Symmetry breaking and optical negative index of closed nanorings

Boubacar Kanté, Yong-Shik Park, Kevin O’Brien, Daniel Shuldman, Norberto D. Lanzillotti-Kimura, Zi Jing Wong, Xiaobo Yin and Xiang Zhang ()
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Boubacar Kanté: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Yong-Shik Park: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Kevin O’Brien: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Daniel Shuldman: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Norberto D. Lanzillotti-Kimura: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Zi Jing Wong: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Xiaobo Yin: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California
Xiang Zhang: NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract Metamaterials have extraordinary abilities, such as imaging beyond the diffraction limit and invisibility. Many metamaterials are based on split-ring structures, however, like atomic orbital currents, it has long been believed that closed rings cannot produce negative refractive index. Here we report a low-loss and polarization-independent negative-index metamaterial made solely of closed metallic nanorings. Using symmetry breaking that negatively couples the discrete nanorings, we measured negative phase delay in our composite ‘chess metamaterial’. The formation of an ultra-broad Fano-resonance-induced optical negative-index band, spanning wavelengths from 1.3 to 2.3 μm, is experimentally observed in this structure. This discrete and mono-particle negative-index approach opens exciting avenues towards symmetry-controlled topological nanophotonics with on-demand linear and nonlinear responses.

Date: 2012
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DOI: 10.1038/ncomms2161

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