1. School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China
2. Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing College, University of Chinese Academy of Sciences, Chongqing 400714, P. R. China
3. College of Mechanical Engineering, Chongqing University, Chongqing 400714, P. R. China