1. Institute of Scientific Instruments of CAS, Czech Academy of Sciences, Královopolská 147, 61264 Brno, Czech Republic
2. Department of Physics, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
3. Department of Electrical and Electronics Engineering, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey