Coherent Smith-Purcell Radiation Sources Based on Dielectric Gratings
Year: 2020
Type: preprint
Abstract: We describe a simple method to produce coherent Smith-Purcell radiation with a single dielectric grating. The scheme exploits a strong resonance which enables staggering enhancements of diffraction modes of a subwavelength grating under evanescent wave incidence. The interaction between a continuous electron beam and the resonant mode can bunch electrons, resulting in coherent oscillation, and consequently superradiant Smith-Purcell radiation. Using a higher-order diffraction mode for Smith-Purcell radiation allows one to use low-energy electrons available from tabletop sources. This work potentially paves the way to a compact coherent radiation source, which may find application in the fields of communications, physics, and biology.
Source: arXiv (Cornell University)
Authors: Zhaofu Chen, Xiaohan Sun
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3084872320