Abstract
The application of semiconductor quantum dots in important new areas such as randomlasing and quantum-information processing requires knowledge of the coherence of theoptical emission from such systems. We report the first direct experimental estimation ofthe coherence in the light emitted by a nanoparticle ensemble. The photoluminescence froma two-phase nanocomposite CdS–ZnO thin film (with a characteristic grain size of 2–3 nmfor both the chemical phases) possesses an appreciable degree of spatial and temporalcoherence at room temperature. The degree of spatial coherence was estimated from theclassical Young’s double slit experiment. We also discuss a simple technique forestimating the degree of spectral coherence of the photoluminescence from thin films.
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