1. Department of Physics; East China University of Science and Technology; Shanghai 200237 China
2. Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent OH 44242 USA
3. National Laboratory of Solid State Microstructures; Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences; Nanjing University; Nanjing 210093 China
4. Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics; Institute of Physics; Chinese Academy of Sciences; Beijing 100190 China
5. Visual and Biomedical Optics Lab; Department of Ophthalmology and Visual Science and Department of Electrical and Computer Engineering; Ohio State University; Columbus OH 43212 USA