Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 418, 5 February 2013, Pages 47-51.
M. Ulmeanu, I. Anghel, M. Filipescu, C. Luculescu, M. Enculescu, M. Zamfirescu.
Laser Department, National Institute for Laser, Plasma and Radiation Physics, Atomistilor Str. 409, P. O. Box MG-36, 077125 Magurele-Bucharest, Romania
University of Bucharest, Faculty of Physics, Atomistilor Str. 405, P. O. Box MG-11, 077125 Magurele-Bucharest, Romania
National Institute of Material Physics, Atomistilor Str. 105 bis, P.O. Box MG-7, 077125 Magurele-Bucharest, Romania
Abstract
A simple approach to fabricate periodic arrays of ring bumps, disk and convex bumps or holes on silicon and gallium arsenide substrates is reported. In the process, a mono or double layer of 700 nm diameter silica colloidal particles were self-assembled on the substrates and a single pulse from a 200 fs laser at 387 nm wavelength was applied. The surfaces were irradiated at normal incidence by immersing the substrates in a glass container filled with acetone, carbon tetrachloride and 1,1,2-trichlor-trifluorethan liquid precursors. The influence of the medium on the near-field interactions for both substrates is investigated.
