1. Department of Materials Science and Engineering
2. City University of Hong Kong
3. Kowloon 999077
4. China
5. State Key Laboratory of Terahertz and Millimeter Waves
6. State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering
7. University of Electronic Science and Technology of China
8. Chengdu 610054
9. Key Laboratory of Advanced Materials Processing & Mold (Zhengzhou University)
10. Ministry of Education
11. Zhengzhou 450002