1. State Key Laboratory of Luminescence and ApplicationsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences 3888 Eastern South Lake Road Changchun 130033 P. R. China
2. Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacauAvenida da Universidade Taipa Macau 999078 P. R. China
3. Center of Information Optical TechnologiesITMO University Saint Petersburg 197101 Russia
4. Key Laboratory of ColloidInterface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of Sciences Bei Yi Jie 2, Zhong Guan Cun Beijing 100190 P. R. China
5. School of Materials Science and EngineeringElectron Microscopy CenterJilin University Changchun 130012 P. R. China
6. Department of Electron Microscopy ResearchKorea Basic Science Institute Daejeon 34133 South Korea
7. Department of Materials Science and Engineeringand Centre for Functional Photonics (CFP)City University of Hong Kong Kowloon Hong Kong S.A.R.