Le Fei, Brandl Daniel W, Urzhumov Yaroslav A, Wang Hui, Kundu Janardan, Halas Naomi J, Aizpurua Javier, Nordlander Peter
Department of Physics and Astronomy, M.S. 61, Rice University Houston, Texas 77005, USA.
ACS Nano. 2008 Apr;2(4):707-18. doi: 10.1021/nn800047e.
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.
最近发现，纳米壳阵列具有理想的特性，可作为结合表面增强拉曼散射（SERS）和表面增强红外吸收（SEIRA）光谱的基质，在结构上的相同空间位置具有大的场增强。对于较小的粒子间距离，单个纳米壳的多极等离子体共振会发生杂化并形成红移带，近红外（NIR）中相对较窄的带源自增强SERS的四极纳米壳共振，而中红外（MIR）中非常宽的带则由增强SEIRA的偶极共振产生。MIR和更长波长处的大场增强是由于避雷针效应，并且可以用静电模型很好地描述。
