Using an electro-optic effect, submicrometre-sized beams have been shown to exhibit non-paraxial propagation over 1,000 Rayleigh lengths. The discovery does not require inhomogeneous or lossy media like plasmon waveguiding.
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Harutyunyan, H. Anti-diffraction of light. Nature Photon 9, 213–214 (2015). https://doi.org/10.1038/nphoton.2015.39
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DOI: https://doi.org/10.1038/nphoton.2015.39