▎ 摘　　要

In this paper, we present an asymmetric rectangular ring resonator based on graphene nanoribbon. The finite-difference time-domain method for three-dimensional model is used to investigate the multiple Fano resonances which can be observed in the transmission spectrum. We also study the influence of graphene structure parameters and chemical potential on Fano resonance. Furthermore, we explore the application of this structure in refractive index sensing. The sensitivity to background refractive index can reach 16494 nm/RIU. This high sensitivity makes the structure a promising biosensor.