Caractérisation par cathodoluminescence des défauts ponctuels dans les matériaux à base de silice : fibres optiques et nanoparticules

Abstract : The recent use of silica-based optical fibers (OFs) in harsh environments pushed the researchers to accelerate their vulnerability and hardening studies. Such challenges are strongly linked to the good understanding of the macroscopic as well as the microscopic effects of different types of radiations on the silica-based OF's response. This PhD thesis presents a complementary study to previous researches on the properties of different point defects in silica-based OFs by Cathodoluminescence (CL). Such technique offers the ability to both detect the luminescent centers and to follow their spatial distribution, their growth and decay kinetic as a function of the electron beam characteristics. ln the present manuscript we first summarize the current knowledge regarding point defects in pure silica or silica glass doped with Ge, P, Ce, N or Al. Details of the experimental procedure are discussed in the 2nd chapter in which we highlight that the equivalent dose deposited during the various configuration of CL measurements are very large. ln the 3rd chapter, we perform an overview study of the CL responses of different classes of OFs, in which many emission bands related to the different dopants were discussed. The 4th chapter focuses on the study of the effects of varying beam conditions on the signature of Germanium Lone Pair Center (GLPC), one of the most important Ge-related point defects. Finally, in chapter V, we demonstrate the possibility to produce silica-based nanoparticles by laser ablation process, and the ability of the CL technique to characterize such materials, which opens the door to other employments of this technique for future studies on nanoparticles.
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Submitted on : Monday, September 23, 2019 - 4:46:20 PM
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Imene Reghioua. Caractérisation par cathodoluminescence des défauts ponctuels dans les matériaux à base de silice : fibres optiques et nanoparticules. Optique / photonique. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSES002⟩. ⟨tel-02292892v2⟩

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