1. Photonics Research Centre, University of Malaya Kuala Lumpur, Malaysia
2. Physics Dept., Faculty of Science, University of Malaya Kuala Lumpur, Malaysia
3. Department of Physics, Faculty of Science and Technology, Airlangga University Campus C, Jl. Mulyorejo Surabaya (60115), Indonesia
4. Center of Advanced Optoelectronic Research CAPTOR, Department of Physics, Kulliyyah of Science, International Islamic University of Malaysia Kuantan, Malaysia