Effective light concentration in gold short nanosphere chain on platinum mirror for surface-enhanced Raman scattering
Effective light concentration in gold short nanosphere chain on platinum mirror for surface-enhanced Raman scattering
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DOI：
10.1063/1.4896688
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发表时间：
2014-09-22
影响因子：
4
通讯作者：
Delaunay, Jean-Jacques
中科院分区：
文献类型：
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作者：
Lee, Yaerim;Abasaki, Minoru;Delaunay, Jean-Jacques
我们研究了紧密间隔的金纳米球链的Pt镜表现出较强的等离子体激元之间的耦合水平和垂直取向的模式相对于链。源自等离子体激元耦合的共振模式实现了短纳米球链周围的有效光集中，并且随着颗粒间间隙长度的减小而显示出红移，揭示了两种等离子体激元模式的混合性质。由于有效的光集中，短的纳米球链表现出强的表面增强拉曼散射（Sers），其不受间隙长度变化或当一些球彼此接触时的强烈影响。即使具有大的间隙，短纳米球链在仅0.4 mW/μ m（2）的低激发功率下也表现出一致Sers，这是由于纳米球和Pt平面的几何稳健性支持球-平面间隙中的电场增强。(C)2014 AIP Publishing LLC.
We studied closely spaced gold nanosphere chains on Pt mirrors exhibiting strong plasmon coupling between both horizontally and vertically oriented modes relative to the chain. Resonance modes originating from the plasmon couplings realized effective light concentration around the short nanosphere chain and showed red shifts with decreasing interparticle gap length, revealing the hybrid nature of the two plasmonic modes. Thanks to the effective light concentration, the short nanosphere chain demonstrated strong surface enhanced Raman scattering (SERS) that was not strongly affected by variations in the length of the gaps or when some of the spheres made contact with each other. Even with large gaps, the short nanosphere chain exhibited consistent SERS under a low excitation power of only 0.4 mW/mu m(2), owing to the geometrical robustness of the nanospheres and Pt plane supporting enhancement of the electric field in the sphere-plane gaps. (C) 2014 AIP Publishing LLC.