1. Department of Applied Physics, College of Science, Zhejiang University of Technology, Hangzhou 310058, China
2. Center for Optics & Optoelectronics Research (COOR), Collaborative Innovation Center for Information Technology in Biological and Medical Physics, College of Science, Zhejiang University of Technology, Hangzhou 310058, China
3. Department of Physics, Zhejiang University, Hangzhou 310015, China