Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy

Autor:	Ward, D. R., Grady, N. K., Levin, C. S., Halas, N. J., Wu, Y., Nordlander, P., Natelson, D.
Rok vydání:	2007
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Nano Lett. 7, 1396-1400 (2007)
Druh dokumentu:	Working Paper
DOI:	10.1021/nl070625w
Popis:	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. Comment: 29 pages, 11 figures (includes supp. material)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0704.0451 Zobrazit plný text záznamu View this record from Arxiv