1. Department of Physics and Electronics, Kristu Jayanti College (Autonomous), Bangalore 560077, India
2. New Technologies - Research Center, University of West Bohemia, Plzen̆ 30100, Czech Republic
3. Department of Physics, School of Engineering, Presidency University, Bangalore 560064, India
4. Department of Physics, OP Jindal University, Raigarh, Chhattisgarh 496109, India