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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 |
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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.
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Received: 18 January 2012
Revised: 05 April 2012
Accepted manuscript online:
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PACS:
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41.60.-m
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(Radiation by moving charges)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61001031). |
Corresponding Authors:
Zhang Ping
E-mail: zhangping@uestc.edu.cn
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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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