1. College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea SA1 8EN, United Kingdom
2. Department of Electronics and Automation, Vocational School of Adana, Cukurova University, Adana, Cukurova 01160, Turkey
3. Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, Edgbaston B15 2TT, United Kingdom