Before they were touted as invisibility cloaks, metamaterials promised a perfect lens. Geoff Brumfiel reports on the struggle for superior vision.
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Brumfiel, G. Metamaterials: Ideal focus. Nature 459, 504–505 (2009). https://doi.org/10.1038/459504a
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DOI: https://doi.org/10.1038/459504a