Enhanced plasmon coupling in crossed dielectric/metal nanowire composite geometries and applications to surface-enhanced Raman spectroscopy

被引：81

作者：

Prokes, S. M. ^{[1
]}

Glembocki, O. J. ^{[1
]}

Rendell, R. W. ^{[1
]}

Ancona, M. G. ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 09期

关键词：

D O I：

10.1063/1.2709996

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Surface-enhanced Raman spectroscopy (SERS) was performed on Ga2O3/Ag and ZnO/Ag nanowires, which were arranged in either a crossover or noncrossing geometry. Results indicate a high SERS sensitivity (near 0.2 pg) for nanowires arranged in a crossing geometry. It is suggested that this is due to the dielectric core/metal shell structure, as well as to the nanowire crossings, which are regions of very high electric fields. Finite element simulations of the electric field near two crossed wires confirm an enhanced plasmon resonance in the vicinity of the crossing, which extends spatially in the crossings and around the nanowires. (c) 2007 American Institute of Physics.

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