Recent advances in vortex Smith–Purcell radiation (V‐SPR) have spurred many
breakthroughs in the generation of vortex beams for their potential applications in chiral …

Light beams bearing orbital angular momentum (OAM) are used in various scientific and
engineering applications, such as microscopy, laser material processing, and optical …

Free‐electron radiations prompt numerous advanced applications such as particle
detectors, biological imaging, and light sources from microwave to X‐ray. While their …

We introduce the concept of polarized vortex Smith–Purcell radiation by the interaction of an
electron beam and cascaded metasurfaces. The spin and orbital angular momenta of Smith …

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 …

Based on the geometric phase theory, a broadband terahertz wave vortex beam generator
based on a transmissive plasmonic metasurface is proposed. The metasurface is composed …

The vortex beam provides a promising alternative for next-generation wireless
communication, but it is a long-standing challenge to generate a multi-mode and robust …

Smith–Purcell radiation (SPR) is an important means of generating terahertz waves, and the
enhancement of SPR is an attractive topic nowadays. Inspired by the phenomenon of …

In this article, a method to enable efficient emission of coherent radiation by using an intense
electron beam coupled with a quasi-bound state in the continuum (quasi-BIC) is …

An electromagnetic wavefront can be flexibly manipulated by discrete phase coding on the
coding unit. In this paper, we designed two coding metasurfaces with 1-bit and 3-bit based …