1. Department of Applied Physics, Bhilai Institute of Technology (Seth Balkrishan Memorial)Near Bhilai HouseDurgChhattisgarh 491001India
2. School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla UniversityRaipurChhattisgarh 492010India
3. Department of Electronics & Telecommunication, Bhilai Institute of Technology (Seth Balkrishan Memorial)Near Bhilai HouseDurgChhattisgarh 491001India