1. Department of Physics, Abdul Kalam Research Center, Sacred Heart College, Tirupattur, Tamilnadu - 635601, India
2. Department of Physics, Kings Engineering College, Sriperumbudur, Chennai, Tamilnadu - 602117, India
3. Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamilnadu - 603203, India
4. Nanotechnology Research Center (NRC), SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamilnadu - 603203, India