中国物理B ›› 2022, Vol. 31 ›› Issue (4): 44103-044103.doi: 10.1088/1674-1056/ac5390

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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)   

  1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 收稿日期:2021-10-28 修回日期:2022-01-30 接受日期:2022-02-10 出版日期:2022-03-16 发布日期:2022-03-29
  • 通讯作者: Ping Zhang E-mail:zhangping@uestc.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61921002, 62171098, and 92163204).

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)   

  1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2021-10-28 Revised:2022-01-30 Accepted:2022-02-10 Online:2022-03-16 Published:2022-03-29
  • Contact: Ping Zhang E-mail:zhangping@uestc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61921002, 62171098, and 92163204).

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摘要： 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.

关键词: Smith-Purcell radiation, multi-grating, resonance mode

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.

Key words: Smith-Purcell radiation, multi-grating, resonance mode

中图分类号:  (Radiation by moving charges)

  • 41.60.-m
07.57.Hm (Infrared, submillimeter wave, microwave, and radiowave sources)