1. Department of Physics, Andhra University, Visakhapatnam, Andhra Pradesh, India
2. Department of Physics, Anil Neerukonda Institute of Technology and Sciences (A), Visakhapatnam, India
3. Department of Physics, Centurion University of Technology and Management, Vizianagaram, Andhra Pradesh, India
4. Aditya College of Engineering and Technology, Surampalem, Andhra Pradesh, India