Harald Giessen

Senior researcher, University of Stuttgart

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Last updated Nov 9, 2026

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Silicon air-hole metasurface focuses ultraviolet light

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Professor at the University of Stuttgart

Silicon absorbs ultraviolet light, which is why UV optics usually depend on curved mirrors made from other materials. A University of Stuttgart team etched tiny air-filled cavities into silicon and used them to focus 325-nanometer light on a flat surface.

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