Tech
Silicon Air Holes Turn Wafers Into Flat Ultraviolet Mirrors
Researchers at the University of Stuttgart have engineered a flat optical metasurface that reflects and focuses ultraviolet light by trapping it inside nanoscale cavities. The device, detailed in [Advanced Photonics via Phys.org](https://phys.org/news/2026-11-air-holes-silicon-wafers-flat.html), uses microscopic air holes etched directly into standard silicon wafers to bypass the heavy absorption that usually limits silicon in ultraviolet optics. This optical invention provides a flat alternative to bulky curved mirrors for high-resolution imaging and chemical sensing.
