[Luo, Xiao-Qing; Fan, Bo; Yi, Huang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
[Fan, Bo] Soochow Univ, Sch Elect & Informat Engn, Suzhou 215006, Peoples R China.
[Bu, Feng] Suzhou Vocat Univ, Sch Elect Informat Engn, Suzhou 215104, Peoples R China.
[Chen, Fang; Chen, F] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Transducer Technol, Shanghai 200050, Peoples R China.
[Luo, Xiao-Qing] Univ South China, Hunan Prov Key Lab Ultrafast Micro Nano Technol, Adv Laser Manufacture, Hengyang 421001, Peoples R China.