Recently, Professor Duan Zhaoyun from the School of Electronic Science and Engineering published a review paper titled 'Development of Vacuum Electronic Devices Inspired by Metamaterials: An Emerging Research Direction in Vacuum Electronics' in the March 2026 issue (Volume 4, Issue 1) of IEEE Electron Devices Magazine. This flagship quarterly journal of the IEEE Electron Devices Society dedicated this special issue to the theme of vacuum electronics, featuring six review papers co-authored by renowned scholars from institutions such as the University of New Mexico, University of Cambridge, and University of Electronic Science and Technology of China. Vacuum electronics investigates the generation of charged particles in a vacuum and their interaction with electromagnetic waves. By integrating metamaterials with nanoscale vacuum transistors, this field breaks through the physical limitations of traditional silicon-based chips, heralding a revival of vacuum electronics and its potential applications in high-performance, radiation-resistant, and miniaturized systems. The review, co-authored by Professor Duan Zhaoyun and Professor Edl Schamiloglu from the University of New Mexico, USA, reviews the development history of metamaterial-inspired vacuum electronic devices. It highlights their exceptional characteristics, including miniaturization, lightweight design, high power, high efficiency, and high gain, achieved through unique electromagnetic control capabilities. The paper also outlines future development trends, emphasizing that AI-assisted design and 3D printing technologies will drive the transition of this field from laboratory research to industrial applications. With profound expertise in metamaterial electronics, Professor Duan Zhaoyun's team has demonstrated its international standing and academic influence through this publication, providing theoretical support and technological guidance for the global development of the vacuum electronics industry.