Optics and Photonics Society of Iran

In this paper, a bistable structure is proposed based on a single graphene layer, two one-dimensional photonic crystals and two defect layers. Our results show that this structure can act as a bistable device in the terahertz regime. The dependence of bistability threshold on the number of unit cells in the photonic crystal is studied. By increasing the number of cells, both switch-down and switch-up thresholds first decrease and then increase. Then we show that the value of switch-up threshold significantly increases with increasing incident angle. Finally, it is demonstrated that both switch-up and switch-down thresholds decrease with decrease of Fermi energy of graphene layer. Therefore, the bistability threshold in this structure is easily controllable.