1. Department of Physics, University of the Punjab, Lahore 54590, Pakistan
2. USPCAS-E, National University of Sciences and Technology (NUST), H-12, Islamabad 4400, Pakistan
3. SCME, National University of Sciences and Technology (NUST), H-12, Islamabad 4400, Pakistan
4. NUTECH School of Applied Science & Humanities, National University of Technology, Islamabad 44000, Pakistan