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arXiv 0704.0451cond-mat.mes-hall
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用于表面增强拉曼光谱的电迁移纳米间隙

Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

D. R. Ward, N. K. Grady, C. S. Levin, N. J. Halas, Y. Wu, P. Nordlander, D. Natelson

摘要:

具有化学特异性的单分子检测是生物学、化学、物理学和传感技术的强大且非常期望的工具。表面增强光谱使单分子研究成为可能,但具有足够灵敏度的可靠底物供应短缺。我们提出了一个简单的,可扩展的衬底表面增强拉曼光谱(SERS)纳入纳米级的电迁移的间隙之间的扩展电极。纳米间隙活性区域中的分子表现出非常高的拉曼灵敏度的特征,包括闪烁和光谱扩散。电动力学模拟显示等离子体聚焦,使电磁增强接近单分子SERS所需的。

英文摘要:

Single-molecule detection with chemical specificity is a powerful and much desired tool for biology, chemistry, physics, and sensing technologies. Surface-enhanced spectroscopies enable single molecule studies, yet reliable substrates of adequate sensitivity are in short supply. We present a simple, scaleable substrate for surface-enhanced Raman spectroscopy (SERS) incorporating nanometer-scale electromigrated gaps between extended electrodes. Molecules in the nanogap active regions exhibit hallmarks of very high Raman sensitivity, including blinking and spectral diffusion. Electrodynamic simulations show plasmonic focusing, giving electromagnetic enhancements approaching those needed for single-molecule SERS.

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