Sergeeva D Yu, Aryshev A S, Tishchenko A A, Popov K E, Terunuma N, Urakawa J
Opt Lett. 2021 Feb 1;46(3):544-547. doi: 10.1364/OL.416842.
We report the results of experimental and theoretical studies of monochromatic coherent terahertz radiation generated by a short relativistic electron bunch interacting with a metasurface. The metasurface consists of subwavelength metal elements arranged on a dielectric substrate. The constructed theory explains the experimental spectra of Smith-Purcell radiation and grating transition radiation with very high precision. The orientational distribution of transition radiation shows a fine structure, which, as we suppose, may be due to contribution of coupling between the metasurface's elements.
我们报告了关于短相对论电子束与超表面相互作用产生的单色相干太赫兹辐射的实验和理论研究结果。该超表面由排列在电介质基板上的亚波长金属元件组成。所构建的理论以非常高的精度解释了史密斯 - 珀塞尔辐射和光栅跃迁辐射的实验光谱。跃迁辐射的取向分布呈现出精细结构，我们认为这可能是由于超表面元件之间耦合的贡献。
