1. Materials Science Laboratory, Department of Applied Physics, Giani Zail Singh Campus College of Engineering and Technology, Maharaja Ranjit Singh Punjab Technical University, Bathinda, Punjab, India;
2. Inder Kumar Gujral Punjab Technical University Kapurthala, Punjab, India;
3. Yadavindra College of Engineering (YCoE), Punjabi University Guru Kashi Campus, Talwandi Sabo, Punjab, India;
4. Punjabi University Guru Kashi College Damdama Sahib, Talwandi Sabo, Punjab, India;
5. Department of Physics, S.G.R.R. (P.G) College, Dehradun, Uttarakhand, India;
6. Mata Sahib Kaur Girls College (affiliated to Punjabi University Patiala), Talwandi Sabo, Punjab, India