1. School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing, People’s Republic of China
2. College of Mechanical and Electrical Engineering, Daqing Normal University, Daqing, People’s Republic of China
3. Media Lab, Massachusetts Institute of Technology, Cambridge, USA
4. Department of Physics, City University of Hong Kong, Kowloon, Hong Kong
5. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong
6. Department of Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong