1. Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Guwahati-781035, Assam, India
2. Department of Electronics and Communication Technology, Gauhati University, Guwahati-781014, Assam, India
3. Department of Electronics and Communication Engineering, National Institute of Technology Mizoram, Aizawl-796012, India
4. Department of Chemistry, Gauhati University, Guwahati-781014, Assam, India