Advances in Meta-Optical Technologies for Ultrafast Light Control and Future Applications

The article reports an experimental demonstration of ultrafast optical control of resonances in symmetry-broken metasurfaces by tuning the radiative loss parameter γrad through selective optical pumping, leveraging restored symmetry-protected bound states in the continuum (RSP-BICs) to achieve dynamic on-off switching of high-Q resonances on subpicosecond timescales, with potential applications in active nanophotonics and ultrafast optical devices.