1. Lviv Polytechnic National University 12 Bandera st. Lviv 79013 Ukraine
2. Scientific Research Company “Electron‐Carat” 202 Stryjska st. Lviv 79031 Ukraine
3. Institute of Physics of Polish Academy of Sciences 32/46 Al. Lotników Warsaw 02–668 Poland
4. Institute of Fundamental Technological Research of Polish Academy of Science 5B Pawinskiego st. Warsaw 02–106 Poland
5. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine 3b Naukova st. Lviv 79060 Ukraine