论文标题
史密斯 - 纯辐射中的加速波产生
Generation of Accelerating Waves in Smith-Purcell Radiation
论文作者
论文摘要
Metasurface最近成为一个强大的平台，用于在中尺度上设计自由电子辐射的波浪包。在这里，我们提出，当移动电子与一系列双异型元原子相互作用时，可以产生加速波。通过更改固有耦合强度，我们显示了从双性异性元原子的史密斯 - 纯辐射的全幅度覆盖范围和0到π相切换。这种不寻常的特性导致创建通风的光束，在传播过程中沿抛物线轨迹移动。实验实现显示，可以通过设计师Bianisotropic Metasuface通过Smith-Purcell辐射将带有槽波导界定的渐射场耦合到加速波中。我们的结果为具有无衍射，自我加速和自我修复光束特性的自由电子激光器提供了另一种途径。
Metasurface has recently emerged as a powerful platform to engineer wave packets of free electron radiation at the mesoscale. Here, we propose that accelerating waves can be generated when moving electrons interact with an array of bianisotropic meta-atoms. By changing the intrinsic coupling strength, we show full amplitude coverage and 0-to-π phase switching of Smith-Purcell radiation from bianistropic meta-atoms. This unusual property leads to the creation of Airy beams that shifts along a parabolic trajectory during propagation. Experimental implementation displays that evanescent fields bounded at slotted waveguides can be coupled into accelerating waves via Smith-Purcell radiation from a designer bianisotropic metasuface. Our results offer an alternative route towards free electron lasers with diffraction-free, self-accelerating, and self-healing beam properties.
