1. Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, (UKM), Bangi, Malaysia
2. Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), Bangi, Malaysia
3. Pusat Pengajian Citra Universiti, Universiti Kebangsaan Malaysia (UKM), Bangi, Malaysia