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Improved terahertz Smith-Purcell radiation using side-opening cylindrical gratings

机译：采用侧开圆柱形改进了Terahertz Smith-Purcell辐射

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摘要

The Smith-Purcell radiation (SPR) is a promising way for generating terahertz emission, which has tremendous application prospects. Yet, the conventional SPR schemes generally utilize the Gaussian electron beam/bunch with round cross section (also called a pencil beam) to interact with a planar grating. The shape mismatching between the electron beam and the grating essentially restricts the interaction efficiency together with the radiation intensity. To counteract this effect, we propose to use side-opening cylindrical gratings (SOCGs) to replace planar gratings. Detailed theoretical analyses using the surface-current model and mode-matching method are performed for the first time. A train of premodulated electron bunches is proposed to drive the SOCG, on which the electron bunches are further micro-bunched by interacting with the surface waves. The multi-bunched electron beam then generates multi-color coherent SPR at the superimposed harmonics of the train of bunches. Compared with that from a planar grating, the radiation intensity from the SOCG can be significantly enhanced, indicating that it is a promising way of developing high-power terahertz wave sources.
机译：史密斯 - 斑块辐射（SPR）是一种充分发电的有希望的方式，具有巨大的应用前景。然而，传统的SPR方案通常利用具有圆形横截面（也称为铅笔梁）的高斯电子束/束来与平面光栅相互作用。电子束与光栅之间的形状与辐射强度基本上限制了相互作用效率。为了抵消这种效果，我们建议使用侧开圆柱形光栅（SOCG）来取代平面光栅。使用表面电流模型和模式匹配方法的详细理论分析是第一次执行。提出了一种初始化的电子束的火车以驱动SOCG，通过与表面波相互作用，电子束进一步微束。然后，多束的电子束在串列串的叠加谐波处产生多色相干SPR。与从平面光栅相比，可以显着提高来自SOCG的辐射强度，表明它是开发高功率太赫兹波源的有希望的方式。

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  • 来源
    《Journal of Applied Physics》 |2020年第18期|184501.1-184501.8|共8页
  • 作者

    Weihao Liu; Li Sun; Zijia Yu; Baogen Sun; Hongliang Xu;

  • 作者单位

    College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu 211106 China;

    National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China;

    National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China;

    National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China;

    National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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