Active Control of Near-Field Coupling in a Terahertz Metal-Graphene Metamaterial

摘要

We demonstrate an active control of near-field coupling between dark and bright eigenmodes in terahertz metamaterials. The metamaterial unit cell consists of two orthogonally twisted split-ring resonators, which are tightly coupled with each other through near field. The monolayer graphene is integrated into the unit cell and the coupling strength of the near field can be actively modulated by the manipulation of graphene conductivity via shifting its Fermi level. This letter presents a unique route toward the realization of ultrafast and active controlled near-field coupled metamaterial devices.