1. Physics Department, Geethanjali College of Engineering and Technology, Hyderabad, Telangana, India;
2. Physics Department, Marri Laxman Reddy Institute of Technology and Management, Hyderabad, Telengana, India
3. Physics Department, Defence Metallurgical Research Laboratory, Hyderabad, Telangana, India
4. R & D Centre, Vardhaman College of Engineering, Hyderabad, Telangana, India