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Phenomenological local field enhancement factor distributions around electromagnetic hot spots
7.E. C. Le Ru and P. G. Etchegoin, Principles of Surface-Enhanced Raman Scattering and Related Plasmonic Effects (Elsevier, Amsterdam, 2009).
17.E. C. Le Ru, J. Grand, N. Felidj, J. Aubard, G. Levi, A. Hohenau, J. R. Krenn, E. Blackie, and P. G. Etchegoin, J. Phys. Chem. C 112, 8117 (2008).
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We propose a general phenomenological description of the enhancement factor distribution for surface-enhanced Raman scattering(SERS) and other related phenomena exploiting large local field enhancements at hot spots. This description extends naturally the particular case of a single (fixed) hot spot, and it is expected to be “universal” for many classes of common SERS substrates containing a collection of electromagnetic hot spots with varying geometrical parameters. We further justify it from calculations with generalized Mie theory. The description studied here provides a useful starting point for a qualitative (and semiquantitative) understanding of experimental data and, in particular, the analysis of the statistics of single-molecule SERS events.
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