1. Department of Physics, CMR Institute of Technology, Medchal Road, Kandlakoya, Hyderabad, Telangana 501401, India
2. Optics Research Group, Department of Physics, University College of Science, Osmania University, No. 49, Hyderabad, Telangana 500007, India
3. Department of Physics, Keshav Memorial Institute of Technology, Narayanguda, Hyderabad, Telangana 500029, India