1. Engineering Product Development, Singapore University of Technology and Design, Singapore487372, Singapore
2. Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology (Shenzhen), Shenzhen518055, People’s Republic of China
3. Department of Electrical and Computer Engineering, National University of Singapore, Singapore117583, Singapore
4. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore138634, Singapore