Gold Nanoparticles Quench Fluorescence by Phase Induced Radiative Rate Suppression
Nano Letters2005Vol. 5(4), pp. 585–589
Citations Over TimeTop 1% of 2005 papers
E. Dulkeith, Moritz Ringler, Thomas A. Klar, Jochen Feldmann, Almudena Muñoz Javier, Wolfgang J. Parak
Abstract
The fluorescence quantum yield of Cy5 molecules attached to gold nanoparticles via ssDNA spacers is measured for Cy5-nanoparticle distances between 2 and 16 nm. Different numbers of ssDNA per nanoparticle allow to fine-tune the distance. The change of the radiative and nonradiative molecular decay rates with distance is determined using time-resolved photoluminescence spectroscopy. Remarkably, the distance dependent quantum efficiency is almost exclusively governed by the radiative rate.
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