Quantum mechanical study of plasmonic coupling in sodium nanoring dimers
Quantum mechanical study of plasmonic coupling in sodium nanoring dimers
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DOI：
10.1063/1.4745654
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发表时间：
2012-08
影响因子：
4
通讯作者：
Haifeng Yin;Hong Zhang
中科院分区：
文献类型：
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作者：
Haifeng Yin;Hong Zhang
在钠纳米环二聚体中，用时变密度泛函理论研究了等离子体共振和等离子体诱导的场增强。光吸收、感应电荷响应和频率相关电流表明，等离子体共振模式主要为电荷转移等离子体模式和键合二聚体等离子体模式（BDP）。此外，还有两种小的杂化等离子体模式。每个空间区域的感应场增强取决于间隙距离和等离子体模式。对于窄间隙，两纳米环之间直线段不同位置的场增强几乎均匀分布。然而，对于较大的分离，沿轴向，在钠原子半径范围内，场增强逐渐减弱。那么，场增强的变化是非线性的。对于不同的等离激元模式，存在不同数量的场增强极值。最大的极值位于…
In sodium nanoring dimers, plasmon resonances and the plasmon-induced field enhancement are investigated by time-dependent density functional theory. The optical absorption, the induced charge response, and the frequency dependent current demonstrate that the main plasmon resonance modes are the charge transfer plasmon mode and the bonding dimer plasmon mode (BDP). Moreover, there are also two small hybridized plasmon modes. The induced field enhancement of each spatial region depends on the gap distance and the plasmon mode. For the narrow gap, the field enhancement at different positions of the straight line segments between two nanorings is almost uniformly distributed. However, for large separations, along the axial direction, the field enhancement gradually decreases in the region within the radius of the sodium atom. Then, the change of the field enhancement is nonlinear. For different plasmon modes, there is a different number of field enhancement extrema. The largest extreme value is located in th...