[1] Chinese Acad Sci, Natl Lab Infrared Phys, Shanghai Inst Tech Phys, Shanghai 200083, Peoples R China
[2] Univ Western Australia, Sch Elect Elect & Comp Engn, Crawley, WA 6009, Australia
[3] Luoyang Optoelect Inst, Luoyang 471009, Henan, Peoples R China