1. Lviv Polytechnic National University, Lviv, Ukraine
2. Institute for Physics of Microstructures of the Russian Academy of Sciences (IPM RAS), RF Nizhny Novgorod, Russia
3. Rzeszow University of Technology, Rzeszow, Poland
4. European University, Lviv Branch, Ukraine
5. Department of Molecular Physics, Lodz University of Technology, Lodz, Poland