Simulation Studying for a THz Modulator with Resonance Cavity Coupled to Graphene-loaded Metal Wire Grating

Terahertz imaging technology has been widely used in biomedical imaging. The traditional Raster-scanned THz imaging systems are naturally slow because of the imaging mechanism. Most available THz imaging systems can speed up the imaging speed but require expensive detector array. The compressive sensing imaging technology has realized high speed imaging to solve above problems with only a single-pixel detector, which require a spatial light modulator to coding the image signal. We report a high-performance terahertz modulator design by exploiting Fabry-Perot cavity coupled to graphene-loaded metal wire grating. In this paper, the finite element simulation software (Comsol) is used to simulate the device performance, and the theoretical formula is derived to calculate the reflectivity of the device model.