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Acoustique - étude et utilisation de nouvelles sources et transducteurs aux longueurs d'onde nanométriques.

Abstract : This study focuses on acoustic transduction in frequencies ranging from 100 GHz to 1 THz. A picosecond pulsed laser was used to generate and detect high frequency phonons. These transductors are a two-layers pileup of GaAs/AlAs gathered in one superlattice. The optical wave-length sensitivity was experimentally studied. To improve the transduction efficiency, an optical micro cavity was used to increase the interaction between radiation and superlattice. These light-to-sound transducers were used to measure subterahertz and terahertz phonons' lifetime. An anomaly in lifetime frequency dependence was observed in gallium arsenide. Dispersion relation from ab initio calculation coupled with Landau-Rumer phonon lifetime theory fully explain this unexpected anomaly.
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https://theses.hal.science/tel-00945558
Contributor : Romain Legrand Connect in order to contact the contributor
Submitted on : Wednesday, February 12, 2014 - 3:00:07 PM
Last modification on : Tuesday, November 1, 2022 - 8:37:57 PM
Long-term archiving on: : Monday, May 12, 2014 - 11:20:13 PM

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  • HAL Id : tel-00945558, version 1

Citation

Romain Legrand. Acoustique - étude et utilisation de nouvelles sources et transducteurs aux longueurs d'onde nanométriques.. Acoustique [physics.class-ph]. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨NNT : ⟩. ⟨tel-00945558⟩

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