Active Modulation of EIT-like Response with a Metal-graphene Hybrid Metasurface in Microwave Regime

Abstract

Tunable metamaterial analogues of electromagnetically induced transparency (EIT) have been extensively studied and widely achieved by applying electrically adjustable elements. In this work, we propose an EIT metasurface consisting of graphene and metal-based configurations composed of cut wires (bright mode resonator) and split-ring resonators (dark mode resonator). The modulation mechanism of the hybrid metamaterial is that we can control the damping factor of the dark mode resonance by manipulating the Fermi level of graphene placed below the dark mode resonator, having a direct effect on the resonance amplitude of the EIT metasurface. The amplitude modulation from this hybrid metamaterial offers a fresh design strategy of EIT analogue in the microwave regime.