1. Department of Physics, Bilkent University, 06800, Ankara Turkey
2. Department of Photonics, Izmir Institute of Technology, 35430 Izmir, Turkey
3. Department of Biological Engineering, Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307, United States,
4. Department of Chemistry, Bilkent University, 06800, Ankara Turkey
5. School of Materials and National Graphene Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom