In the Technology Focus Industry Perspective 'Harnessing slow light' (Nature Photon. 5, 731–733; 2011), the distances marked in Fig. 2a should have been 400 μm.
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The online version of the original article can be found at 10.1038/nphoton.2011.290
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Correction. Nature Photon 6, 83 (2012). https://doi.org/10.1038/nphoton.2011.346
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DOI: https://doi.org/10.1038/nphoton.2011.346
