Switchable absorbing, reflecting, and transmitting metasurface by employing vanadium dioxide on the same frequency

In this work, we proposed a switchable metasurface based on phase transmission material of vanadium dioxide (VO₂) with metal and insulation mode. Simulation results demonstrated that the metasurface can switch perfectly at frequencies of 1.89 THz and 2.67 THz from two perfect absorbing peaks to a reflecting peak and a transmitting peak. When VO₂ serves as metal mode, there were two absorption peaks of 99.93% and 99.92% respectively. When VO₂ serves as insulation mode, the reflection and transmission magnitudes were 92.50% and 90.50% respectively. Simultaneously, the structure was insensitive to the incident angle from the simulation result. The proposed metasurface could therefore provide potential application prospects for the terahertz band switcher or sensor.