Symmetry breaking in a plasmonic metamaterial at optical wavelength
Symmetry breaking in a plasmonic metamaterial at optical wavelength
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DOI：
10.1021/nl0805559
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发表时间：
2008-08-01
期刊：
影响因子：
10.8
通讯作者：
Tikhodeev, Sergei G.
中科院分区：
文献类型：
--
作者：
Christ, Andre;Martin, Olivier J. F.;Tikhodeev, Sergei G.
我们数值研究了由金纳米线制成的等离子体超材料中结构不对称性的影响。据报道，光学非活性（即，光学暗的）对称线晶格的粒子等离子体激元模式在引入结构对称性破缺时立即耦合到辐射场。这种高阶等离子体共振的特征在于它们的次辐射性质。它们通常显示出较长的寿命和明显的吸收损失。结果表明，近场相互作用强烈地决定这些模式。
We numerically study the effect of structural asymmetry in a plasmonic metamaterial made from gold nanowires. It is reported that optically inactive (i.e., optically dark) particle plasmon modes of the symmetric wire lattice are immediately coupled to the radiation field, when a broken structural symmetry is introduced. Such higher order plasmon resonances are characterized by their subradiant nature. They generally reveal long lifetimes and distinct absorption losses. It is shown that the near-field interaction strongly determines these modes.