Metallic nanoparticle arrays: A common substrate for both surface-enhanced Raman scattering and surface-enhanced infrared absorption
Metallic nanoparticle arrays: A common substrate for both surface-enhanced Raman scattering and surface-enhanced infrared absorption
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DOI：
10.1021/nn800047e
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发表时间：
2008-04-01
期刊：
影响因子：
17.1
通讯作者：
Nordlander, Peter
中科院分区：
文献类型：
--
作者：
Le, Fei;Brandl, Daniel W.;Nordlander, Peter
最近发现纳米壳阵列具有理想的性质，作为结合表面增强拉曼散射（Sers）和表面增强红外吸收（SEIRA）光谱的基底，在结构上的相同空间位置具有大的场增强。对于小的颗粒间距离，各个纳米壳的多极等离子体共振杂交并形成红移带，在近红外（NIR）中的相对窄的带源自增强Sers的四极纳米壳共振，并且在中红外（MIR）中的非常宽的带源自增强SEIRA的偶极共振。在和平号和更长的波长的大字段增强是由于避雷针效应，并与静电模型很好地描述。
Nanoshell arrays have recently been found to possess ideal properties as a substrate for combining surface enhanced raman scattering (SERS) and surface enhanced infrared absorption (SEIRA) spectroscopies, with large field enhancements at the same spatial locations on the structure. For small interparticle distances, the multipolar plasmon resonances of individual nanoshells hybridize and form red-shifted bands, a relatively narrow band in the near-infrared (NIR) originating from quadrupolar nanoshell resonances enhancing SERS, and a very broadband in the mid-infrared (MIR) arising from dipolar resonances enhancing SEIRA. The large field enhancements in the MIR and at longer wavelengths are due to the lightning-rod effect and are well described with an electrostatic model.