References 1. R. Zhao, et al., 18, 2010 Optics Express 2. H. Liu, et al., 3, 157, 2009 Nature Photonics 3. S. Lee, et al., 936, 2012 11, Nature Materials
References 1. R. Zhao, et al., Optics Express 18, 2010 2. H. Liu, et al., Nature Photonics 3, 157, 2009 3. S. Lee, et al., Nature Materials 11, 936, 2012
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