Excitation of SPPs in graphene by a waveguide mode

Abstract

We present a semi-analytical model that predicts the excitation of surface-plasmon polaritons (SPPs) on a graphene sheet located in front of a sub-wavelength slit drilled in a thick metal screen. We identify the signature of the SPP in the transmission, reflection, and absorption curves. Following the previous literature on noble-metal plasmonics, we characterize the efficiency of excitation of SPPs in graphene computing a spatial probability density. This quantity shows the presence of plasmonics resonances dispersing with the Fermi energy, EF, as an unambiguous signature of graphene plasmons.