1. a Department of Physics , Manipur University , Imphal, 795003, India
2. b Department of Physics , GVM Girls College , Sonepat, 131001, India
3. c Department of Physics , Hindu College , Sonepat, 131001, India
4. d National Physical Laboratory , New Delhi, 110012, India
5. e Directorate of ER & IPR , DRDO Bhawan, Rajaji Marg, New Delhi, 110 105, India