1. Department of Physics, KLE Technological University, Hubli 580031, Karnataka, India
2. Department of Physics, M S Ramaiah Institute of Technology, Bangalore 560054, Karnataka, India
3. Department of Chemistry, RV College of Engineering, Bangalore 560059, Karnataka, India
4. Department of Biotechnology, KLE Technological University, Hubli 580031, Karnataka, India
5. Department of Physics, B V B College of Engineering and Technology, Hubli 580031, Karnataka, India