1. Wuhan National Laboratory for Optoelectronics
2. School of Optical and Electronic Information
3. Huazhong University of Science and Technology
4. Wuhan 430074
5. P. R. China
6. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
7. Wuhan University of Technology
8. Wuhan 430070
9. School of Physics & Optoelectronic Engineering
10. Nanjing University of Information Science & Technology
11. Nanjing 210044