1. Institute of Microelectronics and Optoelectronics; Warsaw University of Technology; Koszykowa 75 Warsaw 00-662 Poland
2. Institute of Materials Science and Engineering; Lodz University of Technology; Stefanowskiego 1/15 Lodz 90-924 Poland
3. Institute of Physics; Polish Academy of Sciences; Al. Lotnikow 32/46 Warsaw 02-666 Poland
4. Centre de Recherche en Photonique; Université du Québec en Outaouais; 101 rue Saint-Jean-Bosco Gatineau QC J8X3X7 Canada