Multi-functional vanadium dioxide integrated metamaterial for terahertz wave manipulation

We proposed a vanadium dioxide (VO₂)-integrated multi-functional metamaterial structure that consists of three metallic grating layers and two VO₂ films separated by SiO₂ dielectric spacers. The proposed structure can be flexibly switched among three states by adjusting temperature, incident direction, and polarization. In state 1, the incident wave is strongly transmitted and perfectly converted to its orthogonal polarization state. In state 2, the incident wave is perfectly absorbed. In state 3, incident wave is totally reflected back. The working frequency of the multi-functional metamaterial can be arbitrarily tuned within a broad pass band. We believe that our findings are beneficial in designing temperature-controlled metadevices.