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This article was originally published in Vol. 6 of the Journal of Nanophotonics on 21 June 2012 with an incorrect citation identifier (CID) of 011508. The paper was removed and republished online with the correct CID of 061508 on 25 June 2012. For more information on the use of CIDs in JNP, see http://spiedigitallibrary.org/jnp/citation_format. |