Metasurface plus asymmetrical semiconductor layer featuring quantum wells converts light into new frequencies 72,000X more efficiently

https://phys.org/news/2026-09-nanostructure-linear-conversion-efficient.html

"metasurface redirects light along nm-scale quantum wells (spatially restricting electron movement), forming atom-like states... tilting device 0.3° generates extremely strong telecommunication wavelength non-linear light polarization... compact, low-energy platform shrinks components... leap in non-linear optical efficiency: optical signal processing, nanophotonics, quantum light generation, quantum computing, high-speed data communication"