Dynamically-Tunable Terahertz Band-Stop Filter Based on Multilayer Graphene Metamaterial

Abstract

In this paper, a dynamically-tunable band-stop filter based on periodically patterned graphene nanostrip and nanodisk in THz wavelength is proposed and numerically investigated at room temperature. The properties of proposed structure are calculated by using the finite-difference time-domain method. The patterned graphenes are excited by the incident light which leads to absorb two different ranges of spectral wavelength. The simulated results show that a wide free spectral range can be achieved by using multilayer graphene. More importantly, it is found that the transmission dips can be dynamically controlled by adjusting the gate voltage. Moreover, the transmission dips change with graphene mobility which corresponds to graphene intrinsic loss. Finally, the proposed metamaterial structure may be used for many applications such as tunable sensors, active plasmonic switches, and slow light devices.