Structural effects in the electromagnetic enhancement mechanism of Surface-enhanced Raman scattering: Dipole reradiation and rectangular symmetry effects for nanoparticle arrays

Logan K. Ausman, Shuzhou Li, George C. Schatz

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Surface-enhanced Raman scattering (SERS) enhancement factors for Ag and Au sphere array structures are determined by rigorously including dipole reradiation in a T-matrix formalism. Comparisons are made with the more commonly used local field enhancement due to plane-wave excitation, |E(r 0;ω)| 2|E(r 0s)| 2 which for zero Stokes shift is |E(r 0;ω)| 4 to determine the errors associated with this approximation. Substantial errors (factors of 10.100) are found for the peak enhancements at a scattering angle well away from the incident direction, but for backscattering, the errors are negligible. We also present |E|4 enhancement factors using a periodic boundary discrete dipole approximation method for several metal strip array structures, and we show that a certain combination of rectangular array structure and strip properties leads to electromagnetic enhancement factors for mixed photonic-plasmonic resonances that are considerably higher than can be produced with either square arrays or 1-D arrays based on the same particles and spacings.

Original languageEnglish
Pages (from-to)17318-17327
Number of pages10
JournalJournal of Physical Chemistry C
Volume116
Issue number33
DOIs
Publication statusPublished - Aug 23 2012

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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