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- W2118977251 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. Metamaterials using split-ring resonators can display negative refractive index, yet the same effect for closed rings has remained elusive. Kante et al.overcome this by using closely spaced coupled nanorings that exploit symmetry breaking to show broadband negative refractive index at optical frequencies." @default.
- W2118977251 created "2016-06-24" @default.
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- W2118977251 date "2013-03-18" @default.
- W2118977251 modified "2023-09-27" @default.
- W2118977251 title "Symmetry Breaking and Optical Negative Index of Closed Nanorings" @default.
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