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This paper proposes a D-type optical fiber local surface plasmon resonance biosensor based on graphene-gold nanowires-graphene sensitization. In this paper, the modal characteristics of three sensor models are analyzed by the full vector finite element method (FEM). Their simulation results are compared, which shows that the sensitivity of the sensor designed in this paper is better than that of the other two models. When the external refractive index is 1.33-1.40, the maximum sensitivity of the sensor designed is 7383.79 nm/RIU. The average sensitivity is 4136 nm/RIU.
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