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空芯光子晶体光纤与单模光纤耦合优化及在拉曼气体检测中的应用（英文）.docx

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空芯光子晶体光纤与单模光纤耦合优化及在拉曼气体检测中的应用（英文） OptimizationofCouplingbetweenHollow-corePhotonicCrystalFiberandSingle-modeFiberandItsApplicationinRamanGasSensing Abstract: Hollow-corephotoniccrystalfiber(HC-PCF)hasshowngreatpotentialingassensingduetoitsuniquepropertiessuchaslowattenuation,largeeffectivemodearea,andstronglight-gasinteraction.However,couplinglightintoHC-PCFfromconventionalsingle-modefibers(SMFs)isstillachallengeduetothelargemodemismatchandhighloss.ThispaperpresentsanoptimizationmethodforHC-PCF-SMFcouplingbyadjustingthedistanceandangleofthefibers.Inaddition,theHC-PCFisappliedinRamangassensing,whichcandetectgasconcentrationwithhighaccuracyandsensitivity. Introduction: Gassensingplaysacriticalroleinenvironmentalmonitoring,industrialprocesscontrol,andpublicsafety.Ramanspectroscopybasedonlaserexcitationhasbecomeapromisingtechniqueforgasdetectionduetoitshighsensitivity,selectivity,andreliability.However,thelowRamanscatteringcross-sectionandabsorptionofgasesrequirelonginteractionlengthandstronglaserpower.Thisraisesthedemandforopticalfiberstoguidethelaserlightandgassignal. HC-PCF,asanewtypeofopticalfiber,containsanarrayofairholesalongthelongitudinaldirection,whichformsaphotonicbandgapthatpreventslightfrompropagatinginthecladdingandconfinesitinthehollowcore.TheabsenceofmaterialinthecoreenablesHC-PCFtoavoidtheabsorptionanddispersioncausedbygasmolecules,resultinginahightransmissionefficiencyandsensitivityforgassensing.However,therearestillchallengesinHC-PCF-SMFcoupling,whichlimitedthepracticalapplicationofHC-PCFingassensing. Couplingoptimization: ToimprovethecouplingefficiencybetweenHC-PCFandSMF,thedistanceandanglebetweenthefibersshouldbeoptimized.Thedistanceoptimizationisbasedonthemodefielddiameter(MFD)matching.TheMFDisthediameteroftheregioninwhichtheopticalfieldamplitudedecreasesto1/eofitsmaximumvalue,whichcharacterizestheeffectivemodeareaandpowerconfinementofthefiber.TheMFDofSMFisusuallysmallerthanthatofHC-PCF,whichleadstoalargemodemismatchandcouplingloss.Tominimizethecoup