1. College of Physics, Changchun University of Science and Technology, Changchun, Jilin Province 130013, China
2. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin Province 130012, China
3. School of Electronic Engineering, Changchun College of Electronic Technology, Changchun, Jilin Province 130114, China