Metamaterials are the key to perfect lenses, 'invisibility' cloaks and slow and stored broadband light. A three-dimensional optical metamaterial with a negative refractive index has now been created.
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Hess, O. Farewell to Flatland. Nature 455, 299–300 (2008). https://doi.org/10.1038/455299a
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DOI: https://doi.org/10.1038/455299a
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