Subwavelength holes in metal films are well known to offer extraordinary-light-transmission properties. Now a group of scientists in France have exploited such nanoholes to sort photons by colour.
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van Hulst, N. Sorting colours. Nature Photon 2, 139–140 (2008). https://doi.org/10.1038/nphoton.2008.10
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DOI: https://doi.org/10.1038/nphoton.2008.10