1. School of Studies in Physics and Astrophysics; Pt. Ravishankar Shukla University; Raipur 492010 (C.G.) India
2. Department of Electrical and Electronics Engineering; Chhatrapati Shivaji Institute of Technology; Shivaji Nagar Kolihapuri Durg 491001 (C.G.) India
3. Department of Applied Physics; Raipur Institute of Technology; Chhatauna, Mandir Hasuad Raipur 492101 (C.G.) India