中国物理B ›› 2012, Vol. 21 ›› Issue (10): 104102-104102.doi: 10.1088/1674-1056/21/10/104102

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Enhancement of Smith–Purcell radiation with surface-plasmon excitation

张平, 张雅鑫, 周俊, 刘维浩, 钟任斌, 刘盛纲   

  1. Terahertz Science and Technology Research Centre, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 收稿日期:2012-01-18 修回日期:2012-04-05 出版日期:2012-09-01 发布日期:2012-09-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61001031).

Enhancement of Smith–Purcell radiation with surface-plasmon excitation

Zhang Ping (张平), Zhang Ya-Xin (张雅鑫), Zhou Jun (周俊), Liu Wei-Hao (刘维浩), Zhong Ren-Bin (钟任斌), Liu Sheng-Gang (刘盛纲)   

  1. Terahertz Science and Technology Research Centre, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2012-01-18 Revised:2012-04-05 Online:2012-09-01 Published:2012-09-01
  • Contact: Zhang Ping E-mail:zhangping@uestc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61001031).

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摘要： With the aid of a three-dimensional particle-in-cell code simulation, the enhancement of Smith-Purcell radiation with a surface-plasmon mode excited by a single electron bunch and by a premodulated electron beam is considered in the paper. In the simulation, the model is a grating covered by Ag film. The results demonstrate that when the surface-plasmon mode is excited by a single electron bunch, the maximum radiation occurs at an observation angle depending on the surface-plasmon frequency, and the radiation power can be enhanced more than ten times. And for pre-bunched electron beam excitation, when one of the harmonics of the bunching frequency is resonant with that of the surface-plasmon mode, the radiation power is twenty times more than that from a perfectly conducting grating excited by the same premodulated electron beam.

关键词: surface-plasmon, Smith-Purcell radiation, enhancement

Abstract: With the aid of a three-dimensional particle-in-cell code simulation, the enhancement of Smith-Purcell radiation with a surface-plasmon mode excited by a single electron bunch and by a premodulated electron beam is considered in the paper. In the simulation, the model is a grating covered by Ag film. The results demonstrate that when the surface-plasmon mode is excited by a single electron bunch, the maximum radiation occurs at an observation angle depending on the surface-plasmon frequency, and the radiation power can be enhanced more than ten times. And for pre-bunched electron beam excitation, when one of the harmonics of the bunching frequency is resonant with that of the surface-plasmon mode, the radiation power is twenty times more than that from a perfectly conducting grating excited by the same premodulated electron beam.

Key words: surface-plasmon, Smith-Purcell radiation, enhancement

中图分类号:  (Radiation by moving charges)

  • 41.60.-m
73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))