1. Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong SAR 999077 China
2. Hunan Key Laboratory for Super‐microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 China
3. State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong Kowloon Hong Kong SAR 999077 China
4. Institute for Materials Chemistry and Engineering Kyushu University Fukuoka 816–8580 Japan
5. Key Laboratory of Advanced Materials Processing & Mold (Zhengzhou University) Ministry of Education Zhengzhou Henan 450002 China