Surface plasmons on a doped graphene sheet with periodically modulated conductivity

• A simple periodic configuration for the excitation of surface plasmons polaritons (SPP) on a doped graphene sheet is presented.
• A model taking into account the periodic spatial modulation of the graphene conductivity is proposed.
• It is found that rather high absorption can be achieved with the presented structure.

We propose a model taking into account the periodic spatial modulation of a doped graphene sheet conductivity when it is placed in the vicinity of a dielectric grating. We then compute the absorption and study the excitation of surface plasmons on such a structure. We show that it is possible to excite surface modes leading to very high absorption. Our findings could be of interest in the design of graphene-based plasmonic devices and sensors working in the infra-red and the terahertz regions of the electromagnetic spectrum.