1. Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Physics, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
2. Department of Physics, Zhejiang University, 38 ZheDa Road, Hangzhou 310027, China
3. Department of Electronic Science and Technology, Tongji University, 4800 Caoan Road, Shanghai 201804, China