Failure And Reexamination Of The Raman Scattering Enhancement Factor Predicted By The Enhanced Local Electric Field In A Silver Nanorod

Abstract

The Raman scattering of a molecule will be enhanced when it is placed near a metal nanoparticle and the enhancement factor was believed to be proportional to the enhanced local electric field |E|2 at both excitation and scattering wavelengths. The original prediction was derived based on spherical particles but was popularly applied to different configurations. Using electrodynamics theory, we directly calculated the enhancement factor of the Raman scattering at scattering wavelengths when a molecule is placed near a silver nanorod. Contrary to the previous theory, we found that the correlation between the Raman scattering enhancement factor and the enhanced local electric field at scattering wavelengths completely disappeared when different modes of the rod were excited. These two factors can be different from each other by over 50 folds and even show different trends in the studied system. The calculations showed that the Raman scattering enhancement factor cannot be simply predicted using the enhanced local electric field in a complex system. The correct value should be calculated using the introduced electrodynamics model.

Publication Date

12-10-2015

Publication Title

Journal of Physical Chemistry C

Volume

119

Issue

49

Number of Pages

27683-27687

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acs.jpcc.5b08726

Socpus ID

84949646674 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84949646674

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