Angular Dispersion of Free-Electron-Light Coupling in an Optical Fiber-Integrated Metagrating.

ABSTRACT: Free electrons can couple to optical material excitations on nanometer-length and attosecond-time scales, opening-up unique opportunities for both the generation of radiation and the manipulation of the electron wave function. Here, we exploit the Smith-Purcell effect to experimentally study the coherent coupling of free electrons and light in a circular metallo-dielectric metagrating that is fabricated onto the input facet of a multimode optical fiber. Using hyperspectral angle-resolved (HSAR) far-field imaging inside a scanning electron microscope, we probe the angular dispersion of Smith-Purcell radiation (SPR) that is simultaneously generated in free space and inside the fiber by an electron beam that grazes the metagrating at a nanoscale distance. Furthermore, we analyze the spectral

SUBMITTER: Liebtrau M 

PROVIDER: S-EPMC10958598 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature