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 …

Cherenkov radiation (CR) is a promising method to generate high-power terahertz (THz)
electromagnetic (EM) waves, which are highly desired in numerous practical applications …

Chiral light emission plays a key role in sensing, tomography, quantum communication,
among others. Whereas, achieving highly pure, tunable chirality emission across a broad …

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 …

An orbital angular momentum (OAM) antenna based on chiral harmonic diffraction of spoof
surface plasmon polaritons (SSPP) is demonstrated in this letter. Due to the diffraction of the …

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 …

Recent advances in spoof surface plasmon (SSP) have offered enormous opportunities for
engineering electromagnetic waves at the subwavelength scale. However, the fundamental …

In this paper, we design and analyze the channeled vacuum photocathodes with novel
structures towards low operating temperature, high current density, and miniaturized …

Vacuum electronic devices utilizing free-electron-based mechanisms are a crucial class of
terahertz radiation sources that operate by modulating electron beams. In this study, we …

Emission of terahertz waves in free electron lasers (FELs) with both linear and helical
undulators has been explored. The analysis employs Lienard-Wiechert fields to characterize …