1. Department of Physics, SSM Institute of Engineering and Technology, Dindigul, Tamil Nadu, India
2. Faculty of Physics, Mahalingam College of Engineering and Technology, Pollachi, Tamil Nadu, India
3. Department of Physics, Gandhigram Rural Institute, Gandhigram, Tamil Nadu, India
4. Department of Physics, Raja Duraisingam Government Arts College, Sivagangai, Tamilnadu, India