That the unit cell of a metamaterial can't be considered vanishingly small like in ordinary crystals has long been deemed more burden than opportunity. The emergence of a characteristic length scale in metamaterial chains may change that trend.
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Kadic, M., Frenzel, T. & Wegener, M. When size matters. Nature Phys 14, 8–9 (2018). https://doi.org/10.1038/nphys4287
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DOI: https://doi.org/10.1038/nphys4287
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