1. Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
2. Department of Physics, Faculty of Applied Science, Taiz University, Taiz P.O. Box 6803, Yemen
3. Institut Islam Hadhari, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
4. College of Engineering, Universiti Tenaga Nasional (UNITEN), Kajang 43000, Malaysia