Tunable Graphene Split-Ring Resonators

Graphene is a tunable plasmonic material, and the resonance of graphene split-ring resonators (SRRs) is predicted to induce very strong field confinement. Recent years have seen many studies of graphene-based SRRs with analytical calculations and numerical simulations, yet without experimental demonstration, due to practical challenges in sample preparation and measurement. This is where the authors have succeeded, by producing tunable, ultracompact SRR arrays based on graphene. Their work experimentally bridges the gap between graphene and magnetic metasurfaces in the terahertz regime, making significant progress toward multifunctional graphene-based metasurfaces.