1. Department of Optoelectronics Science Harbin Institute of Technology Weihai 264209 China
2. College of Physics and Electronic Engineering Zhengzhou University of Light Industry Zhengzhou 450001 China
3. School of Physics Harbin Institute of Technology Harbin 150001 China
4. School of Physics Zhengzhou University Zhengzhou 450001 China
5. Department of Physics Fuzhou University Fuzhou 350002 China