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Fonctionnalisation de fibres optiques par des grenats pour les applications magnéto-optiques

Abstract : My Ph.D. thesis work is dedicated to the functionalization of an optical fiber with a bismuth substituted yttrium/iron garnet (Bi: YIG) for magneto-optic (MO) sensing applications, using the Faraday effects. During my research, I developed an original way to perform the synthesis of garnet microcrystal directly on the core of optical fiber by Metal-Organic Decomposition (MOD) method. I started with studying the MO and structural properties (XRD, SEM, AFM) of the material during the preparation process. The results showed a strong dependence of these properties on the temperature of annealing, duration time of the annealing and composition of the initial solution. This allowed me to refine the Bi: YIG synthesis and to find the optimal conditions to achieve the largest Faraday rotation. In addition, these studies gave me the possibility to determine the activation energy of Bi: YIG films crystallization, while calorimetric experiments (DSC, DTA) fail due to the presence of the substrate. Presently, I am able to prepare not only the garnet thin layers but also microcrystals with 2 3 μm size on the core of the optical fiber. I have developed an optical fiber sensor for magnetic measurement using this functionalized fiber. The obtained results showed that magnetic fields from 100 mT down to a few μT for such fibered MO sensor can be easily detected. Moreover, the used setup allows me to make measurements of the magnetic field based not only on Faraday rotation but Faraday ellipticity. And this fact gives the opportunity to significantly simplify the detection system and open new perspective ways in magnetic field measurements.
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Issatay Nadinov. Fonctionnalisation de fibres optiques par des grenats pour les applications magnéto-optiques. Physics [physics]. Université de Strasbourg, 2019. English. ⟨NNT : 2019STRAE051⟩. ⟨tel-03157296⟩

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