表面等离激元在真空电子学中的应用  

Application of Surface Plasmons in Vacuum Electronics

作　　者：杜朝海[1] 朱娟峰 刘濮鲲[1] DU Chao-hai;ZHU Juan-feng;LIU Pu-kun(Department of Electronics,Peking University,Beijing 100871,China)

机构地区：[1]北京大学电子学系区域光纤通信网与新型光通信系统国家重点实验室,北京100871

出　　处：《真空电子技术》2021年第5期1-12,共12页Vacuum Electronics

基　　金：国家自然科学基金NSAF联合项目(U1830201);国家自然科学基金(61861130367,61971013);英国皇家学会高级牛顿基金(NAF/R1/180121);国家重点研发计划(2019YFA0210203)。

摘　　要：表面等离激元起源于金属与介质界面上电子与电磁波的共振作用,可实现对电磁波的近场局附、表面场增强和多维度操控等。真空电子学主要研究内容是基于自由电子与电磁波互作用进行能量交换,进而实现电磁波激发与放大、电子加速等功能。将表面等离激元应用于真空电子学,基于表面等离激元的局域场增强和灵活操控优势有望显著增强电子注-波互作用的某些特性,为推动真空电子器件向集成化、高效率、高频率等方向发展提供新思路。本文对典型的表面等离激元结构及其在真空电子学领域的初步应用进行了综述,抛砖引玉,以引发相关研究人员对表面等离激元学和真空电子学方向的兴趣和思考。Surface plasmons originate from the oscillations between electromagnetic wave and electrons at metal-dielectric interface.Plasmons have many intriguing characteristics,such as near-field confinement,local field enhancement,and multi-dimensional manipulation.Vacuum electronics investigate the interaction between free electrons and electromagnetic waves,which can be used to achieve electromagnetic wave excitation and amplification,electron acceleration,and so on.When the surface plasmonics are combined with vacuum electronics to fully explore the advantages of near-field enhancement and highly flexible manipulation,it is expected to strengthen some of the characteristics related to electron beam-wave interaction and promote the development of vacuum electronic devices towards miniaturization,high efficiency,and high-frequency operation.In this paper,a brief review of typical surface plasmons and their initial applications in the field of vacuum electronics is presented,toward triggering more extensive interests and thinking related to the field of surface plasmons vacuum electronics.

关 键 词：切伦科夫辐射 史密斯-帕塞尔辐射 表面等离激元 真空电子 

分 类 号：O441[理学—电磁学]