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Croissance et contrôle de l'émission spontanée de boîtes quantiques semiconductrices CdSe/ZnSe placées en microcavités optiques

Abstract : In this work, CdSe/ZnSe semiconductor quantum dots are grown by molecular beam epitaxy and placed into pillar microcavities to control their spontaneous emission. When an emitting dipole is located in a small volume optical cavity and resonant with a cavity mode, its radiative lifetime can be strongly reduced: this is the Purcell effect.
We first present a new method for growing self-assembled CdSe/ZnSe quantum dots. Structural characterizations by Atomic Force Microscopy, Transmission Electron Microscopy and High Resolution X-Ray Diffraction are presented. Optical studies performed on a large assembly of quantum dots or on a single quantum dot allow us to characterize the confinement of the carriers into the quantum dots as well as the thermal activation of the non-radiative deexcitation channels. Finally, those quantum dots are located into micropillars to control their spontaneous emission. The microcavities are elaborated using oxide deposition for the Bragg mirrors and CdSe/ZnSe quantum dots as active media. Time-resolved photoluminescence measurements on a series of single quantum dots probe the Purcell effect. A three-fold enhancement of quantum dot spontaneous emission rate is observed for quantum dots in resonance with excited degenerated modes of the pillar.
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https://tel.archives-ouvertes.fr/tel-00011126
Contributor : Regis Andre <>
Submitted on : Monday, November 28, 2005 - 2:06:39 PM
Last modification on : Tuesday, September 11, 2018 - 11:00:02 AM
Long-term archiving on: : Friday, September 14, 2012 - 4:05:11 PM

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  • HAL Id : tel-00011126, version 1

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Ivan-Christophe Robin. Croissance et contrôle de l'émission spontanée de boîtes quantiques semiconductrices CdSe/ZnSe placées en microcavités optiques. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011126⟩

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