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An array of 11 metasurface-based optical spectrometers, pictured here before the final fabrication step. Each spectrometer is composed of three metasurfaces that disperse and focus light with different wavelengths to different points. Credit: Faraon Lab/Caltech

Folded optical devices manipulate light in a new way

Most optical systems require in excess of a single metasurface to work legitimately. In metasurface-based optical systems, the greater part of the total volume...