1. Department of Physics, Cochin University of Science and Technology, Kochi 682022, India
2. Department of Electrical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
3. International School of Photonics, Cochin University of Science and Technology, Kochi 682022, India
4. Centre of Excellence in Advanced Technology, Cochin University of Science and Technology, Kochi 682022, India
5. Inter University Centre for Nanomaterials and Devices, Cochin University of Science and Technology, Kochi 682022, India
6. NCPRE, Department of Electrical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India