1. Faculty of Electromechanical Engineering
2. Guilin University of Electronic Technology
3. 541004 Guilin
4. China
5. Key Laboratory of Optoelectronic Technology & Systems
6. Education Ministry of China
7. Chongqing University, and College of Opto-electronic Engineering
8. Chongqing University
9. 400044 Chongqing
10. Institute of Optoelectronics & Nanomaterials
11. College of Materials Science and Engineering
12. Nanjing University of Science and Technology
13. Nanjing 210094
14. Institute of Microelectronics
15. Tsinghua University
16. 100084 Beijing