Orbital angular momentum is a property of light that has many emerging applications, but has been poorly appreciated until recently. The wavelength frontier of orbital angular momentum sources is extending beyond the ultraviolet thanks to research in fields ranging from nanostructures to free-electron lasers.
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Rosenzweig, J.B. Twisted light beyond the visible. Nature Photon 13, 141–143 (2019). https://doi.org/10.1038/s41566-019-0372-z
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DOI: https://doi.org/10.1038/s41566-019-0372-z
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