Dynamic PB metasurface for transmissive and reflective wavefront manipulation

Abstract Based on the phase transition characteristics of vanadium dioxide (changes in conductivity with temperature), we designed a dynamic metasurface for wavefront manipulation that can switch between transmission and reflection modes at the same frequency. When vanadium dioxide is in the metallic state, the metasurface operates in reflection mode, while it is in the insulating state, it works in transmission mode. The phase distributions of the two operating modes are different and can be easily adjusted by rotating the inner and outer rings. At the frequency of 1.3 THz, we designed a metasurface that can switch between anomalous reflection and refraction with different deflection angles. Additionally, we created a switchable metalens that provides different focal lengths in reflection and transmission modes. The tunable metasurface can provide innovative design possibilities for dynamical wavefront manipulation.