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Spectroscopie optique de nano-objets individuels : effets d’environnement, de forme et d’orientation

Abstract : The optical response of metallic and semi-conductor nano-objects has been studied by spatial modulation spectroscopy (SMS), a technique allowing to detect single nano-objects and to quantitatively measure their extinction cross-sections. During my thesis, we have systematically correlated these optical measurements with the 2D or 3D characterization of their morphology, allowing a precise comparison of the measurements with numerical simulations. The first part of my PhD thesis describes a detailed study of the effect of the deposition of elongated nano-objects on an absorbing substrate. Our experiments show a spectral broadening of the surface plasmon resonance, whose extent highly depends on the shape and the encapsulation of the nano-objects. By combining SMS with a pump-probe approach, we were able to measure the ultrafast response of single gold nano-bipyramids. This response contains a contribution from several vibration modes, allowing extraction of their frequencies and damping times. In particular, we have addressed the effect of a dielectric encapsulation of bipyramids on their vibrational quality factors. During this thesis, we extended the use of SMS to very elongated nano-objects with a micrometric dimension (nanowires and nanotips), with the goal of studying their optical response, their interaction with a gold nanosphere and obtaining information on their absorption profile, as required to interpret electronic (field effect) or ionic (atom-probe tomography) emission experiments
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Etienne Pertreux. Spectroscopie optique de nano-objets individuels : effets d’environnement, de forme et d’orientation. Optique [physics.optics]. Université Claude Bernard - Lyon I, 2015. Français. ⟨NNT : 2015LYO10215⟩. ⟨tel-01355207⟩

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