Dynamic modulation of electromagnetically induced transparency in complementary graphene metamaterial

In this paper, we use a complementary graphene metamaterial to achieve dynamic modulation of electromagnetically induced transparency. The structure consists of a disk slot graphene and a strip slot graphene corresponding to bright and dark modes, respectively. A clear transparency window appears in the transmission spectrum. In contrast to metallic metamaterials, the transmission spectrum of the complementary graphene metamaterial can be controlled by changing the Fermi energy rather than reconstructing the structure. The complementary graphene metamaterial proposed in this paper modulates the gate voltage more simply than discrete structures of a graphene metamaterial. Active control of the slow-light effect can also be realized by modulating the Fermi energy. This work demonstrates potential applications in the design of terahertz modulators, environmental sensors, and slow-light devices.