Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5352503 | Applied Surface Science | 2016 | 5 Pages |
Abstract
In this study, laser induced periodic surface structures were formed on mesoporous silicon by irradiation of Nd:YAG picosecond pulsed laser beam at 266Â nm wavelength at 1Â Hz repetition rate and with 42Â ps pulse duration. The effects of laser processing parameters as laser beam fluence and laser pulse number on the formation of ripples were investigated. Scanning electron microscopy and atomic force microscopy were used to image the surface morphologies and the cross section of samples after laser irradiation. At relatively low fluence â¼20Â mJ/cm2, ripples with period close to the laser beam wavelength (266Â nm) and with an always controlled orientation (perpendicular to the polarization of ps laser beam) appeared after a large laser pulse number of 12,000. It has been found that an initial random distribution of SiOx nanoparticles is periodically structured with an increase of the laser pulse number. Finally, it is experimentally demonstrated that we formed a 100Â nm liquid phase under the protusion zones including the pores in the picosecond regime.
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Authors
A. Talbi, A. Petit, A. Melhem, A. Stolz, C. Boulmer-Leborgne, G. Gautier, T. Defforge, N. Semmar,