Zhang P, Wang L, Zhang Y, Aimidula A, Tang M
Opt Express. 2019 Feb 18;27(4):3952-3962. doi: 10.1364/OE.27.003952.
We present an intensive vertical orientation Smith-Purcell radiation with the 2D well-array metasurface. It is shown that the moving electrons can induce three induced surface currents at the well-array metasurface, where a strong coupling among them takes place. The coupling significantly improves the radiated field intensity and shapes the radiation angle-distribution. The theoretical results show that the Smith-Purcell radiation's field intensity is 3 times larger than the one within a conventional grating structure with directional radiation at 90 degree. Therefore, much stronger intensity and more centralized directional radiation will provide a promising way to develop electron beam driven THz sources.
我们展示了一种利用二维阱阵列超表面实现的强垂直取向史密斯-帕塞尔辐射。结果表明，运动电子可在阱阵列超表面诱导出三种感应表面电流，它们之间发生强耦合。这种耦合显著提高了辐射场强度并塑造了辐射角分布。理论结果表明，史密斯-帕塞尔辐射的场强比传统光栅结构中90度方向辐射的场强大3倍。因此，更强的强度和更集中的定向辐射将为开发电子束驱动太赫兹源提供一条有前景的途径。
