Quasi-dark modes in a five-bar plasmonic oligomer

Quasi-dark modes in a five-bar plasmonic oligomer
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五棒等离子体低聚物中的准暗模式

DOI:
10.1364/josab.30.001420
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发表时间:
2013-06
影响因子:
1.9
通讯作者:
Chongjun Jin
Chongjun Jin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yang Shen;Qiangzhong Zhu;Zhangkai Zhou;Chongjun Jin

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我们介绍了一个等离子体低聚物,支持两个准暗模式。双等离子体激元诱导透明光谱是由亮模和两个准暗模之间的Fano干涉产生的。耦合洛伦兹振子模型来解释所产生的线的形状。结果表明,通过改变齐聚物各组分的位置,可以有效地调节两个Fano共振的调制深度和频率。该低聚物可用作基于频移和辐射感测的敏感等离子体标尺。此外,一个人工磁四极也引入了准暗模式。我们期望该低聚物在等离子体激元电路和多波长表面增强拉曼散射的设计中具有重要的应用价值。
We introduce a plasmonic oligomer that supports two quasi-dark modes. A double plasmon-induced transparency spectrum arises from the Fano interference between a bright mode and two quasi-dark modes. A coupling Lorentzian oscillator model is employed to explain the resulting line shape. It is found that the modulation depths and frequency of two Fano resonances can be tuned effectively by displacement of each component of the oligomer. The oligomer can be used as a sensitive plasmon ruler based on both frequency shift and radiance sensing. Furthermore, an artificial magnetic quadrupole is also introduced by one of the quasi-dark modes. We expect that the oligomer will be valuable for the design of plasmonic circuits and multiwavelength surface-enhanced Raman scattering.
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