1. College of Physics and Materials Science; Tianjin Normal University; Tianjin 300387 China
2. Institute of Information Optics; Zhejiang Normal University; Jinhua Zhejiang 321004 China
3. Department of Physics and Engineering Physics; The University of Tulsa; Tulsa Oklahoma 74104
4. Department of Mechanical and Biomedical Engineering; City University of Hong Kong; Kowloon Hong Kong