Emission characterization of a single CdSe-ZnS nanocrystal with high temporal and spectral resolution by photon-correlation Fourier spectroscopy.
We report a spectroscopic study of single colloidal CdSe/ZnS nanocrystals at low temperature. We use photon-correlation Fourier spectroscopy, a technique based on measuring the correlations of the intensities detected at the outputs of a Michelson interferometer. Spectral diffusion over a few microeV is evidenced, on a typical time scale of 200 micros. A time resolution as high as 20 micros is obtained, and an upper limit of 6.5 microeV emission linewidth is measured, corresponding to a coherence time of at least 200 ps, similar to the values for epitaxial quantum dots.
Coolen
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Laboratoire Kastler Brossel, Ecole normale supérieure, Université Pierre et Marie Curie Paris 6, CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France.
Brokmann
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Spinicelli
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Hermier
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JP