Optical bistability modulation based on the photonic crystal Fabry–Perot cavity with graphene

Abstract

We investigate the low-threshold optical bistability of transmitted beams at the terahertz range based on the photonic crystal Fabry–Perot cavity with graphene. Graphene with strong nonlinear conductivity is placed in the middle of the Fabry–Perot cavity and the resonance of the cavity plays a positive role in promoting the low-threshold optical bistability. The optical bistability curve is closely related to the incident angle of light, the parameters of graphene, and the structural parameters of the Fabry–Perot cavity. Through parameter optimization, optical bistability with threshold of 105 V/m can be obtained, which has reached or is close to the range of the weak field.