1. Department of Physics; COMSATS Institute of Information Technology; Lahore 54000 Pakistan
2. Interdisciplinary Research Centre in Biomedical Materials; COMSATS Institute of Information Technology; Lahore 54000 Pakistan
3. ISIT, H-11/4; Islamabad Pakistan
4. College of Science; Physics and Astronomy Department; King Saud University; P.O. Box 800 11421 Riyadh Saudi Arabia