HIE-FDTD method for simulating tunable terahertz graphene absorber

In this paper, the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is proposed for efficient simulation of graphene-based absorbers at THz; there the graphene model is incorporated into the numerical methods with auxiliary differential equation (ADE) technique for solving the Maxwell´s equations. Numerical simulations show that the absorption peaks of the absorbers can be tuned effectively by varying the chemical potential or layer number of the few-layered graphene sheets.