1. Department of Applied Science, Institute of Engineering and Technology, Dr. Ram Manohar Lohia Awadh University, Ayodhya-224001, U.P., India.
2. Department of Physics, Babasaheb Bhimrao Ambedkar University, Lucknow-226025, U.P, India.
3. Department of Applied Sciences and Humanities, Institute of Engineering and Technology, Lucknow-226021, U.P., India.
4. Department of Physics, Zakir Husain Delhi College, University of Delhi, Delhi-110002, India.