1. Institut Lumière Matière UMR 5306
2. Université Claude Bernard Lyon 1
3. F-69100 Villeurbanne
4. France
5. International and Inter University Centre for Nanoscience and Nanotechnology Mahatma Gandhi University
6. Kottayam 686560
7. India
8. School of Pure and Applied Physics
9. Mahatma Gandhi University