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A Graphene-Based Tunable THz Metamaterial Absorber

A graphene-based tunable THz metamaterial absorber is presented in this paper. The proposed absorber is a periodical structure with the unit cell composed of four square gold patches on single-layered graphene, which are placed on a dielectric spacer supported by a gold bottom layer. Simulation results indicate that the absorption frequency can be tuned by varying the chemical potential of graphene through controlling of the electrostatic gating or the geometry size of the gold patch. By introducing more gold patches with different size into the unit cell, we can obviously extend the absorption bandwidth to achieve a broadband absorber.