Transmittion and slow-light analysis based on tunable plasmon-induced transparency in patterned monolayer graphene metamaterial and its sensing application

Abstract

A novel design of monolayer graphene metamaterial is proposed and numerically investigated to achieve tunable plasmon-induced transparency (PIT) and switcher in THz region. The designed top graphene layer includes the resonators of strips and annulus and deposit on the indium antimonide. A distinct PIT transparency window originating from the bright-bright mode coupling is examined based on the analysis of electric field distribution. Highly tunable optical response can be realized not only by the Fermi energy, but also the incident polarization angle and the external thermal stimuli. What’s worth noting is that the resonant width and strength of PIT transparency window can be flexibly tuned at a fixed frequency. In addition, the accompanied slow light effect around the transparency window and a single or dual frequency switchable on-to-off modulator are also realized by setting the Fermi energy. Finally, the sensing application is demonstrated through the thermal stimuli and the sensitivity is about 9.5 GHz/K. Therefore, our results provide guidance for the design of highly flexible and tunable terahertz photonic devices.