1. Department of Physics, Bharata Mata College, Kochi, Kerala, India
2. International School of Photonics, Cochin University of Science and Technology, Kochi, Kerala, India
3. Department of Physics, St. Aloysius College, Edathua, Alappuzha, Kerala, India
4. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala, India