[1] Univ Valencia, Dept Opt, C Dr Moliner 50, E-46100 Burjassot, Spain
[2] Univ Alicante, Dept Opt Pharmacol & Anat, Alicante, Spain
[3] Univ Belgrade, Ctr Microelec Technol & Single Crystals, Inst Chem Technol & Met, Belgrade 11000, Serbia
[4] Texas A &M Univ Qatar, Doha, Qatar