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Propriétés optiques de nanoparticules uniques de métaux nobles

Abstract : In the range of nanometric sizes, the optical properties of single gold and silver particles are those of the massive solid modified by dielectric confinment: in particular Surface Plasmon Resonances. The light-nanoparticle interaction being very weak, the study of a single particle could be carried out thanks to the development of an original optical technique in far field based on the spatial modulation of the sample. This technique allowed the detection and the geometrical optical characterization of single nanoparticles of approximately 10 nm diameter, using laser sources or a conitnuum. The use of a white lamp and a Near UltraViolet - visible - Near InfraRed setup allowed the study of larger particles and thus of the quadrupolar mode of the plasmon as well as the analysis of published values of the dielectric functions of noble metals. The study of particles according to their size made it possible to check the changeover to the quasi-static mode of collective oscillation of the conduction electrons. The correlation of the optical measurements to transmission electron microscopy showed the influence of the form and the interactions between particles on this optical response.
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Contributor : Pierre Billaud <>
Submitted on : Wednesday, January 23, 2008 - 9:30:00 AM
Last modification on : Monday, October 19, 2020 - 10:54:14 AM
Long-term archiving on: : Thursday, April 15, 2010 - 12:17:42 PM


  • HAL Id : tel-00213213, version 1



Pierre Billaud. Propriétés optiques de nanoparticules uniques de métaux nobles. Physique [physics]. Université Claude Bernard - Lyon I, 2006. Français. ⟨tel-00213213⟩



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