1. Department of Electrical-Electronic Engineering, Kastamonu University, Kastamonu, Turkey
2. Department of Electrical and Electronics Engineering, Antalya Bilim University, Antalya, Turkey
3. Department of Physics, Faculty of Sciences, Gazi University, Ankara, Turkey
4. Department of Computer Engineering, Istanbul Ticaret University, Istanbul, Turkey
5. Nanotechnology Research Center and the Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey