多偶极子振荡产生的增强太赫兹史密斯-帕塞尔辐射  

Enhanced Terahertz Smith-Purcell Radiation from Multi-dipole Oscillations

作　　者：王小松[1] 赵德强 潘依林 张平[1] WANG Xiao-song;ZHAO De-qiang;PAN Yi-lin;ZHANG Ping(School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]电子科技大学电子科学与工程学院,四川成都610054

出　　处：《真空电子技术》2020年第5期46-50,80,共6页Vacuum Electronics

摘　　要：电子从光栅表面掠过可以激发Smith-Purcell辐射,其辐射机制可以看作是自由电子激发的偶极子振荡运动产生的辐射。基于此,本文研究了运动的多偶极子振荡产生的增强Smith-Purcell辐射。通过理论分析和粒子模拟仿真,验证了多偶极子振荡增强辐射的具体机制。该机制有望用于提升Smith-Purcell辐射的效率,对发展基于该辐射的真空电子太赫兹辐射源探索工作具有指导意义。Electrons skimming over grating surface can excite Smith-Purcell radiation,which can be regarded as radiation generated by the moving dipole oscillations excited by free electrons.On this basis,we investigated the enhanced Smith-Purcell radiation generated by moving multi-dipole oscillations.Through theoretical analysis and computer simulation,the mechanism of enhanced radiation by multi-dipole oscillation is verified.This mechanism is expected to improve the efficiency of Smith-Purcell radiation and has a guiding significance for the exploration of terahertz vacuum electron device.

关 键 词：自由电子 Smith-Purcell辐射 多偶极子振荡 

分 类 号：O441.4[理学—电磁学]