Dual‐band reconfigurable coding metasurfaces hybridized with vanadium dioxide for wavefront manipulation at terahertz frequencies

Abstract

AbstractIn this article, we propose a frequency reconfigurable reflective coding metasurface hybridized with vanadium dioxide (VO2) meta‐atoms for wavefront manipulation at terahertz (THz) frequencies using the Pancharatnam‐Berry (PB) phase principle. At room temperature, the meta‐atoms can achieve a nearly constant 180° reflection phase difference illuminated by linearly x‐ and y‐polarized waves while maintaining almost consistent reflection amplitude within 3.76 to 3.84 THz, corresponding to the conductivity of . Once the temperature is increased and VO2 is in a fully metallic state with the conductivity of , the meta‐atoms operate at 1.18 to 1.47 THz. Flexible controls of scattering patterns of the PB coding metasurface can be realized utilizing the meta‐atoms. Numerical simulations demonstrate that the designed VO2‐based metasurface can generate multibeams as expected. This work opens a pathway in designing frequency reconfigurable coding metasurface to generate multibeams in THz, which holds great potential in new concept antennas for future wireless communication systems.