1. Department of Physics; B. S. Abdur Rahman University; Chennai 600048 TN India
2. Mechanical & Industrial Engineering Department; Qatar University; P.O. Box 2713 Doha Qatar
3. Center for Advanced Materials; Qatar University; P.O. Box 2713 Doha Qatar
4. Department of Physics; Institute of Chemical Technology; Matunga Mumbai 400019 India
5. Department of Physics, School of Advanced Sciences; VIT University; Vellore 632014 TN India
6. Department of Physics; Vardhaman College of Engineering; Kacharam, Shamshabad 501218 Hyderabad, Telangana India