1. School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
2. Academy of Scientific and Innovative Research, CSIR-HRDC Campus, Ghaziabad 201002, Uttar Pradesh, India
3. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India
4. RMIT Microscopy and Microanalysis Facility, RMIT University, Melbourne 3000, Australia
5. Optical Sciences Centre, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
6. Micro Nano Research Facility, RMIT University, Melbourne 3000, Australia