Wave-mixing cathodoluminescence microscopy of low-frequency excitations.

ABSTRACT: Nonlinear optical phenomena such as parametric amplification and frequency conversion are typically driven by external optical fields. Free electrons can also act as electromagnetic sources, offering unmatched spatial precision. Therefore, combining optical and electron-induced fields via the nonlinear response of material structures holds potential for revealing new physical phenomena and enabling disruptive applications. Here, we theoretically investigate wave mixing between external light and the evanescent fields of free electrons, giving rise to inelastic photon scattering mediated by the second-order nonlinear response of a specimen. Specifically, an incident photon may be blue- or red-shifted, while the passing electron correspondingly loses or gains energy. These processes are stro

SUBMITTER: Prelat L 

PROVIDER: S-EPMC12749347 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature