Universität Potsdam Institut für Physik KarlLiebknechtStr. 24/25 14476 PotsdamGolm 



AbstractWe study the spontaneous emission of a single emitter close to a metallic nanoparticle, with the aim to clarify the distance dependence of the radiative and nonradiative decay rates. We derive analytical formulas based on a dipoledipole model, and show that the nonradiative decay rate follows a $R^{6}$ dependence at short distance, where $R$ is the distance between the emitter and the center of the nanoparticle, as in Försters energy transfer. The distance dependence of the radiative decay rate is more subtle. It is chiefly dominated by a $R^{3}$ dependence, a $R^{6}$ dependence being visible at plasmon resonance. The latter is a consequence of radiative damping in the effective dipole polarisability of the nanoparticle. The different distance behavior of the radiative and nonradiative decay rates implies that the apparent quantum yield always vanishes at short distance. Moreover, nonradiative decay is strongly enhanced when the emitter radiates at the plasmonresonance frequency of the nanoparticle. file generated: 18 Apr 2007


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