Abstract
We demonstrate that the fluorescence rate from a single moleculewith near-unity quantum yield can be enhanced by a factor of≈10 by use of a single laser-irradiated noble metal nanoparticle. The increased fluorescence rate isprimarily the result of the local field enhancement. However, at particle–molecule distancesshorter than 2 nm, nonradiative decay of the excited molecule due to energy transfer to themetal dominates over the local field enhancement giving rise to fluorescence quenching.These counteracting processes depend on the wavelength-dependent dielectric function ofthe particle antenna. In this study, we quantitatively compare single-molecule fluorescenceenhancement near 80 nm gold and silver nanoparticles excited at a fixed wavelength ofλ = 637 nm. In accordance with theory we find similar enhancements for both gold and silvernanoparticles.
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