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Nanotechnology that bosses light around to make one-way images

Could computers one day work with light?

two panels: one is grey with a faint image of australia and the sydney opera house on it next to a 50 micrometre scale bar, the other has images of australia and the sydney opera house individually lit up in blue
A 'metasurface' that displays two different images, depending on which way light is passing through it. Credit: Kruk et al., 2022, Nature Photonics - doi: 10.1038/s41566-022-01018-7
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