[1] Sun Yat Sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Foshan Res Inst, Foshan 528222, Guangdong, Peoples R China
[3] Shenzhen Inst Informat Technol, Dept Elect Commun & Technol, Shenzhen 518172, Guangdong, Peoples R China