[Deng, Zhixiang; Wang, Xinlin] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
[Liu, Jun] Shenzhen Univ, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.
[Liu, Jun] Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.
[Huang, Xianwei] Hunan Univ, Coll Comp Sci & Elect Engn, Changsha 410082, Hunan, Peoples R China.
[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Lab Micro Nanooptoelect Devices,Minist Educ, Changsha 410082, Hunan, Peoples R China.