1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 20083, People's Republic of China
2. Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, People's Republic of China
3. School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, People's Republic of China