1. P.G. & Research Department of Physics, AVVM Sri Pushpam College (Autonomous), Poondi, Thanjavur 613 503, Tamil Nadu, India
2. Department of Physics, Bharathidasan University Constituent College (Women), Orathanadu 614 625, Tamil Nadu, India
3. Department of Nanotechnology, Noorul Islam Centre for Higher Education, Kumaracoil 629 180, Tamil Nadu, India
4. Department of Physics, Noorul Islam Centre for Higher Education, Kumaracoil 629 180, Tamil Nadu, India
5. CUER – UL, Université de Lomé, BP: 1515, Lomé, Togo
6. Department of Physics, RKM Vivekananda College (Autonomous), Chennai , Tamil Nadu, India