1. Key Laboratory for Photonic and Electronic Bandgap Materials
2. Ministry of Education
3. School of Physics and Electronic Engineering
4. Harbin Normal University
5. Harbin 150025, P. R. China
6. State Key Laboratory on Integrated Optoelectronics Jilin University Region
7. College of Electronic Science and Engineering
8. Jilin University
9. Changchun 130012, P. R. China