1. State Key Laboratory of Terahertz and Millimeter Wave City University of Hong Kong Hong Kong 999077 China
2. Department of Electrical Engineering City University of Hong Kong Hong Kong 999077 China
3. School of Microelectronics Science and Technology Sun Yat‐sen University Zhuhai 519000 China
4. Centre for Biosystems, Neuroscience, and Nanotechnology City University of Hong Kong Hong Kong 999077 China