| Enhancement of Smith—Purcell radiation with surface-plasmon excitation |
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| 引用本文： | 张平,张雅鑫,周俊,刘维浩,钟任斌,刘盛纲.Enhancement of Smith—Purcell radiation with surface-plasmon excitation[J].中国物理 B,2012,21(10):104102-104102. |
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| 作者姓名： | 张平 张雅鑫 周俊 刘维浩 钟任斌 刘盛纲 |
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| 作者单位： | Terahertz Science and Technology Research Centre,University of Electronic Science and Technology of China |
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| 基金项目： | 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.
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| 关 键 词： | surface plasmon Smith-Purcell radiation enhancement |
| 收稿时间： | 2012-01-18 |
Enhancement of Smith-Purcell radiation with surface-plasmon excitation |
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| Zhang Ping,Zhang Ya-Xin,Zhou Jun,Liu Wei-Hao,Zhong Ren-Bin,Liu Sheng-Gang.Enhancement of Smith-Purcell radiation with surface-plasmon excitation[J].Chinese Physics B,2012,21(10):104102-104102. |
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| Authors: | Zhang Ping Zhang Ya-Xin Zhou Jun Liu Wei-Hao Zhong Ren-Bin Liu Sheng-Gang |
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| Institution: | 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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| Keywords: | surface-plasmon Smith-Purcell radiation enhancement |
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