Dynamically tunable implementation of electromagnetically induced transparency based on bright and dark modes coupling graphene-nanostrips

In this paper, we numerically demonstrated a dynamically tunable implementation of electromagnetically induced transparency (EIT) based on bright and dark modes coupling graphene-nanostrips. Two graphene-nanostrips are connected respectively with two metallic pads, which make Fermi energies of proposed two graphene-nanostrips can be independently tuned by changing bias voltage between the metallic pads and substrate, and the EIT window can be easily controlled than metallic and separated graphene structures. As a result, the EIT window has a significant tunable capacity, and the most remarkable characteristic of proposed structure is to achieve distinct transparency windows respectively at two perpendicular directions of polarization, which is not obtained or analyzed in the previous similar structures, and these merits exhibit the potential applications in sensor device.