Dissymmetrization of Microparticle Surface by Laser-Induced Photochemical Deposition

We investigate the surface dissymmetrization of micro-sized particles by using the photochemical reduction of chromate ions induced by a strongly focused continuous Ar laser wave to nucleate and grow deposits onto one hemisphere of silica beads dispersed in the chromate solution. Growth of dissymmetric coatings is performed at nm 514 = λ with laser fluences varying from to 3 . 1 2 10.1 kW cm . Rescaling of the measured deposit growth laws reduces to a single master behavior predicting the desired dissymmetry. The technique can be used to tailor micro-scale dissymmetric patterns by scanning the beam. PACS numbers: 81.15.Fg, 81.10.Dn, 42.40.Eq, 42.70.Gi 1 ha l-0 00 94 74 5, v er si on 1 15 M ay 2 00 9 Author manuscript, published in "Applied Surface Science 248, 1-4 (2005) 470-474" DOI : 10.1016/j.apsusc.2005.03.066 Ms# L-4034 Revised Version 4-ICPEPA, Lecce Italy 5-9 September 2004 2