1. Department of Atomic and Molecular Physics, Manipal Academy of Higher Education, Manipal 576104, India
2. CAPPA, Irish Photonic Integration Centre, Tyndall National Institute, Lee Maltings, Dyke Parade, T12P928 Cork, Ireland
3. Centre for Applied Nanoscience, Department of Atomic and Molecular Physics, Manipal Academy of Higher Education, Manipal 576104, India
4. Centre of Excellence for Biophotonics, Department of Atomic and Molecular Physics, Manipal Academy of Higher Education, Manipal 576104, India