AI-designed metasurface could make cameras far more light-efficient
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Modern cameras throw away much of the light that enters them. Although the electronic sensor records the intensity of incoming light, it cannot determine its colour. To create a colour image, cameras therefore cover individual detector pixels with red, green or blue filters, each of which rejects most of the spectrum. The familiar Bayer filter has enabled decades of digital photography, but its reliance on absorption places a fundamental constraint on how efficiently a camera can use the availab
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