Tunable filter based on hybrid metal-graphene structures over an ultrawide terahertz band using an improved Wave Concept Iterative Process method

Abstract

An improved Wave Concept Iterative Process method is used to simulate a tunable filter based on hybrid metal-graphene over an ultrawide terahertz band. To accurately model the graphene, both the interband and intraband conductivities are incorporated into the WCIP method by using the wave concept and the boundary conditions at the graphene sheet. The WCIP method reduces the time consumption and memory size since it was applied to the surface conductivity graphene directly without involving volumetric discretization. Simulation results show that the transmission and reflection coefficients of the proposed filter can be adequately adjusted by changing the chemical potential of graphene, and operating temperature. It also shows that the interband conductivity has an important effect on the performance of the graphene device, especially at the frequency band larger than 8 THz.