1. Polymers and Pigments Department, National Research Center, 12622 Cairo, Egypt
2. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3. Department of Metallurgical and Materials Engineering, Iskenderun Technical University, 31200 Hatay, Turkey
4. Department of Physics, University of California Davis, Davis, California 95616, USA
5. Department of Metallurgical and Materials Engineering, Gazi University, 06500 Ankara, Turkey
6. The Skoltech Center of Photonics and Quantum Materials (CPQM), Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
7. Department of Physics, King Fahd University, Dhahran 34463, Saudi Arabia