1. Nanophotonics and Plasmonics Laboratory, School of Basic Sciences, Indian Institute of Technology, Bhubaneswar, Odisha 752050, India
2. Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulthar, Tamil Nadu 603203, India
3. School of Physics, University of Hyderabad, Hyderabad, Telangana 500046, India