Distinct Plasmonic Manifestation on Gold Nanorods Induced by the Spatial Perturbation of Small Gold Nanospheres
Distinct Plasmonic Manifestation on Gold Nanorods Induced by the Spatial Perturbation of Small Gold Nanospheres
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DOI：
10.1021/nl2041063
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发表时间：
2012-03-01
期刊：
影响因子：
10.8
通讯作者：
Lin, Hai-Qing
中科院分区：
文献类型：
--
作者：
Shao, Lei;Fang, Caihong;Lin, Hai-Qing
利用散射测量、电动力学模拟和模型分析研究了Au纳米棒和小Au纳米球之间的等离子体激元耦合。纳米球的空间扰动导致异二聚体的不同光谱变化。等离子体响应，包括Fano共振，对纳米球在纳米棒上的位置、差距距离和纳米棒尺寸非常敏感。有趣的是，发现纳米球偶极围绕纳米棒偶极旋转，以实现有利的吸引力相互作用的键合偶极偶极模式。的异质二聚体的纳米球的空间扰动的灵敏的光谱响应提供了一种方法来设计等离子体的标尺的两个空间坐标的传感和高分辨率的测量距离的变化。
The plasmon coupling between a Au nanorod and a small Au nanosphere has been studied with scattering measurements, electrodynamic simulations, and model analysis. The spatial perturbation of the nanosphere leads to distinct spectral changes of the heterodimer. The plasmonic responses, including Fano resonance, are remarkably sensitive to the nanosphere position on the nanorod, the gap distance, and the nanocrystal dimensions. The nanosphere dipole is intriguingly found to rotate around the nano rod dipole to achieve favorable attractive interaction for the bonding dipole dipole mode. The sensitive spectral response of the heterodimer to the spatial perturbation of the nanosphere offers an approach to designing plasmon rulers of two spatial coordinates for sensing and high-resolution measurements of distance changes.