1. Department of Physics, Auxilium College, Vellore 632007, India
2. Department of Physics, Sacred Heart College, Tirupattur 635601, India
3. Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
4. Division of Optics, FZU Institute of Physics, Prague 18200, Czech Republic
5. Department of Physics, School of Advanced Sciences, VIT, Vellore 632014, India
6. School of Electronics Engineering, VIT, Vellore 632014, India