ABSTRACT
Motivating by recent experiments on surface enhanced Raman scattering (SERS) from colloidal solutions, we present here a simple model to elucidate the effects of extraneous surface charges on the enhanced Raman signal. The model is based on the well-established Gersten-Nitzan model coupled to the modified Mie scattering theory of Bohren and Hunt in the long wavelength approximation. We further introduce corrections from the modified long wavelength approximation to the Gersten-Nitzan model for the improvement of its accuracy. Our results show that the surface charge will generally lead to a blueshift in the resonance frequency and greater enhancements in the SERS spectrum. Possible correlations with the recent experiments are elaborated.
ACKNOWLEDGMENTS
This research is supported by financial aids from National Science Council, Taiwan under Grant Nos. NSC 100-2923-M-002-007-MY3, NSC 101-3113-P-002-021, and NSC 101-2112-M-002-023. We are also grateful to Molecular Imaging Center of National Taiwan University for their support.
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