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Contrôle optique des cathodes froides à base de nanotubes de carbone pour les sources THz

Abstract : The THz field is experiencing a tremendous boom since the late 1980s. However, the design of powerful sources (>10mW) is still difficult so they often remain massive and bulky. Today, research is therefore focused on the development of compact sources using technics from solid electronics, optics or vacuum electronics. This thesis considers an electron tube associated to a premodulated cold cathode. This cathode is an array of vertically aligned carbon nanotubes optimized to extract electrons at low electric field. The nanotubes are grown on a metallic surface grating dedicated to the coupling of a THz dual-frequency laser to the electrons thanks to surface plasmons. The study is focused on the development of the metallic grating and on the understanding of the electronic properties of the new cathode. These directions have led in particular to the fabrication of functional gratings, to quantify the divergence of the electron beam and the development of a thermal annealing technique of nanotubes by pulsed laser. Regarding the fabrication of this new cathode, a technological solution has been developed in compatibility with the high temperature growth of nanotubes (>500°C). The expertise developed during this work should lead to the THz modulation of electron beams and more generally should improve the performances of existing electronic sources or devices based on surface gratings.
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https://pastel.archives-ouvertes.fr/pastel-00543060
Contributor : Pierrick Guiset <>
Submitted on : Wednesday, January 5, 2011 - 9:26:18 PM
Last modification on : Monday, October 19, 2020 - 11:07:48 AM
Long-term archiving on: : Wednesday, April 6, 2011 - 3:34:00 AM

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  • HAL Id : pastel-00543060, version 2

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Pierrick Guiset. Contrôle optique des cathodes froides à base de nanotubes de carbone pour les sources THz. Micro et nanotechnologies/Microélectronique. Ecole Polytechnique X, 2010. Français. ⟨pastel-00543060v2⟩

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