# Plain silicon grating reveals a hidden 'twist' in light from electron beams

- Source: Phys.org
- Published: 2026-10-23T20:20:08+00:00
- Category: Science
- Original: https://phys.org/news/2026-10-plain-silicon-reveals-hidden-electron.html
- Canonical: https://groundlevelnews.com/story/plain-silicon-grating-reveals-a-hidden-twist-in-light-from-electron-be-465812/

In 1953, two physicists showed that an electron beam skimming past a grating emits light whose color depends only on the electron's speed and the grating's spacing. Known as Smith-Purcell radiation, this phenomenon has become a useful tool for building compact, tunable light sources and tracking particle beams without touching them.

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