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Theses

Etude des propriétés optiques des nanotubes de carbone

Abstract : This thesis deals with the linear and non-linear optical properties of single wall carbon nanotubes.
Optical absorption spectroscopy is used for the caracterization of nanotubes (mean diameter, diameter distribution) in different samples.
The observation of band gap photoluminescence requires specific steps in the sample preparation. In particular nanotubes need to be isolated in order to emit light. The combination of photoluminescence and excitation of photoluminescence experiments allows the determination of the nanotubes chiralities.
Ultrafast carrier dynamics in carbon nanotubes has been investigated. When nanotubes are aggregated in ropes, the dynamics is dominated by the tunnel coupling between metallic and semi-conducting nanotubes. The efficiency of this coupling explains the absence of photoluminescence signal on these kinds of samples. On the contrary, intra sub-band and inter-band relaxation times increase by one order of magnitude when nanotubes are isolated. Non-resonant time-resolved measurements give evidence for the $\pi$~-plasmon contribution to the nanotubes non-linear response. Furthermore, it allows the identification of the absorption background, on which the interband transition are superimposed, to the low energy tail of the $\pi$~plasmon resonance. Finally, the third order non-linear susceptibility of a 50 nm thick nanotube film deposite on a glass substrate is evaluated and compared to other classical materials for non-linear optics.
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Theses
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https://tel.archives-ouvertes.fr/tel-00004218
Contributor : Jean-Sébastien Lauret <>
Submitted on : Monday, January 19, 2004 - 6:39:06 PM
Last modification on : Monday, December 14, 2020 - 6:12:43 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 12:35:18 PM

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  • HAL Id : tel-00004218, version 1

Citation

Jean-Sébastien Lauret. Etude des propriétés optiques des nanotubes de carbone. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00004218⟩

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