Tunable electromagnetically induced transparency in graphene metamaterial in two perpendicular polarization directions

In this paper, a novel structure with coupling hybrid graphene metamaterial, which can achieve a tunable EIT (electromagnetically induced transparency)-like effect in two perpendicular polarization directions is proposed. The structure is comprised of a vertical graphene strip and a pair of H-shape graphene strips, and the H-shape strips are placed alternately on both sides of vertical graphene strip. The EIT-like effects of the proposed structure are simulated and demonstrated using finite-difference time-domain method. The simulation results show that the proposed analogue can achieve dynamically tunable EIT-like effects not by re-fabricating the size of structure but by changing the Fermi level of graphene, furthermore, the above EIT-like effects can be realized in two perpendicular polarization directions. In addition, the mechanism of EIT-like effects and the impact of relaxation time on transparency windows are also demonstrated and analyzed. This work demonstrates a novel EIT-like phenomenon based on metamaterial and opens a new perspective in EIT effect applications.