Metamaterials are synthetic materials tailored with unusual properties that are not found in nature. It has now been predicted that they could be engineered with negative refractive index through the use of periodic structures via bottom-up self-assembly synthesis.
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Ying, J. Turning a negative into a positive. Nature Chem 4, 159–160 (2012). https://doi.org/10.1038/nchem.1275
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