Multi-parameter tunable terahertz absorber based on graphene and vanadium dioxide

Abstract

This article is based on graphene and vanadium dioxide (VO2) to build a THz metamaterial absorber that can be exchanged in three modes: single-band, dual-band, and broadband. The change of the frequency band can be accomplished by changing the Fermi level of graphene and the state of VO2. When VO2 is in a metallike state, diverse single-band absorbers can be gotten, and after that, a dual-band absorber can be gotten by controlling the movement of VO2 from a metallike state to an insulation state. When VO2 is in a metallic state, the mutual coupling between graphene and VO2 expands the absorption bandwidth and realizes broadband absorption. Also, the broadband collector is not insensitive to the polarization point and occurrence point of TE polarization and TM polarization. Compared with the existing absorber, the absorber based on graphene and VO2 we outlined not only has a higher bandwidth but for most critically, can accomplish higher integration, compatibility, and a more adaptable adjustable range.