Investigation of particle shape and size effects in SERS using T-matrix calculations
- 9 June 2009
- journal article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 11 (34), 7398-7405
- https://doi.org/10.1039/b905645a
Abstract
The influence of particle size and shape effects on average and punctual surface-enhanced Raman scattering (SERS) enhancement factors (EFs) is investigated using exact T-matrix electrodynamic calculations of silver and gold spheroids over a large parameter space. This study extends the conventional treatment of these effects within the frameworks of the electrostatics approximation, its generalizations, or Mie theory for spheres. It confirms the qualitative features of these approaches, but provides in addition quantitative predictions of SERS EFs in the case of large non-spherical particles, where the lightning-rod effect (shape effect) and radiation damping (size effect) operate simultaneously. Finally, the localization effect at large SERS EF (hot-spots) is shown to be dictated only by shape, not size, in the case of metallic spheroids at the dipolar localized surface plasmon resonance.Keywords
This publication has 33 references indexed in Scilit:
- A perspective on single molecule SERS: current status and future challengesPhysical Chemistry Chemical Physics, 2008
- Surface-Enhanced Raman Spectroscopy of DNAJournal of the American Chemical Society, 2008
- Surface Enhanced Raman Scattering Enhancement Factors: A Comprehensive StudyThe Journal of Physical Chemistry C, 2007
- Enhancement factor distribution around a single surface-enhanced Raman scattering hot spot and its relation to single molecule detectionThe Journal of Chemical Physics, 2006
- In Vivo Glucose Measurement by Surface-Enhanced Raman SpectroscopyAnalytical Chemistry, 2006
- Proof of Single-Molecule Sensitivity in Surface Enhanced Raman Scattering (SERS) by Means of a Two-Analyte TechniqueThe Journal of Physical Chemistry B, 2006
- Progress in plasmonic engineering of surface-enhanced Raman-scattering substrates toward ultra-trace analysisAnalytical and Bioanalytical Chemistry, 2005
- T-matrix theory of electromagnetic scattering by partciles and its applications: a comprehensive reference databaseJournal of Quantitative Spectroscopy and Radiative Transfer, 2004
- Scattering of electromagnetic waves by arbitrarily shaped dielectric bodiesApplied Optics, 1975
- Light Scattering by a Spheroidal ParticleApplied Optics, 1975