Abstract
We design a D-shaped fiber optic biosensor based on the surface plasmon resonance (SPR) of a
metalgraphene layer and simulate this SPR using the finite element method. Using a metal-graphene layer as the
sensing material, surface plasma resonance is simulated as the refractive index of the external environment
ranges from 1.33 to 1.36. Simulation results show that a metal-graphene layer attached to the D-shaped optical
fiber core can couple with light under a specific polarization state and excite strong plasma oscillations on
the layer surface. Calculated transmission coefficients show that the resonance wavelength obviously moves
toward longer wavelengths as the refractive index of the test medium increases, and a sensitivity of 5400
nm/RIU is obtained. Because of its large surface volume ratio and good biocompatibility, graphene may be
utilized in many applications in the field of biosensing.
© 2013 Chinese Optics Letters
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