1. Physics Department, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences LUMS, Sector U, DHA, 54792 Lahore, Pakistan
2. School of Engineering, RMIT University Melbourne, Melbourne, Australia
3. School of Physics, The University of Melbourne, Melbourne, Australia
4. Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University Melbourne, Melbourne, Australia
5. Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology, Haripur, 22620, Haripur, Pakistan