1. State Key Laboratory of High Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, China
2. Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR 999078, China
3. Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
4. School of Semiconductor Science and Technology, South China Normal University, Foshan 528000, China