Updates are available Erratum dated 2017-04-01
Click to view Erratum: https://doi.org/10.1038/nphoton.2017.38
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Authors
Liberal, Iñigo
Engheta, Nader
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Article History
Received: 17 September 2016
Accepted: 12 January 2017
First Online: 1 March 2017
Change Date: 6 March 2017
Change Type: Correction
Change Details: Owing to technical problems, this Review Article was published online later than the date given in the print version. The published date should read '1 March 2017', and is correct in the online versions.
Competing interests
: The authors declare no competing financial interests.
