1. Department of Engineering Physics, Andhra University College of Engineering (A), Andhra University, Visakhapatnam, Andhra Pradesh, India;
2. Advanced Functional Materials Laboratory, IIT – Hyderabad, Sangareddy, Telangana State, India;
3. Rajiv Gandhi University of Knowledge Technologies, IIIT – Idupulapaya, Kadapa, Andhra Pradesh, India