| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Smith-Purcell radiation improved by multi-grating structure |
| Jing Shu(舒靖), Ping Zhang(张平)†, Man Liang(梁满), Sheng-Peng Yang(杨生鹏), Shao-Meng Wang(王少萌), and Yu-Bin Gong(宫玉彬) |
| School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract The photonic crystal structure has attracted much attention due to its ability to confine light. In this paper, we present our study on an improved Smith-Purcell radiation from a simple metal photonic crystal excited by moving electrons. Different from the wide-band Smith-Purcell radiation from a single metal grating, the results show that the injected electrons could induce more dipole oscillations inside the multi-grating structure, and it leads to the enhancement of the radiation intensity. In addition, there are strong resonances in metal multi-grating structure, and the resonance characteristics may narrow the radiation band, which leads to a radiation with an obvious peak in the spectrum. Therefore, the multi-grating structure has the ability to enhance the radiation intensity and shape the radiation frequency band. By optimizing the structure parameters, coherent and tunable Smith-Purcell radiation can be realized, and it provides a potential way to develop band-controllable light or THz radiation source.
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Received: 28 October 2021
Revised: 30 January 2022
Accepted manuscript online: 10 February 2022
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PACS:
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41.60.-m
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(Radiation by moving charges)
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07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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87.50.U-
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61921002, 62171098, and 92163204). |
Corresponding Authors:
Ping Zhang
E-mail: zhangping@uestc.edu.cn
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Cite this article:
Jing Shu(舒靖), Ping Zhang(张平), Man Liang(梁满), Sheng-Peng Yang(杨生鹏), Shao-Meng Wang(王少萌), and Yu-Bin Gong(宫玉彬) Smith-Purcell radiation improved by multi-grating structure 2022 Chin. Phys. B 31 044103
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