  The VO2-based THz metasurface optical switching threshold is reduced by more
than five orders of magnitude to 0.32-0.4 W/cm2 due to the supply of a
subthreshold electric current. Moreover, additional deposition of Au
nanoparticles can further reduce the threshold by 30% due to plasmonic effects.
The proposed designs and a combined approach to controlling the sub-THz/THz
transmission by electric current and light make it possible to overcome the
existing bottleneck in design of dynamically programmable THz mirror array
based on metasurfaces.
