1. State Key Laboratory of High Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, China
2. Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education School of Physics and Technology, Wuhan University, Wuhan 430072, China
3. Key Laboratory for Micro/Nano-Optoelectronic Devices of Ministry of Education School of Physics and Electronics, Hunan University, Changsha 410082, China
4. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China