Generation of Airy beams in Smith–Purcell radiation

• DOI: 10.1364/ol.460106
• Publication Date: 2022-05-10T15:30:17Z
• Authors: Liqiao Jing; Dashuang Liao; Jie Tao; Hongsheng Chen; Zuojia Wang
• Keywords: Airy beam

The metasurface has recently emerged as a powerful platform to engineer wave packets of free electron radiation at the mesoscale. Here, we propose that Airy beams can be generated when moving electrons interact with bianisotropic metasurfaces. By changing intrinsic coupling strength, full amplitude coverage and 0-to-π phase switching Smith-Purcell realized from meta-atoms. This unusual property shifts front assembled beam toward parabolic trajectory. Experimental implementation displays evanescent fields bounded slotted waveguides coupled into via designed metasurface. Our method design strategy offer an alternative route free-electron lasers diffraction-free, self-accelerating, self-healing properties.