Several approaches are capable of beating the classical 'diffraction limit'. In the optical domain, not only are superlenses a promising choice: concepts such as super-oscillations could provide feasible alternatives.
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Acknowledgements
I thank Nader Engheta, Fumin Huang, Mark Dennis, Kishan Dholakia and Javier Garcia de Abajo for discussions.
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Zheludev, N. What diffraction limit?. Nature Mater 7, 420–422 (2008). https://doi.org/10.1038/nmat2163
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DOI: https://doi.org/10.1038/nmat2163
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