Affiliation: | a Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland b Institute of Applied Optics, Kamionkowska 18, 03-805 Warsaw, Poland c Institute of Electronic Materials Technology, Wólczynska 133, 01-919 Warsaw, Poland d Departamento de Fisica, Universidad de Antioquia, Apartado aereo 1226, Medellin, Colombia |