Nature Photonics 5, 239–242 (2011); published online 6 March 2011; corrected after print 3 June 2011.
Since the publication of the above Letter, the authors have noticed a relevant manuscript that was published in October 1997:
Liu, W. F., Russell, P. St. J. & Dong, L. Acousto-optic superlattice modulator using a fiber Bragg grating. Opt. Lett. 22, 1515–1517 (1997). The manuscript describes positive and negative Doppler shifts at optical frequencies in an acousto-optic superlattic modulator using a fibre Bragg grating. Associated amendments have been made to the text, a citation to this work has been added and the references have been renumbered accordingly. This revision has been made to the HTML and PDF versions of the Letter.
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Chen, J., Wang, Y., Jia, B. et al. Observation of the inverse Doppler effect in negative-index materials at optical frequencies. Nature Photon 5, 436 (2011). https://doi.org/10.1038/nphoton.2011.130
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DOI: https://doi.org/10.1038/nphoton.2011.130
