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Symmetry breaking and optical negative index of closed nanorings

Author

Listed:
  • 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
    Lawrence Berkeley National Laboratory)

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.

Suggested Citation

  • Boubacar Kanté & Yong-Shik Park & Kevin O’Brien & Daniel Shuldman & Norberto D. Lanzillotti-Kimura & Zi Jing Wong & Xiaobo Yin & Xiang Zhang, 2012. "Symmetry breaking and optical negative index of closed nanorings," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2161
    DOI: 10.1038/ncomms2161
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