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Bulletin of the Russian Academy of Sciences Physics

Single nanoparticle quantum dynamics studied by the photon distribution function

Игорь Сергеевич Осадько, V. V. Fedyanin

Published Jul 1, 2010• 0 citations
Publisher

Abstract

The blinking fluorescence of a single nanoparticle excited by CW laser radiation was studied. In the case of a low time resolution setup, blinking fluorescence appears to be a continuous emission. Blinking can nevertheless be established if we measure the photon distribution function in such quasi-continuous fluorescence.
DOI
10.3103/s1062873810070063

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An analysis of intermittent fluorescence is presented for a single molecule driven by a continuous-wave laser field. The interruptions of fluorescence are caused by transition of the molecule to a triplet state. A method previously developed to calculate photon distribution for continuous-wave fluorescence is applied to analyze photon statistics of fluorescence blinking. The probability w N (T) of counting N photons over a time interval T is derived for intermittent fluorescence. The photons counted over relatively short intervals are found to have a sub-Poissonian (narrower than Poisson) distribution. The photon distribution over intervals longer than the mean off time has a complicated form with two maxima; i.e., a super-Poissonian (wider than Poisson) distribution is obtained.