Terahertz wave scattering by a graphene disk

The excitation of surface-plasmon resonances on a graphene disk is studied numerically as a full-wave 3D electromagnetic scattering problem. The mathematical model for the scattering of a horizontal magnetic dipole field by a graphene disk is based on Maxwell´s equations with electrically-resistive boundary conditions on the disk surface, where the graphene electron conductivity is included as a parameter and determined from the Kubo formalism. It is shown that plasmon resonance frequencies in the terahertz range shift with variation of the chemical magnetic potential of the graphene.