[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[2] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect & Sport & Hlth Initiat, Opt Valley Lab, Wuhan 430074, Peoples R China
[3] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
[4] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
[5] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore