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This ultra-thin surface controls light in two completely different ways

A new metasurface design lets light of different spins bend, focus, and behave independently—while staying sharp across many colors. The trick combines two geometric phase effects so each spin channel can be tuned without interfering with the other. Researchers demonstrated stable beam steering and dual-focus lenses over wide frequency ranges. The approach could scale from microwaves all the way to visible light.

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