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Theses

Guides d'ondes en verres de chalcogénures pour la détection infrarouge d'espèces (bio)chimiques

Abstract : Chalcogenide glasses are original materials with a large transparency window in the mid-infrared, high refractive index and low phonon energy. These properties allow them to be used as infrared sensors. My present work is about optical fibers and thin films development for sensors applications.

The development of thin films belonging to the Ge-(Ga)-Sb-S system, prepared by RF-sputtering or pulsed laser deposition, was described. High morphological and structural qualities of thin films were confirmed by SEM, AFM, Raman, near field, etc. Rib waveguides were produced by dry etching and their optical guiding characteristics were measured. These first results are promising for the future.

Optical fibers belonging to the Te-As-Se system were realized. The efficiency of these fibers for evanescent wave spectroscopy was demonstrated between 2 and 12 µm and validated thanks to numerous applications. In the field of the food safety, the goal was to detect pathogens in some food products and to differentiate them from each others. Discrimination was made possible thanks to statistical methods which take advantage of spectra. These statistical methods also highlight metabolic modifications in hepatic pathologies.

Chalcogenide glasses have proven to be useful for Surface Plasmonic Resonance (SPR). Prisms made of sulfide were realized and first results about specific detection of toxic molecules were obtained on the framework of a program led with Ifremer on sea food protection.
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https://tel.archives-ouvertes.fr/tel-00187065
Contributor : Marie-Laure Anne <>
Submitted on : Monday, November 26, 2007 - 4:02:13 PM
Last modification on : Friday, July 10, 2020 - 4:07:13 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 2:49:39 PM

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  • HAL Id : tel-00187065, version 2

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Marie-Laure Anne. Guides d'ondes en verres de chalcogénures pour la détection infrarouge d'espèces (bio)chimiques. Matériaux. Université Rennes 1, 2007. Français. ⟨tel-00187065v2⟩

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