Investigation of particle shape and size effects in SERS using T-matrix calculations

被引:87
作者
Boyack, Rufus [1 ]
Le Ru, Eric C. [1 ]
机构
[1] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington 6143, New Zealand
关键词
ENHANCED ELECTRIC INTENSITIES; RAMAN-SCATTERING SERS; REFERENCE DATABASE; OPTICAL-PROPERTIES; LIGHT-SCATTERING; SURFACE; FIELDS; AG;
D O I
10.1039/b905645a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:7398 / 7405
页数:8
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