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Cohérence temporelle des photons uniques émis par un nanocristal individuel de CdSe/ZnS

Abstract : This thesis describes an experiment of Michelson interferometry realized to measure the time coherence of the emission of a single core/shell CdSe/ZnS nanocrystal. The difficulty for such a measurement resides in the fast (0.1 ms) diffusion of their emission line which broadens the measured spectrum. We introduce, in a quantum framework describing the experiment, a method called photon-correlation Fourier spectroscopy (PCFS), based on the measurement of short-delays correlations between the intensities detected at the outputs of the interferometer. Contrary to standard methods, PCFS combines good time- and spectral-resolution (which is theoretically calculated). This allows us to study single nanocrystals at 300, 20 and 10 K, and to characterize both their linewidth and spectral diffusion. We report a 6,5 micro-eV linewidth (corresponding to a 200 ps coherence time), better by almost two orders of magnitude than the linewidths measured by spectroscopy of a single nanocrystal (0.1-1 meV)
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Contributor : Laurent Coolen <>
Submitted on : Monday, March 26, 2007 - 5:55:49 PM
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  • HAL Id : tel-00138537, version 1


Laurent Coolen. Cohérence temporelle des photons uniques émis par un nanocristal individuel de CdSe/ZnS. Physique [physics]. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00138537⟩



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