1. Photonics Research Centre, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Physics, University of Malaya, Kuala Lumpur, Malaysia
3. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, Indonesia
4. Centre of Advanced Optoelectronics Research (CAPTOR), Physics Department, Kulliyyah of Science, International Islamic University Malaysia, Kuantan, Malaysia