What happens when you try to chop a photon in half?
A mirror that moves mid-photon could release a shower of new photons.
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Diffraction Grating: How Thousands of Slits Turn Light into a Spectrum
Tilt a CD or DVD under a desk lamp and a band of color sweeps across its surface. The disc is not painted; it is a spiral of microscopic pits, packe…
South Korea’s LetinAR is building optics behind AI glasses
A lens the size of a thumbnail — and the South Korean startup that makes it could become the optical backbone of the AI glasses era.