Fluorescence quenching near small metal nanoparticles

Details Fluorescence quenching near small metal nanoparticles Fluorescence quenching near small metal nanoparticles

2012-03-21

arxiv.org/abs/1203.4656v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures

Scientific paper

We develop a microscopic theory for fluorescence of a molecule near a small metal nanoparticle. When a molecule is situated close to metal surface, its fluorescence is quenched due to energy transfer to the metal. We perform quantum-mechanical calculations of energy transfer rates for nanometer-sized Au nanoparticles and find that non-local and quantum-size effects significantly enhance dissipation in metal as compared to those predicted by semiclassical electromagnetic models. However, the dependence of energy transfer rates on molecule's distance to metal nanoparticle surface, $d$, is significantly weaker than the well known $d^{-4}$ behavior for flat metal surface with a sharp boundary calculated within random phase approximation.

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