1. Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia
2. Innovation Centre of the Faculty of Technology and Metallurgy, Belgrade, Serbia
3. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary
4. Department of Physics, Kent State University, Kent, OH, USA
5. Chemical Physics Interdisciplinary Program, Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH, USA