1. College of Electronics and Information, Qingdao University, Qingdao, China
2. School of Physics and Electronics, Hunan University, Changsha, China
3. School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, AZ, USA
4. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, China
5. Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, Guangxi University, Nanning, Guangxi, China
6. Institute of Physics, Henan Academy of Sciences, Zhengzhou, China