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

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17 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

Fingerprint

Raman scattering
Raman spectra
electromagnetism
dipoles
Nanoparticles
nanoparticles
augmentation
symmetry
Strip metal
Backscattering
Photonics
metal strips
Scattering
wave excitation
approximation
strip
backscattering
plane waves
spacing
photonics

ASJC Scopus subject areas

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

Cite this

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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 0;ω s)| 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.",
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