A 0.67 THz Tunable Meta-surface Filter by Phase Change Medium

Abstract

A polarization-independent tunable filter with initial band-rejection frequency centered at 0.67 THz is proposed by integrating the phase transition medium with meta-surface hierarchy. The device employs the composite meta-elements of closed ring resonators (CRR) and the cross-shaped electric resonators to couple with one layer of phase change medium on Rogers. The computational results reveal that the tunable frequency shifts from 670 GHz to 489 GHz can be obtained, with the initial resonant qualify factor Q of 8.27 and the -3 dB bandwidth of 81 GHz. As a result, the amorphous and crystalline state before and after phase change directly constitute a switchable or tunable filter with contrast ratio of 1227:1.