Tunable plasmon-induced transparency in graphene metamaterials with ring-semiring pair coupling structures.

In this paper, a tunable graphene metamaterial with a ring-semiring pair coupling structure was proposed to achieve the plasmon-induced transparency (PIT) effect at terahertz frequencies, and its high-sensitivity sensor performances were simulated. We change the resonant frequency of the PIT window by adjusting the Fermi energy of the graphene or the relative distance of the geometry parameters. When the refractive index of the dielectric inserted into the structure changes, the spectral transmission of the metamaterial structure changes simultaneously. Therefore, the results of this study provide a new, to the best of our knowledge, method for making adjustable light sensors.