Switchable Multifunctional Metasurfaces Based on Vanadium Dioxide in the Terahertz Region

Terahertz metasurfaces attract more and more attention in the recent years due to their unique properties and promising application prospects. Here we propose an active multi-functional metasurface at terahertz frequencies, whose functionalities can switch between the highly efficient absorption and broadband polarization conversion by changing the ambient temperature, based on the phase-transition effect of vanadium dioxide (VO2). The designed metasurface is polarization independent, and the simple design is easy to fabricate in experiment, which is expected to enrich the terahertz modulators and functional devices.