1. Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory (CSIR-NPL) Campus, New Delhi 110012, India
2. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
3. Department of Applied Physics, Amity Institute of Applied Sciences, Amity University, Noida, Uttar Pradesh 201313, India
4. Physics Department, Deshbandhu College, University of Delhi, Kalkaji, New Delhi 110019, India