1. Faculty of Science, Physics Department, Dokuz Eylül University, Tınaztepe Campus, 35390 İzmir, Turkey
2. Department of Physics, Adnan Menderes University, Aydın 09010, Turkey
3. Department of Physics, University of Maryland–Baltimore County, Baltimore, Maryland 21250, USA
4. Department of Electrical and Electronic Engineering, Adnan Menderes University, 09100 Aydın, Turkey
5. Nanotechnology Application and Research Center, Adnan Menderes University, Aydın 09010, Turkey