Tunable terahertz electromagnetically induced transparency based on a complementary graphene metamaterial

We proposed a dynamically tunable electromagnetically induced transparency (EIT) in the terahertz region based on a complementary graphene metamaterials within two asymmetric slot structures. A transparency peak is enabled through the coupling between the asymmetric slot-structure elements when their symmetry is broken. The width of transparency window can be controlled by varying the asymmetry degree. Moreover, by varying the Fermi energy of graphene, the transmission peak can be dynamically tuned, realizing a blue-shift without re-optimizing or re-fabricating the nanostructure. Therefore, the work opens up opportunities for the development of tunable compact elements such as slow light devices, sensors and switches.