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Analytical Model of Raman Enhancement by Metal Nanoparticles

Published online by Cambridge University Press:  29 May 2012

Greg Sun  and
Jacob B. Khurgin
Greg Sun
Affiliation:
University of Massachusetts Boston, Boston, Massachusetts 02125, U.S.A.
Jacob B. Khurgin
Affiliation:
Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
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Abstract

We present an analytical model for the enhancement of molecular Raman process by metal nanoparticles. The result is compared with that of a PL process. Although both processes are similar in the sense that they are both a two-photon process in which one photon is absorbed and another photon at a different frequency is emitted, the SP enhancement mechanisms for these two processes have some rather distinct features. In addition to stronger enhancement, the Raman process shows no sign of quenching ever taking place even when the molecule is placed right at the surface of the metal nanoparticle – a situation that will lead to strong quenching effect in PL measurement. Significant advantages of our analytical approach include not just predications that are consistent with experimental observations, but rather a clear insight for the actual physical process at work.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1404: Symposium W – Phonons in Nanomaterials–Theory, Experiments and Applications , 2012 , mrsf11-1404-w05-06
Copyright
Copyright © Materials Research Society 2012

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