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Author Girardeau, T. ♦ Camelio, S. ♦ Traverse, A. ♦ Lignou, F. ♦ Allain, J. ♦ Naudon, A. ♦ Guerin, Ph.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ CERMETS ♦ ELLIPSOMETRY ♦ ION BEAMS ♦ MESONS ♦ MORPHOLOGY ♦ OPTICAL PROPERTIES ♦ PHYSICS ♦ PLASMONS ♦ SPECTROSCOPY ♦ THIN FILMS
Abstract Ion beam sputtering codeposition has been used to elaborate ceramic----metal (cermet) composite thin films consisting of copper nanoclusters embedded in an amorphous Si{sub 3}N{sub 4} matrix. As prepared, the clusters have a size smaller than 3 nm and postirradiation by high energetic Ar{sup +} ions leads to an homogenization of the clusters' morphology and an increase of the clusters' size to an average diameter of 4.5 nm. This work deals with the relation between the morphology of the clusters, characterized by extended x-ray absorption fine spectroscopy and grazing incidence small angle x-ray scattering, and the optical properties (obtained by spectroscopic ellipsometry) of the cermets, which are classically modeled with the help of the effective medium theory. In the case of the as-prepared sample, the Bruggeman effective medium theory has been successfully used. This comes from the fact that the clusters are sufficiently close to each other to create mutual interactions. On the other hand, the morphology of the postirradiated film is in agreement with the hypothesis made by the Maxwell--Garnett effective medium theory, and a resonance peak appears due to the surface plasmon excitation whose position depends on the cluster size. {copyright} 2001 American Institute of Physics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 90
Issue Number 4


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