1. Key Laboratory of Terahertz Solid‐State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences865 Changning RoadShanghai200050People's Republic of China
2. Center of Materials Science and Optoelectronics Engineering, University of the Chinese Academy of SciencesBeijing100049People's Republic of China
3. School of Optical‐Electrical and Computer Engineering, University of Shanghai for Science and TechnologyShanghai200093People's Republic of China