The effect of surface roughness on the extinction spectra and electromagnetic fields around gold nanoparticles

Shuzhou Li*, George C Schatz

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium Proceedings - Crystal-Shape Control and Shape-Dependent Properties-Methods, Mechanism, Theory and Simulation
Pages13-16
Number of pages4
StatePublished - Dec 1 2008
EventCrystal-Shape Control and Shape-Dependent Properties-Methods, Mechanism, Theory and Simulation - San Francisco, CA, United States
Duration: Mar 24 2008Mar 28 2008

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1087
ISSN (Print)0272-9172

Other

OtherCrystal-Shape Control and Shape-Dependent Properties-Methods, Mechanism, Theory and Simulation
CountryUnited States
CitySan Francisco, CA
Period3/24/083/28/08

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Li, S., & Schatz, G. C. (2008). The effect of surface roughness on the extinction spectra and electromagnetic fields around gold nanoparticles. In Materials Research Society Symposium Proceedings - Crystal-Shape Control and Shape-Dependent Properties-Methods, Mechanism, Theory and Simulation (pp. 13-16). (Materials Research Society Symposium Proceedings; Vol. 1087).