1. Institute of Physics—Center for Science and Education, Silesian University of Technology 1 , 44-100 Gliwice, Poland
2. Institute for Technical Energy Systems (ITES), Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts 2 , 33619 Bielefeld, Germany
3. Bielefeld University, Faculty of Physics 3 , 33615 Bielefeld, Germany