1. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083, P. R. China
2. University of Chinese Academy of Sciences, 19 Yu Quan Road, Beijing 100049, P. R. China
3. Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-Lane Xiangshan, Hangzhou 310024, P. R. China
4. Key Laboratory of Space Active Optoelectronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083, P. R. China
5. Institute of Optoelectronics, Fudan University, 2005 Songhu Road, Shanghai 200438, P. R. China