1. Engineering Research
Center of Molecular and Neuro Imaging, Ministry of Education, School
of Life Science and Technology, Xidian University, Xi’an, Shanxi 710071, China
2. Key Laboratory
of Superlight Materials and Surface Technology, Ministry of Education,
College of Material Sciences and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
3. Fachbereich
Physik, Philipps Universität Marburg, 35037 Marburg, Germany
4. Key Laboratory of Molecular Imaging of Chinese Academy
of Sciences, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China