High efficient coupling of graphene surface plasmons to far field radiation is possible by
some techniques and can be used in the radiating applications. Besides of the coupling
efficiency, the angular distribution of the radiated power is an important parameter in the
radiating devices performance. In this paper we investigate the gain of the far field radiation
related to the coupling of graphene surface plasmons via a high permittivity medium located
close to the graphene. Our results show that high directive radiation and high coupling …