Abstract

This paper introduces a novel metamaterial switchable terahertz (THz) reflector/absorber, which incorporates a composite graphene and vanadium dioxide (${{\rm VO}_2}$) structure. The structure comprises gold and graphene layers separated by ${{\rm VO}_2}$ dielectric layers. By leveraging the electrical adjustability of graphene and the temperature adjustability of ${{\rm VO}_2}$, the operating frequency and absorption amplitude of the absorption spectrum can be controlled by adjusting the Fermi levels of graphene and the conductivity of ${{\rm VO}_2}$. The designed dual-function switch can be utilized as a reflector when ${{\rm VO}_2}$ exhibits a metallic state and as a perfect multiband absorber when ${{\rm VO}_2}$ exhibits dielectric properties. Numerical simulation results demonstrate that the proposed device exhibits exceptional performance for TE and TM waves, achieving a more than 99% absorption rate at 2.2, 6.5, and 10.5 THz. This structure holds considerable potential for a wide range of applications, including temperature monitoring, stealth technology, wireless communication, and biomedicine.

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