1. Department of Physics, St. Peter’s Institute of Higher Education and Research, Chennai 600 054, Tamilnadu, India
2. Department of Physics, Aalim Muhammed Salegh College of Engineering, Chennai 600 055, Tamilnadu, India
3. Nanotechnology Research Centre (NRC), SRM Institute of Science and Technology, Kattankulathur 603 203, Chennai, India
4. Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur 603 203, Chennai, India
5. Program of Materials Science and Engineering, University of California San Diego, La Jolla, California 92093-0418, United States
6. Department of NanoEngineering and Program of Chemical Engineering, University of California San Diego, La Jolla, California 92093-0448, United States
7. Nanophotonics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, Tamilnadu, India
8. Department of Physics, Panimalar Engineering College, Chennai 600123, Tamilnadu, India
9. Department of Physics, College of Science, King Khalid University, Abha 61413, Saudi Arabia