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Etude des processus optiques non-linéaires cohérents des semiconducteurs nanostructurés en microcavité

Abstract : This thesis concerns the coherent non-linear optical processes of nanostructured semiconductors in microcavity. An ultra-fast and low-dissipative optical gate feasibility, with low switching energy (~µJ/cm²) is demonstrated. Diffraction and degenerated pump-probe experiments have been performed on semiconductor microcavitiesat room temperature. A fast semiconductor dielectric function modulation is induced by photon energy excitations below the band gap energy. A 2% diffraction efficiency and a 5:1 contrast ratio reflectivity modulation have been measured using a low axcitation energy (~µJ/cm²). This ultra-fast optical modulation has been attributed to the optical Stark effect. Light/matter interaction is exalted by inserting the non-linear material in a Fabry-Pérot microcavity; command intensity is thus lowered. A numerical study of a microcavity with an absorbent medium has been performed. We have shown that the minimum of reflectivity does not occur at the resonant wavelength Λres but at a pseudo-resonant wavelength Λres. The shift between these two wavelengths can reach several nanometers. Taking into account this study, a modeling of microcavity-coupled optical Stark effect has been proposed. A good agreement between experiments and modelling is demonstrated and open a way to study the microcavity elaboration parameters and structure design well suited to all optical modulation with low switching energy.
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Submitted on : Thursday, November 10, 2005 - 3:39:30 PM
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  • HAL Id : tel-00010947, version 1

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Stéphanie Sanchez. Etude des processus optiques non-linéaires cohérents des semiconducteurs nanostructurés en microcavité. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2003. Français. ⟨tel-00010947⟩

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