Dielectric-substrate-induced surface-enhanced Raman scattering

被引：18

作者：

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

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

Alexson, D. A. ^{[1
]}

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

Fu, A. ^{[1
]}

Mastro, M. A. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 08期

关键词：

dielectric materials; finite element analysis; metallic thin films; nanowires; plasmonics; point contacts; silver; surface enhanced Raman scattering; SILVER ELECTRODE; NANOPARTICLES; SPECTROSCOPY; FABRICATION; MICROSCOPY; MOLECULES; PYRIDINE; SPECTRA; SERS;

D O I：

10.1103/PhysRevB.80.085416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It is shown through experimental mapping of surface-enhanced Raman scattering (SERS) from dielectric core nanowires exposed to benzene thiol that any dielectric substrate plays a critical role in the SERS enhancement. Theoretical calculations of the plasmonic enhancement using finite element methods confirms the role that the substrate plays in increasing the intensity and spatial extent of the SERS enhancement. It is shown that because of the cylindrical shape of the nanowires, significant SERS hot spots form not only between crossed nanowires but also at the point of contact between the nanowires and the substrate on which they are placed. This result also applies to any structure whose geometry results in a point or line contact with an underlying substrate.

引用

页数：6

共 28 条

[1] ANOMALOUSLY INTENSE RAMAN-SPECTRA OF PYRIDINE AT A SILVER ELECTRODE [J].