▎ 摘　　要

A graphene-based surface plasmon resonance sensor using D-shaped fiber in anti-crossing has been designed. Silver as a plasmon active metal is followed by graphene, which helps in preventing oxidation and shows better adsorption efficiency to biomolecules. A wavelength interrogation technique based on the finite element method has been used to evaluate performance parameters. Design parameters such as thickness of silver, residual cladding, and GeO2 dopant concentration have been optimized. The wavelength sensitivity is found to be 6800 nm/RIU and resolution of 8.05 x 10(-5) RIU. We believe that usage of graphene on silver may open a new window for study of online biomolecular interaction. (C) 2017 Optical Society of America