1. Department of Physics, University of Lahore, Gujrat, Pakistan
2. Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Selangor, Malaysia
3. Department of Technical Education, CET, University of Sargodha, Sargodha, Pakistan
4. Department of Physics, Faculty of Sciences, University of Gujrat, Gujrat, Pakistan