1. State Key Laboratory of ASIC & System School of Information Science and TechnologyFudan University Shanghai 200433 China
2. State Key Laboratory of Transducer Technology and State Key Laboratory of Infrared PhysicsShanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China
3. University of Chinese Academy of SciencesChinese Academy of Sciences Beijing 100049 China
4. Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology Wuhan 430074 China