Nanoparticules semi-conductrices et plasmoniques comme sondes locales de l’environnement diélectrique

Abstract : Probing systems using luminescent nanoparticles requires the understanding of all the processes that influence the luminescence properties. This thesis focuses on the influence of the dielectric environment on the luminescence of two types of nanoparticles : (i) colloidal quantum dots (QDs), and (ii) gold nanorods. The aim of this work is to evaluate the potential of these nanostructures to act as local probes of the dielectric environment. The evolution of the relaxation dynamics of QDs in various dielectric media is interpreted in terms of local effective refractive index. This work shows that a detailed analysis of the sensitivity of the QDs to the environment allows their use as biological nanoprobes of refractive index. We furthermore present a new method for the encapsulation of QDs in a solid dielectric matrix, using pulsed laser deposition. The emitters can be incorporated in thin films and their local environment can be modified in a reversible and non-destructive way, while the emission dynamics is investigated at the single emitter level. Finally, the sensitivity of the surface plasmon resonance of gold nanorods to an approching dielectric interface is also studied, and compared to the one found for QDs
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Antoine Aubret. Nanoparticules semi-conductrices et plasmoniques comme sondes locales de l’environnement diélectrique. Optique [physics.optics]. Université Claude Bernard - Lyon I, 2015. Français. ⟨NNT : 2015LYO10202⟩. ⟨tel-01313322⟩

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