Using tunable inter-resonator coupling to reshape the mid-infrared absorption spectrum of graphene-based metamaterials

Abstract

We explore the use of tunable inter-resonator coupling to reshape the spectral absorptivity of a graphene-based metamaterial. The metamaterial comprises of a periodic array of coupled metal-insulator-metal resonators, with two resonators per unit cell. One resonator supports a bright mode, and the other a dark mode. We use coupled-mode theory to show that, by tuning the resonant wavelength of the bright mode through the dark mode, the spectrum can be reconfigured from a single-peak shape to a split-peak shape. We then propose specific, realistic device geometries to allow realization of this concept.