Consistent analysis and rigorous characterization of infinite graphene layers via a subcell frequency-dependent FDTD technique

An efficient finite-difference time-domain methodology combined with a robust subcell formulation for the precise analysis of infinite graphene sheets is introduced in this paper. The graphene surface conductivity is modeled through a volume conductivity profile, with the pertinent periodic boundary conditions applied to the unit cell's lateral surfaces. Moreover, a set of linearly-polarized normally-incident wideband pulses excites the computational domain, while the graphene's dispersive nature is described by an auxiliary differential equation concept. The novel algorithm is validated via several configurations and a demanding optical visibility problem, whose numerical results, compared to those of closed-form expressions, are proven very satisfactory.