Negative refraction can produce optical Veselago lenses with a resolution that is not diffraction-limited. Similar lenses can also be made for electrons, with negative refraction of Dirac fermions now shown in graphene.
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Makk, P. Turn the other way. Nature Phys 11, 894–895 (2015). https://doi.org/10.1038/nphys3505
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DOI: https://doi.org/10.1038/nphys3505
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