,biologicaldetectionandintegratedoptics.Thelab-
2、on-a-chipapplicationcanbothreducethecostofchemicalorbiologicaldetectionandimprovetheanalysisaccuracy.Inthispaper,atunableliquidgradientrefractiveindex(L-GRIN)microlenswasproposedbasedonthelaminarliquidconvectionanddiffusioneffect.Theeffectofvariousliquid/devicefactors,includingthestructu
3、reandsizeofdevice,theflowvelocity,concentration,viscousresistanceandtemperatureofliquids,etc.,onthediffusionconvectionprocessofliquids,aswellastheconcentrationandrefractiveindexdistributionofL-GRINmicrolensunderdifferentconditionswassimulatedbyFiniteelementmethod(FEM).Furthermore,thecorr
4、elationbetweenIII万方数据浙江工业大学硕士学位论文thediffusionconvectionprocessoffluiddynamicsandtheopticalpropertyofmicrolenswasestablishedbysimulatingthefeaturesofwave-manipulationofL-GRINmicrolensusingraytracingmethod,andtheinvestigationsprovidedmoreunderstandingtothetuningmechanismofL-GRINmicrolensat
5、molecularlevel.ThreekindsoftunableL-GRINmicrolensweredesignedtorealizedifferentfocusingeffectbyadjustingthediffusioncoefficient,solutionconcentrationandflowratesofcoreandcladdinginlet,andthelighttransmissionprocessandfocusingeffectofdeviceswasanalyzesusingraytracingmethod.Itwasfoundthatt
6、hefocallengthofthemicrolensvariedfrom942µmto11µmwhenthemassfractionofethyleneglycolsolutionvariedfrom0.05to0.4,whilethefocallengthchangedfrom127.1µmto8µmbyvaryingtheflowrateofcoreliquidfrom330.5×10pL/sto5×10pL/swhentherearenoslipbetweencoreandcladdinginlet.Astheflowrateofcoreinletincreas
7、ingrapidlywiththatofcladdinginletbeingconstant,therefractiveindexwillkeepunchangedatthecentreofthearea,thusthefocalspotofoutputlightwillmaintainasteadydiameterof23.5μm.Theadjustmentoffocalspotsizecanbeimplementedinthesamemanner.Inaddition,bothone-dimensional(1D)andtwo-dim
