1. College of Physics, Qingdao University, Qingdao 266071, China
2. National Demonstration Center for Experiment Applied Physics Education, Qingdao University, Qingdao 266071, China
3. College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao 266071, China
4. Weihai Innovation Research Institute of Qingdao University, Weihai 264200, China