[1] Nankai Univ, Minist Educ China, Key Lab Opt Informat Sci & Technol, Inst Modern Opt, Tianjin 300071, Peoples R China
[2] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, Merseyside, England
[3] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[4] Nankai Univ, Affiliated Hosp, Tianjin 300121, Peoples R China
[5] Shenzhen Univ, Coll Optoelect Engn, Inst Micro & Nano Opt, Shenzhen 518060, Peoples R China