Enhanced optical pump-terahertz probe nonlinearity enabled by nanoresonators on vanadium dioxide thin film

We demonstrate that nanoresonators on a VO
2
thin film help amplify the available optical pump-terahertz probe transmission nonlinearity. With subpicosecond time scale of VO
2
phase transition, dramatically enhanced ultrafast control of THz transmission is enabled by moderate optical pump while no switching dynamics is observed for bare VO
2
films.