Light beams with controllable orbital angular momentum can be generated in the extreme-ultraviolet or soft-X-ray regime, pushing the application of twisted light to the nanoscale.
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Hernández-García, C. A twist in coherent X-rays. Nature Phys 13, 327–329 (2017). https://doi.org/10.1038/nphys4088
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DOI: https://doi.org/10.1038/nphys4088
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