A Free-Standing Mono-Layer Graphene Metamaterial Sheet as a Tunable Terahertz Absorber

A tunable terahertz absorber using free standing graphene metamaterial sheet is proposed and simulated. The absorber is made of electric LC resonators periodically placed in free space. It is shown that absorption of 50% is achieved in one or two frequency bands, depending on the polarization of the incident wave. The structure s performance with varying graphene s chemical potential is investigated. It is shown that with varying chemical potential, frequency of absorption is changed and a tunable absorber is resulted.