Laser controls ultra-fast liquid switch for terahertz radiation

https://phys.org/news/2022-12-laser-ultra-fast-liquid-terahertz.html

"converts water into conductive state within less than a trillionth of a second during which time it behaves almost like a metal... fastest known switching speed of a semiconductor... like squeezing a gardening hose to make the jet of water broad and flat, only on a much smaller scale... short yet powerful laser pulse is then directed through this water jet. The laser frees electrons from the salt dissolved in the water so that the water becomes suddenly conductive at terahertz frequencies"