Multiple surface plasmon resonances and near-infrared field enhancement of gold nanowells
Multiple surface plasmon resonances and near-infrared field enhancement of gold nanowells
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DOI：
10.1021/ac800149d
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发表时间：
2008-07-01
影响因子：
7.4
通讯作者：
Veres, Teodor
中科院分区：
文献类型：
--
作者：
Li, Kebin;Clime, Liviu;Veres, Teodor
利用电子束光刻技术制备了Au单电池阵列，并对其进行了表面等离子体共振（SPR）和表面增强拉曼散射（Sers）表征。结果表明，这些Au纳米线阵列具有多个SP共振，可以通过调整纳米线的几何特性进行调谐。Sers活性的纳米线的范围内的激发波长和一些模型化合物，包括罗丹明6G（R6G），酞嗪，和单链寡核苷酸确认。根据基于离散偶极近似（DDA）的数值模拟，Sers增强源于位于单个纳米线内部和外部的高电磁场（热点）。此外，在实验中观察到远场之间的相互耦合效应的纳米线阵列与亚波长间距大小。我们发现，Sers增强因子也可以通过调整纳米线的几何形状来调整和优化。
Arrays of Au nanowells (NWs) were fabricated by electron-beam lithography (EBL) and characterized by surface plasmon resonance (SPR) and surface-enhanced Raman scattering (SERS). It is revealed that these Au NW arrays exhibit multiple SP resonances that can be tuned by adjusting the geometrical characteristics of the NWs. SERS activity of An NWs was confirmed for a range of excitation wavelengths and a number of model compounds including rhodamine 6G (R6G), phthalazine, and single-stranded oligonucleotides. According to numerical simulations based on the discrete dipole approximation (DDA), SERS enhancement originates from high electromagnetic fields (hot spots) localized both inside and outside individual NWs. In addition, far-field intercoupling effects between NWs have been observed experimentally in arrays with subwavelength pitch sizes. We show that the SERS enhancement factors can also be tuned and optimized by adjusting the geometry of NWs.