1. School of Information Science and Engineering
2. Dalian Polytechnic University
3. Dalian
4. China
5. College of Microelectronics and Key Laboratory of Optoelectronics Technology
6. Faculty of Information Technology
7. Beijing University of Technology
8. Beijing
9. Department of Electrical Engineering and State Key Laboratory of Terahertz and Millimeter Waves
10. City University of Hong Kong
11. Kowloon