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Contribution à l'étude théorique, numérique et expérimentale des nanoantennes patch optiques

Abstract : In the field of biosensors, efficient absorption of the electromagnetic field in a confined space is essential. The use of metallic nanoparticules comparable to metamaterials is the best way, to date, to amplify the field. In fact, by placing a dielectric film between a metal substrate and these particules, we allow the propagation of a gap-plasmon under these particules. This locates the magnetic field under these particules and the electric field on the edges of these nanoparticules. The resonances of this system are very sensitive to the environment of the gap-plasmon which allows very precise analysis. Although we can explain where these resonances come from, the efficiency to absorb of these structures remains poorly understood. The interferometric control is a response to this efficiency. In this report, I show that interferometric modeling of this system can fully explain the absorption. Indeed, the interferometric control well explains the presence of resonances at specific wavelenghts or the appearance of resonances when the angle of incidence is not normal. This study is very important to understand and master biosensors. In addition, this model can explain the amplification of the field in these structures and will allow us to provide the resonances of a system in various environments.
Keywords : Nanoparticles
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Caroline Lemaître. Contribution à l'étude théorique, numérique et expérimentale des nanoantennes patch optiques. Physique [physics]. Université Blaise Pascal - Clermont-Ferrand II, 2016. Français. ⟨NNT : 2016CLF22742⟩. ⟨tel-01980621⟩

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