Using Dispersion HIE-FDTD Method to Simulate the Graphene-Based Polarizer

A dispersion hybrid implicit-explicit-finite-difference time-domain (HIE-FDTD) method is used to simulate a graphene-based polarizer in this paper. The surface conductivity of graphene is incorporated into the conventional HIE-FDTD method directly through an auxiliary difference equation (ADE). The time step size in the proposed method has no relation with the fine spatial cells in the graphene layer. The simulation results show that the calculated result of the dispersion HIE-FDTD method agrees very well with that of the conventional ADE-FDTD method, but its computational time is considerably reduced. By using the dispersion HIE-FDTD method, it numerically validates that graphene can be used as a tunable linear-to-circular polarizer through controlling its chemical potential.