Tunable terahertz multi-functional hybrid-patterned metasurface arrays based on vanadium dioxide

Abstract

This study investigates a nine-layer multi-functional periodic array with active broadband tuning in the terahertz (THz) band. The device comprises symmetrical vanadium dioxide (VO2) films and polypropylene (PP) layers, along with silicon dioxide (SiO2) layers, hybrid-patterned metasurfaces, and a central VO2 layer. Through detailed analyses of the electric field distribution, equivalent circuit, and effective impedance, we have performed a thorough investigation of the resonance modes present in the device and meticulously optimized various parameters. Leveraging the insulator-to-metal transition of VO2, a remarkable device capable of seamlessly switching between extraordinary terahertz transmission and bi-directional perfect absorption was obtained. These characters exhibit limited susceptibility to incident angle of the incoming wave. By incorporating bow-tie apertures within the “vacuum region” of the hybrid-patterned metasurfaces, a significant improvement in field enhancement has been achieved, all while effectively eliminating any adverse effects on transmission and absorption performance. This device presents a novel and effective approach in the development of adjustable and multifunctional THz metasurface devices.