1. Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE1410, Brunei
2. Department of Electronic Engineering, Chien Hsin University of Science and Technology, No. 229, Jianxing Rd., Zhongli City, Taoyuan County 32097, Taiwan
3. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu, Taiwan
4. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202, Taiwan