Dynamically selective control of dual-mode electromagnetically induced transparency in terahertz metal-graphene metamaterial

Abstract

Here, we design a metal-graphene metamaterial to selectively control dual EIT modes. The metallic metamaterial consists of bright, dark, and quasi-dark meta-atoms, leading to two EIT modes. Meanwhile, monolayer graphene ribbons inserted under the dark meta-atoms and quasi-dark meta-atoms are separately connected to different electric sources. In simulation, both the two EIT modes and the time delays can be selectively controlled. Moreover, the number of the EIT modes can be tuned from two to one, and even to zero. Our work provides a strategy to selectively control the two EIT modes and the slow light compacted in a terahertz metamaterial, which may achieve potential applications in actively tunable integrated terahertz devices.