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The Effect of Surface Roughness on the Extinction Spectra and Electromagnetic Fields around Gold Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Shuzhou Li  and
George C. Schatz
Shuzhou Li
Affiliation:
li@northwestern.edu, Northwestern University, Department of Chemistry, 2145 Sheridan Rd, Evanston, IL, 60208, United States
George C. Schatz
Affiliation:
schatz@chem.northwestern.edu, Northwestern University, Department of Chemistry, 2145 Sheridan Rd,, Evanston, IL, 60208, United States
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Abstract

Electromagnetic enhancement arising from plasmon resonance excitation plays a major role in surface-enhanced Raman spectroscopy (SERS), and as a result nanoparticle morphology can significantly affect SERS intensities. In this paper we have calculated these enhancements as well as extinction spectra using the discrete dipole approximation for a system consisting of a dimer of gold disks that is made using on-wire lithography. Including surface roughness in the calculations leads to SERS enhancements for the disks whose dependence on disk spacing and thickness is in agreement with experimental measurements, with a maximum enhancement when the thickness of the disk and the disk-disk gap are 100 nm and 32 nm, respectively. These results are in better agreement with experiments than earlier estimates based on flat surfaces.

Keywords

nanostructureoptical propertiessimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1087: Symposium V – Crystal-Shape Control and Shape-Dependent Properties – Methods, Mechanism, Theory, and Simulation , 2008 , 1087-V01-08
Copyright
Copyright © Materials Research Society 2008

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