Surface density enhancement of gold in silica film under laser irradiation at 355 nm

Jonnard, P.; Dufour, G.; Rullier, J. -L.; Morreeuw, J. -P.; Donohue, J. T.
July 2004
Applied Physics Letters;7/26/2004, Vol. 85 Issue 4, p591
Academic Journal
In order to understand the damage mechanisms inside the optics of the high power laser facilities, a model sample has been prepared by introducing gold nanoparticles into a silica film. The mean diameter of the gold clusters is 2.5 nm. Different parts of the sample were irradiated at wavelength 355 nm and fluences up to 1 J/cm2. By looking with x-ray photoelectron spectroscopy at the intensity of the Au 4f peak relative to that of the Si 2p peak, a surface Au density enrichment is observed. We interpret this as indicating that the gold atoms migrate toward the surface upon the laser irradiation.


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