Cylindrical Metalens for Generation and Focusing of Free-Electron Radiation.

ABSTRACT: Metasurfaces constitute a powerful approach to generate and control light by engineering optical material properties at the subwavelength scale. Recently, this concept was applied to manipulate free-electron radiation phenomena, rendering versatile light sources with unique functionalities. In this Letter, we experimentally demonstrate spectral and angular control over coherent light emission by metasurfaces that interact with free-electrons under grazing incidence. Specifically, we study metalenses based on chirped metagratings that simultaneously emit and shape Smith-Purcell radiation in the visible and near-infrared spectral regime. In good agreement with theory, we observe the far-field signatures of strongly convergent and divergent cylindrical radiation wavefronts using in situ

SUBMITTER: Karnieli A 

PROVIDER: S-EPMC9335868 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature