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Theses

Spectroscopie infrarouge de fils et boîtes quantiques d'InAs/InAlAs/InP(001)

Abstract : Intraband transitions are optical transitions between confined states of the conduction band or the valence band. Spectroscopy of intraband transitions gives an accurate measurement of the confinement energies as well as the spatial symmetry of the wave functions. The main applications are photodetection and unipolar lasers. In 1D and 0D nanostructures, the lateral confinement of the carriers allows intraband transitions polarised in the layer plane. Samples studied in this work have been grown by molecular beam epitaxy. Strains, due to the lattice mismatch between InAs and InP, give rise to nanometric islands in the Stranski-Krastanov growth mode. Structural characterization reveals that it is possible to obtain different types of nanostructures by adjusting growth parameters. The weak lattice mismatch (3%) allows a full coverage of the InAlAs surface by wires, elongated dots or isotropic dots. The samples have been characterized by photoluminescence, photo-induced absorption and photocurrent spectroscopies. These experiment s reveal the presence of intense infrared absorptions (12-14µm), polarized in the layer plane and attributed to optical transition between the ground state and the first excited state confined along [110]. This absorption reaches 26% in 10 planes of n-doped (1012cm-2) elongated dots. We also observe other transitions at shorter wavelength (9-12µm) in the [110] and [1-10] polarisations attributed to transitions between excited states in the conduction band. The synthesis of the different spectroscopies allows the reconstruction of the energetic diagram. Results are in agreement with calculations based on a k.p model.
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https://tel.archives-ouvertes.fr/tel-00002702
Contributor : Frédéric Fossard <>
Submitted on : Wednesday, April 9, 2003 - 10:54:23 AM
Last modification on : Wednesday, October 14, 2020 - 3:56:44 AM
Long-term archiving on: : Tuesday, September 11, 2012 - 8:15:09 PM

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  • HAL Id : tel-00002702, version 1

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Frédéric Fossard. Spectroscopie infrarouge de fils et boîtes quantiques d'InAs/InAlAs/InP(001). Physique [physics]. Université Paris Sud - Paris XI, 2002. Français. ⟨tel-00002702⟩

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