1. Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
2. Nanjing Jingcui Optical Technology Co., Ltd., Nanjing 211135, China
3. Department of General Physics, Ufa University of Science and Technology, Ufa 450076, Russia
4. College of Information Science and Technology, Donghua University, Shanghai 201620, China