About this Journal Submit a Manuscript Table of Contents
Journal of Nanomaterials
Volume 2007 (2007), Article ID 12086, 10 pages
http://dx.doi.org/10.1155/2007/12086
Research Article

Electromagnetic Modelling of Raman Enhancement from Nanoscale Structures as a Means to Predict the Efficacy of SERS Substrates

Analytical Science Group, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK

Received 19 March 2007; Accepted 31 July 2007

Academic Editor: Christian Brosseau

Copyright © 2007 Richard J. C. Brown et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The requirement to optimise the balance between signal enhancement and reproducibility in surface enhanced Raman spectroscopy (SERS) is stimulating the development of novel substrates for enhancing Raman signals. This paper describes the application of finite element electromagnetic modelling to predict the Raman enhancement produced from a variety of SERS substrates with differently sized, spaced and shaped morphologies with nanometre dimensions. For the first time, a theoretical comparison between four major generic types of SERS substrate (including metal nanoparticles, structured surfaces, and sharp tips) has been performed and the results are presented and discussed. The results of the modelling are consistent with published experimental data from similar substrates.