[1] Warsaw Univ Technol, Inst Microelect & Optoelect, PL-00661 Warsaw, Poland
[2] Warsaw Univ Technol, Inst Radioelect & Multimedia Technol, PL-00661 Warsaw, Poland
[3] Topsil Semicond Mat AS, DK-3600 Frederikssund, Denmark
[4] Cent Off Measures, PL-00139 Warsaw, Poland