1. Department of Physics College of Information Science and Engineering Ocean University of China Qingdao 266100 China
2. College of Physics Qingdao University Qingdao 266071 China
3. Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hong Kong SAR China
4. Industrial Research Institute of Nonwovens and Technical Textiles Qingdao University Qingdao 266071 China
5. State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China