1. Department of Physics, COMSATS Universiti Islamabad, Lahore, Pakistan
2. Optical Fibre Sensors Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
3. School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Malaysia
4. Photonics Research Centre, University of Malaya, Kuala Lumpur, Malaysia
5. Department of Physics, Kulliyyah of Science, International Islamic University Malaysia, Kuantan, Malaysia