Tunable plasmon-induced transparentcy in bilayer graphene metamaterials

Abstract

The tunable plasmon-induced transparency (PIT) metamaterial structures composed of periodically patterned graphene microholes and microribbons are presented and numerically investigated. The interaction between plasmonic modes that lead to the PIT effect is studied in detail by analyzing the field distributions. A coupled Lorentz oscillator model is used to explain the mechanism of the PIT effect. The transparency window of PIT structures can be dynamically tuned by varying the Fermi level of the graphene. The tunable graphene PIT device may have potential applications in designing optical switching devices, ultra-compact sensors and slow light devices in the THz region.