1. Department of Physics, VHNSN College, Virudhunagar – 626001, Tamilnadu, India
2. Department of Physics, SACS MAVMM Engineering College, Madurai – 625301, Tamilnadu, India
3. Department of Physics, Gandhigram Rural University, Gandhigram – 624302, Tamilnadu, India
4. Department of Physics, Madurai Kamaraj University College, Madurai – 625002, Tamilnadu, India