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Spectroscopie optique nonlinéaire à 1,55 μm de boîtes quantiques et de nanotubes de carbone

Abstract : The original spectral hole-burning spectroscopy is implemented to study homogeneous broadening of optical transitions at 1.55 μm in two different kinds of nanosystems. For GaN/AlN quantum dots, our experiment makes up the first direct measurement of the homogeneous linewidth of the s − pz intraband transition. The square-root dependence of the differential transmission signal with the incident pump power reveals the importance of Auger scattering in population relaxation dynamics. The homogeneous spectral profile turns out to be gaussian. The strong increase of homogeneous broadening between 5K and 30K suggests different dephasing mechanisms other than phonon-coupling. In the case of carbon nanotubes, our experimental setup allows us to study thoroughly the change of absorption homogeneous spectra over a wide range of pump power and for temperatures ranging from 5K to 300 K. The power dependence of the signal shows quantitatively the prevailing contribution of collisional broadening and the marginal contribution of oscillator strength reduction to the optical nonlinear signal. We analyzed two types of exciton-exciton interaction : Exciton-Exciton Annihilation (EEA) and Exciton-Exciton Scattering (EES) and we reveal the special Wannier-Frenkel hybrid nature of excitons in carbon nanotubes. Finally, we study the phonon-assisted dephasing and we highlight original features of the exciton-phonon coupling in unidimensional systems such as carbon nanotubes.
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Contributor : Dac Trung Nguyen <>
Submitted on : Saturday, December 3, 2011 - 4:18:08 PM
Last modification on : Thursday, December 10, 2020 - 12:37:02 PM
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  • HAL Id : tel-00628240, version 3


Dac Trung Nguyen. Spectroscopie optique nonlinéaire à 1,55 μm de boîtes quantiques et de nanotubes de carbone. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨tel-00628240v3⟩



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