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Etude expérimentale et théorique des propriétés optiques de nanocomposites plasmoniques fabriqués par irradiation laser et sous flux solaire concentré

Abstract : This dissertation deals with the study of plasmonic nanocomposites and, more precisely, polymer thin films loaded with gold and silver nanoparticles. In this work, we developed two original fabrication techniques based on in situ synthesis of nanoparticles in polymer films under irradiation. In the first approach, our aim is to control the organization of the nanoparticles within the polymer films by using a spatially controlled irradiation by laser interferometry. We show that the plasmonic nanoparticle gratings thus formed present unusual diffractive properties that strongly depend on the plasmonic features of the system. We call this phenomena plasmon enhanced diffraction. In a second method, we study in situ synthesis of nanoparticles in polymer thin films under concentrated solar irradiation. This study is focused on the effect of concentrated solar irradiation on the growth mechanism and the morphology of the nanostructures. We have shown that it is possible to control the size of the gold nanoparticles synthesized in situ by varying the solar flux. Along with experiments, we developed a semi-analytical approach that combines modeling of the materials as effective media with the RCWA method (Rigorous Coupled Wave Analysis), which allows us to compute the optical properties of the nanocomposites.
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Submitted on : Monday, January 15, 2018 - 10:26:08 AM
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Elie Nadal. Etude expérimentale et théorique des propriétés optiques de nanocomposites plasmoniques fabriqués par irradiation laser et sous flux solaire concentré. Physique [physics]. Université de Perpignan, 2017. Français. ⟨NNT : 2017PERP0029⟩. ⟨tel-01681353v2⟩

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