2011, Vol.14, No.3, pp.211-216
So-called plasmonic nanostructures comprising nanotextured metal surfaces or
dispersed metal nanoparticles in a dielectric medium offer strong
enhancement of light-matter interaction with respect to atoms, molecules,
nano- and microrystalline probes deposited thereon or embedded therein.
Mechanisms and experimental performance of Raman scattering and
photoluminescence enhancement are considered in the context of their
application in high sensitive spectral analysis. So-called "hot spots" are
treated as local areas in plasmonic nanostructures where high Q-factors
develop both for incident light frequency and for emitted or scattered light
frequency. Rationale is provided for 1014 enhancement factor for Raman
scattering which has been claimed based on experimental observation but to
date has never been reported in the theory. Recent results on efficient
Raman scattering enhancement of micrometer-size crystallites by means of
nanometer-size metal particles are discussed. Feasibility of 10- to
102-fold enhancement is highlighted for luminescence.
Key words:
nanoplasmonics, surface enhanced molecular spectroscopy,
biosensors
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