On the importance of incorporating dipole reradiation in the modeling of surface enhanced Raman scattering from spheres

Logan K. Ausman, George C Schatz

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Surface enhanced Raman scattering (SERS) enhancement factors G for nanoparticles consisting of a single Ag sphere or a dimer of Ag nanospheres are calculated using a T -matrix method that rigorously incorporates dipole reradiation (DR) effects. A comparison with the commonly used plane wave (PW) approximation, Eloc (ω) 2 Eloc (ω′) 2, which for zero Stokes shift is Eloc (ω)4, is made so as to determine the error associated with using the PW enhancement factor instead of DR in modeling SERS intensities. Calculations for the single sphere are performed for various molecule locations, detector locations, and sphere sizes, while the dimer calculations consider the effects of molecule and detector locations for 50 nm diameter spheres with a 2 nm gap. In both the single sphere and dimer calculations, excellent agreement (

Original languageEnglish
Article number084708
JournalJournal of Chemical Physics
Volume131
Issue number8
DOIs
Publication statusPublished - 2009

Fingerprint

Raman scattering
Raman spectra
dipoles
Dimers
dimers
plane waves
Detectors
Molecules
augmentation
Nanospheres
detectors
matrix methods
molecules
Nanoparticles
nanoparticles
shift
approximation

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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abstract = "Surface enhanced Raman scattering (SERS) enhancement factors G for nanoparticles consisting of a single Ag sphere or a dimer of Ag nanospheres are calculated using a T -matrix method that rigorously incorporates dipole reradiation (DR) effects. A comparison with the commonly used plane wave (PW) approximation, Eloc (ω) 2 Eloc (ω′) 2, which for zero Stokes shift is Eloc (ω)4, is made so as to determine the error associated with using the PW enhancement factor instead of DR in modeling SERS intensities. Calculations for the single sphere are performed for various molecule locations, detector locations, and sphere sizes, while the dimer calculations consider the effects of molecule and detector locations for 50 nm diameter spheres with a 2 nm gap. In both the single sphere and dimer calculations, excellent agreement (",
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