1. Department of Physics, Krishnasamy College of Engineering and Technology, Cuddalore, Tamilnadu, India;
2. Associate Professor in the department of Physics, National Institute of Technology, Silchar, Assam, India;
3. Department of Physics, University College of Engineering, Panruti, Tamilnadu, India;
4. Department of Chemistry, Annamalai University, Chidambaram, Tamilnadu, India;
5. Division of Physics, School of Advance Science, VIT Chennai, Vandalur, Tamilnadu, India