Terahertz sheet beam vacuum electron devices

1.National Key Laboratory of Science and Technology on Vacuum Electronics in Chengdu, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;2.National Key Laboratory of Science and Technology on Vacuum Electronics in Beijing, Beijing Vacuum Electronics Research Institute, Beijing 100015, China;3.School of Electronics and Information Engineering, Beihang University, Beijing 100191, China

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Supported by the National Natural Science Foundation of China (62131006, 61871095, 61921002);

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    Sheet beam is a kind of electron beam, whose cross-section is approximate rectangular or elliptical shape with high aspect ratio. Compared with conventional pencil beam, sheet beam has many advantages, such as high beam current and large interaction area. Terahertz science and technology have got rapid development in recent years owing to its high frequency, wide bandwidth, high-speed transmission rate, and other advantages of terahertz waves. As a kind of new-type vacuum electron devices, terahertz sheet beam devices have excellent performance such as high power, high gain, high efficiency, and miniaturization. However, it is difficult for sheet beam to keep stable transport over a long distance due to the existence of Diocotron instability, which cannot lead to fully demonstrating its technical advantages. This paper briefly summarizes the generation, formation, and focusing methods of sheet beam, and then introduces the state-of-the-art of terahertz sheet beam devices. Finally, the challenges and development tendencies are discussed.

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LYU Zhi-Fang, ZHANG Chang-Qing, WANG Zhan-Liang, JIANG Sheng-Kun, RUAN Cun-Jun, FENG Jin-Jun, GONG Yu-Bin, DUAN Zhao-Yun. Terahertz sheet beam vacuum electron devices[J]. Journal of Infrared and Millimeter Waves,2023,42(1):26~36

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  • Received:March 20,2022
  • Revised:January 04,2023
  • Adopted:April 27,2022
  • Online: January 03,2023
  • Published: