光纤光栅折射率传感理论与实验研究

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1、东南大学博士学位论文光纤光栅折射率传感理论与实验研究姓名：陈娜申请学位级别：博士专业：物理电子学指导教师：崔一平20070901东南大学博士论文ABSTRACTFibergrating，asanall-fiberphotoniccomponentwithperiodicalparametermodulation,hasbeendevelopedtobeanindispensableessentialcomponentinsuchareasasfibersensingandfibercommunicationsinceitWasfL

2、rstlyin仃oducedthinyyearsago．Temperature，strainandambientrefractiveindexarethreebasicparametersthatcanbesensedbyfibergratingsffllsordirectly．TemperatureandstrainsensingwerewelldevelopedintraditionalfibergratingSgIISOrS．However,thetechnologyofambientrefractiveindexsensi

3、ngdrawslessattentionthantheothertwotechnologiessincefewerdemandsinthepast．Asaresult，itisalsonotasmatureastheothertwo．Inrecentyears，withtherapiddevelopmentofbiotechnologyandthefastgrowingrequirementsinenvironmentmonitoringandecologicalprotection,thefunctionofambientref

4、ractiveindexsensingoffibergratingindexsensorstarttowinmorepublicattentions．Fibergratingindexsffllsorshouldhaveenoughspacetogrowamongabovenewapplicationareasinthefuture,sinceithasmanyspecialadvantagesOVertraditionalsgngor．TMsdissertationaddressesthreetypesofnewfibergra

5、tingindexsensorsforbiochemicalsensing．TheyareetchedfiberBragggrating(FBG)claddingmoderesonancerefractiveindexsensor,claddingindexmodulatedfibergratingrefractiveindexsonsorandsubwavelength-diameterfibergratingrefractiveindexsensor．1五ecarefultheoreticalworkswereperforme

6、dinthisdissertationforsuchthreetypesofSelLsOI'Sbasedonfibermodalanalysisandcouplingmodetheory．Theirspectrumcharacteristicsandsensingperformancewereobtained．neFBGcladdingmoderesonanceambientrefractiveindexsensorWasfirstfabricatedinourlaboratoryandahighsensitivityof172n

7、m／riuisobtainedinthesensingexperiment，whichprovedthetheoreticalperformance．Additionally,basedonthissensoraliquid-levelsensingproposalispresanmd．Andboththereoticalandexperimentalworksaredonesubsequently．Thosethreetypesofnewfibergratingindexsensorshavethefeaturesoflowin

8、sertloss，lowcost，highsensitivity,andwidedynamicrangeofambientindex．Theyaresuitableforbiochemicalsensing，environmentmonitorin