1. Department of Physics, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 4, , Novi Sad 21000, Serbia
2. Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, Novi Sad 21000, Serbia
3. Institute of Photonics and Electronics of the Czech Academy of Sciences, Chaberka 1014/57, Prague 18251, Czech Republic