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Phys Rev Lett. 2002 Nov 11;89(20):203002. Epub 2002 Oct 24.

Fluorescence quenching of dye molecules near gold nanoparticles: radiative and nonradiative effects.

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Photonics and Optoelectronics Group, Physics Department and CeNS, University of Munich, 80799 Munich, Germany.


The radiative and nonradiative decay rates of lissamine dye molecules, chemically attached to differently sized gold nanoparticles, are investigated by means of time-resolved fluorescence experiments. A pronounced fluorescence quenching is observed already for the smallest nanoparticles of 1 nm radius. The quenching is caused not only by an increased nonradiative rate but, equally important, by a drastic decrease in the dye's radiative rate. Assuming resonant energy transfer to be responsible for the nonradiative decay channel, we compare our experimental findings with theoretical results derived from the Gersten-Nitzan model.

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