D-shaped fiber optic SPR biosensors based on a metal-graphene structure-中国期刊网

摘要 WedesignaD-shapedfiberopticbiosensorbasedonthesurfaceplasmonresonance(SPR)ofametal-graphenelayerandsimulatethisSPRusingthefiniteelementmethod.Usingametal-graphenelayerasthesensingmaterial,surfaceplasmaresonanceissimulatedastherefractiveindexoftheexternalenvironmentrangesfrom1.33to1.36.Simulationresultsshowthatametal-graphenelayerattachedtotheD-shapedopticalfibercorecancouplewithlightunderaspecificpolarizationstateandexcitestrongplasmaoscillationsonthelayersurface.Calculatedtransmissioncoefficientsshowthattheresonancewavelengthobviouslymovestowardlongerwavelengthsastherefractiveindexofthetestmediumincreases,andasensitivityof5400nm/RIUisobtained.Becauseofitslargesurfacevolumeratioandgoodbiocompatibility,graphenemaybeutilizedinmanyapplicationsinthefieldofbiosensing.

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D-shaped fiber optic SPR biosensors based on a metal-graphene structure

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D-shaped fiber optic SPR biosensors based on a metal-graphene structure

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