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Morphologie et auto-organisation de nanoparticules métalliques dispersées dans des matrices diélectriques : influence sur les propriétés optiques

Abstract : The aim of this work is to adjust the spectral position of the surface plasmon resonance of noble-metal nanoparticles embedded in a dielectric matrix by tailoring their morphology and their spatial organization. We show that when the growth is performed on plane substrates, it is possible to modify the aspect ratio of the particles H/D, and thus their optical response by changing the nature of the matrix. Quantitative structural analyzes carried out by using high angle annular dark field scanning transmission electronic microscopy (HAADF-STEM) imaging reveal that H/D is a decreasing function of the diameter D, independently of the deposited metal amount. In order to understand these effects of the matrix on the structural and optical properties of the particles, various studies (influence of the metal and deposited amount, presence of a buffer layer, influence of the elaboration conditions, covering rate of the particles, ...) are presented and numerical simulations of the optical spectra are proposed by integrating the structural parameters from the HAADF analysis in a model of Yamaguchi. A second step consists in using nanostructured sapphire surfaces in order to induce a surface organization of the particles, and thus to involve an anisotropy of their optical properties. We show that according to the geometry used during the deposition (normal incidence, grazing incidence, orientation and angle of incidence of atomic flux), it is possible to select the type of facets on which the growth takes place (shadowing effect) and consequently to elaborate self-organized systems of metal nanoislands constituted of stripes or linear chains of particles, whose optical properties display a light-polarization dependence.
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https://tel.archives-ouvertes.fr/tel-00331903
Contributor : David Lantiat <>
Submitted on : Monday, October 20, 2008 - 9:31:18 AM
Last modification on : Thursday, March 28, 2019 - 2:04:04 PM
Long-term archiving on: : Monday, June 7, 2010 - 8:46:56 PM

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  • HAL Id : tel-00331903, version 1

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David Lantiat. Morphologie et auto-organisation de nanoparticules métalliques dispersées dans des matrices diélectriques : influence sur les propriétés optiques. Matière Condensée [cond-mat]. Université de Poitiers, 2008. Français. ⟨tel-00331903⟩

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