1. College of Physics and Optoelectronic Engineering
2. Shenzhen University
3. Shenzhen 518060
4. P. R. China
5. Institute of Microscale Optoelectronics
6. State Key Laboratory of Functional Materials for Informatics
7. Shanghai Institute of Microsystem and Information Technology
8. Chinese Academy of Sciences
9. Shanghai 200050
10. College of Materials Science and Engineering
11. Hunan University
12. Changsha 410082