1. School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, PR China
2. Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
3. College of Physics and Optoelectronic Technology, Nonlinear Research Institute, Baoji University of Arts and Sciences, Baoji 721016, PR China
4. School of Systems Science, Beijing Normal University, Beijing 100875, PR China
5. School of Microelectronics, Xidian University, Xi'an 710071, PR China