University of Science and Technology of China (USTC) - School of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Standardization and Measurement for Nanotechnology, Chinese Academy of Sciences (CAS) - Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications, University of Science and Technology of China (USTC) - School of Nano-Tech and Nano-Bionics, University of Science and Technology of China (USTC) - School of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) - Division of Advanced Materials, Chinese Academy of Sciences (CAS) - Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications, University of Science and Technology of China (USTC) - School of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) - Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications, Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Standardization and Measurement for Nanotechnology and Chinese Academy of Sciences (CAS) - Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications