Plasmon-Induced Transparency-Based Dual-Polarization Multifunctional Graphene Metamaterial

This study introduces a plasmon-induced transparency (PIT)-based dual-polarization multifunctional graphene metamaterial operating in the lower terahertz frequency range. It consists of upper down and left-right rings arranged on the silica surface. The finite-element method is employed for numerical calculations, with simulation results illustrating that the proposed metamaterial displays a single PIT window for both x- and y-polarizations. The switch functionality is achieved by tuning the graphene’s Fermi energy level, corresponding to the maximum modulation degree of amplitude attaining 98.9%. As a sensor, the graphene metamaterial exhibits a maximum sensitivity of 208.6 GHz/refractive index unit (RIU), and as a slow-light device, it possesses a maximum group delay of 8.22 ps. Consequently, dual-polarization metamaterial proves to be the standout candidate in the simultaneous implementation of sensing, switching, signal processing, and optical communication.