光微流耦合回音壁模式微腔激光的传感器的分析

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1、万方数据ABSlRACT—●-__●——————●—_—————-_-—————————‘——～———————————。一—^——●—●———————H●H__●-●-__-_-_-_H-—。-_●-——●——————————————-—_____—_一ABSTRACTWhispering—gallery—mode(WGM)microcavityscanconfinelightinthedimensionofmircometersbytotalinternalreflection．Usuallytheypossesshi．ghqualityfactoran

2、dsmallmodevolumewhichareconducivetoenlargingthein：mraetionareaandincreasingtheinteractiontimebetweenlightandanalyte，thus’theycanrealizehighsensitivityandlowdetectionlimitforlabel—freeopticalbio—sensing,especiallyforsingleparticledetection．Currently,theresearchthatusingsingleWGMmic

3、rocavityassensingcomponentislimitedbythestructureofmicrocavityandsignalresolution，andtheirbestperformanCOislessthan1000nm／RIUforbulkrefractiveindexdetectionand12．5nininradiuspolystyrenesphereforparticledetection．InordertoimprovethesensingperformanceofWGMmicrocavity,manyenhancingme

4、chanicshavebeenintroduced，includingactivemicrocavity,plasmon，cascadedorcoupledmicrocavityandopticaltweezer．Thisthesiswillfocusonthedesign，fabricationandmeasurementofultrahighsensitiveopticalbio—sense[basedonthecoupledoptofluidicmicrocavitystructure．Themainresultsinclude：1．Theoreti

5、cally,theWGMsinsingleoptofluidiCringresonator(OFRR)andtheirsensitivityhavebeenanalyzed．Basedontheexperimentalstructure，weanalyzedtheamplificationofthemodesensitivitywhendifferentorderofmodeswerecoupledwitheachotheraccordingtotheVerniereffect．Theresultsshouedthatinourexperiment，the

6、mnplifiedsensitivitybytheVerniereffectcouldreach103_105nm／RIUforbulkrefractiveindexdetection．whichisseveralo,'de℃sofmagnitudegreaterthantheutmostsensitivityofsingleOFRR．ThesensitivitylimitationofsingleOFRRcouldbebrokenthroughbythecoupledOFRRstructure．2．Weinvestigatedthecouplingare

7、aofon—chipcoupledmicrodisks姆focusedbeamheatingmethodcxpcrimentally．Andtheresultsshowedthatthespecialpropertiesofcouplingareadidn’tinfluencetheVerniereffectofcoupledWGMmicrocavitylaser．Inthisexperiment，a532nltlCWlaserbeamwasfocusedassmallas40btmindiametertoheatdift、erentareasofRhBd

8、opedcoupledSU．8microdisks．resulti