Abstract
Nature Photonics 3, 91–94 (2009); published online: 11 January 2009; corrected online 15 April 2009. The authors wish to correct equation (4) of the above Letter; it should have appeared as shown below. This also affects the final sentence in the third paragraph from the end of page 92, which shouldnow read: For this device, our calculation indicates that over a frequency bandwidth of 1.
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