基于微纳光纤激发微腔wgm的高灵敏度折射率传感器设计的研究

《基于微纳光纤激发微腔wgm的高灵敏度折射率传感器设计的研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、基于微纳光纤激发微腔WGM的高灵敏度折射率传感器设计研究AbstractInrecentyears,theWhisperingGalleryMode(WGM)basedtransmissionopticalmicro-resonatorhasgraduallybecomeahotresearchtopicinthefieldofsensing.Thedevelopmentofpreparationtechnologyhasledtoanincreasingnumberofmicro-cavitytypesandincr

2、easinglywideapplicationareas.Micro-resonatorhasadvantagesofsmallsize,highsensitivity,noneedoflabeling,andlowsampleconsumption,resultingintherapiddevelopmentinthefieldofbiochemicalsensing.Thispapercarriesoutdesignandresearchofhighsensitivitysensorbasedonthemicro-

3、nanofiberexcitationmicrocavity,whichcanbeusedforthedeterminationofphysical,chemical,andbiologicalpropertiesofsurroundingmedium.Itisofgreatimportancebothforpracticalapplicationsandscientificresearch.Thispaperfirstintroducestheopticalpropertiesofthemicro-nanofiber

4、andmicrocavities(includingthemicrospheresandmicrotubules).Theoreticalmodelsarebuilt.Thecharacteristicsofmodefielddistributioninmicro-nanofibersareanalyzedbyscalarapproximationmethodandvectormethod.Therelationsbetweenmicro-nanofiberparametersandevanescentfielddis

5、tributionareobtained.ThemodefieldofmicrocavityWGMisdescribed.Thecharacteristicequationofthemostimportantparameter--resonantwavelengthisderivedbyusingboundaryconditions.ThecharacteristicsofWGMareanalyzedbysimulation.Theeffectsofboththicknessandrefractiveindexofmi

6、crotubulesonthemodefieldofmicrocavityWGMareanalizedimportantly.Thenthetheoreticalmodelofmicro-nanofiberexcitationmicrosphereresonantcavityWGMisbuilt.Thelightofmicro-nanofiberentersmicrospherebyevanescentfieldcoupling.Discusstheeffectsofthecharacteristicsofbothmi

7、cro-nanofiberentersmicrosphere,suchasradiusandrefractiveindex.TheimpactofdifferentparametersontheexcitationofmicrosphereWGMisstudied.Therefractiveindexonthesurfaceofmicrosphereschangedleadtothedistributionofmodefieldchange.Andtheresonancepeakwavelengthdriftisdue

8、tothechangeofthemodefieldofmicrosphere.ThesensingcharacteristicsoftherefractiveindexonthesurfaceofmicrospheresaresimulatedbyMatlab.Finally,therelationsbetweentheWGMre