1. Research Scholar, Department of Physics and Research Centre Nesamony Memorial Christian College Marthandam Kanyakumari Tamil Nadu 629165 India
2. Affiliated to Manonmanium Sundaranar University Abishekapatti Tirunelveli Tamil Nadu 627012 India
3. Department of Physics and Research Centre Nesamony Memorial Christian College Marthandam Kanyakumari Tamil Nadu 629165 India
4. Division of Physics School of Advanced Sciences Vellore Institute of Technology Chennai 600127 India