1. Department of Applied Physics; Shri Shankaracharya Technical Campus; Bhilai Chhattisgarh 490020 India
2. School of Studies in Physics & Astrophysics; Pt. Ravishankar Shukla University; Raipur Chhattisgarh 492010 India
3. Bharti College of Engineering & Technology; Durg Chhattisgarh 491001 India