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Chin. Phys. B, 2012, Vol. 21(10): 104102    DOI: 10.1088/1674-1056/21/10/104102
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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)
Terahertz Science and Technology Research Centre, University of Electronic Science and Technology of China, Chengdu 610054, China
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.
Keywords:  surface-plasmon      Smith-Purcell radiation      enhancement  
Received:  18 January 2012      Revised:  05 April 2012      Accepted manuscript online: 
PACS:  41.60.-m (Radiation by moving charges)  
  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61001031).
Corresponding Authors:  Zhang Ping     E-mail:  zhangping@uestc.edu.cn

Cite this article: 

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) Enhancement of Smith–Purcell radiation with surface-plasmon excitation 2012 Chin. Phys. B 21 104102

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