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Physique de la déflexion picoseconde par réseaux photoinduits dans les semiconducteurs

Abstract : This work is in the scope of the present research concerning all-optical data processing in high-speed telecommunication networks. One possible way to provide all-optical data routing is spatial switching by holographic deflection. The deflection of picosecond laser pulses by the spatial modulation of the density of a photogenerated electron-hole plasma (due to the interference of two optical beams) is theoretically and experimentally studied. After describing the experimental setup and characterizing its performances, we present the results of diffraction experiments on two II-VI samples, CdZnTe (at a wavelength of 0,8micron) and HgCdTe (at a wavelength of 1,55micron). The first order diffraction efficiency amounts up to seven percent in the spectral domain of the Urbach tail of the two investigated semiconducting alloys. The experimental results are explained by a model based on the static screening of local electrical microfields inside the crystal due to LO phonons. Furthermore, diffraction in InGaAs / InGaAsP multiquantum wells embedded in a Fabry-Pérot cavity is investigated. The results are analyzed by a model which takes into account the cavity effects. These give rise to a diffraction enhancement, the limits of which are discussed. Finally, we present results of optical transmission modulation experiments on CdTe / CdZnTe multiquantum wells with an applied external electric field. It is shown that the photogenerated carriers screen the electric field. This gives rise to an absorption variation due to the extinction of the Stark effect in the multiquantum wells. Defining figures of merit, diffraction properties of all studied structures are compared.
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Submitted on : Tuesday, April 3, 2007 - 4:11:04 PM
Last modification on : Friday, January 10, 2020 - 9:08:08 PM
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  • HAL Id : tel-00139835, version 1

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Rodolphe Grac. Physique de la déflexion picoseconde par réseaux photoinduits dans les semiconducteurs. Micro et nanotechnologies/Microélectronique. INSA de Toulouse, 1996. Français. ⟨tel-00139835⟩

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