Extremely fast tiny light source switching between electrically neutral and charged luminescent particles in 2D material

https://phys.org/news/2024-09-team-succeeds-ultra-fast-tiny.html

"cryogenic 2D molybdenum diselenide short laser pulsed generating excitons, then trions, then material THz pulsed quickly tuning trions back into excitons, and cycle repeated... bond broken within few ps, rapid switching, almost 1,000x faster... even comparatively low intensity can trigger... extremely compact: optical data processing, flexible THz cameras/ detectors featuring numerous pixels"