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Contrôle optique de l'émission résonnante de boîtes quantiques semiconductrices

Abstract : This thesis is devoted to the study of the resonant emission of single InAs/GaAs quantum dots embedded in a planar microcavity.By using an original optical fiber setup, the resonant excitation laser is spatially decoupled to the quantum dots emission, in order to suppress the laser scattering which is superimposed with the signal.The power dependence and the measurement of the first and second order correlation functions confirm that a single semiconductor quantum dot under resonant excitation can be considered as a two-level atom-like system. However, the electrostatic environmentdue to unintentional impurities in the sample strongly influencesthe quantum dots resonant emission. A complete inhibition of the resonant emission due to Coulomb blockade appears for the quasi-totality of the quantum dots. This problem is solved by using an additional non-resonant laser at an ultra-low excitation power that acts as an optical gate and controls very efficiently the resonant emission. Thanks to this optical gate, the resonant emission is unblocked and the properties of atwo-level atom-like system are spectacularly recovered. The effect of the optical gate on the resonant signal, the energy shift and the photons emission statistics are well fitted by a random population model that we developed in this thesis.
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Submitted on : Friday, January 13, 2012 - 11:21:25 AM
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  • HAL Id : tel-00659615, version 1

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Hai-Son Nguyen. Contrôle optique de l'émission résonnante de boîtes quantiques semiconductrices. Autre [cond-mat.other]. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨tel-00659615⟩

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