We experimentally demonstrate several physical concepts necessary for the future development of dielectric laser accelerators—photonic elements that utilize the inelastic interaction between electrons and the optical near fields of laser-illuminated periodic nanostructures. To build a fully photonic accelerator, concatenation of elements, large energy gains, and beam steering elements are required. Staged acceleration is shown using two spatio-temporally separated interaction regions. Further, a chirped silicon grating is used to overcome the velocity dephasing of subrelativistic electrons with respect to its optical near fields, and last, a parabolic grating geometry serves for focusing of the electron beam.

中文翻译：

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介电激光加速器的元件

我们通过实验证明了电介质激光加速器的未来发展所必需的几个物理概念，这些光子利用电子与激光照射的周期性纳米结构的光学近场之间的非弹性相互作用。为了构建一个完整的光子加速器，需要元素级联，大的能量增益和光束控制元素。使用两个时空分隔的交互区域显示了阶段加速。此外，used线性硅光栅用于克服亚相对论电子相对于其光学近场的速度相移，最后，抛物线光栅的几何形状用于聚焦电子束。