Finite-difference time-domain modeling of monolayer graphene devices at near-infrared wavelengths

A finite-difference time-domain (FDTD) discretization of the dispersive conductivity of monolayer graphene has been done at the wavelength of 1.55 μm, the third telecommunication window. The FDTD discretization is used to simulate a monolayer graphene plasmonic waveguide and a graphene surface plasmon polariton add–drop filter. We utilize the auxiliary equation method to solve Maxwell’s equations in time-domain and simulate monolayer graphene-based devices without using the subcell method. The results show that the implementation of this method is surprisingly consistent with the results of the previous works and theoretical method. Our proposed method does not suffer from the deficiencies of the subcell and surface boundary condition methods. Both the interband and the intraband terms of the graphene conductivity are used to implement the graphene simulation. Our proposed method is useful for the analysis of monolayer graphene devices at near-infrared wavelengths with less computational complexity.