1. a Department of Physics , Kielce University of Technology , Aleja Tysia¸clecia Państwa Polskiego 7, Kielce , PL , 25-314 , Poland
2. b Department of Telecommunication and Photonics , Kielce University of Technology , Aleja Tysia¸clecia Państwa Polskiego 7, Kielce , PL , 25-314 , Poland
3. c Technology Institute of Science in Skarżysko-Kamienna , Poland