1. Institute of Semiconductors Chinese Academy of Science Beijing 100083 China
2. Electrical Engineering Department University at Buffalo The State University of New York Buffalo NY 14260 USA
3. Department of Mechanical and Aerospace Engineering University at Buffalo The State University of New York Buffalo NY 14260 USA
4. Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 23955 Saudi Arabia
5. State Key Laboratory on Tunable laser Technology Ministry of Industry and Information Technology Key Lab of Micro‐Nano Optoelectronic Information System Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518057 China