Free-electron resonance transition radiation via Brewster randomness.

ABSTRACT: Free-electron radiation, such as Cherenkov radiation and transition radiation, can generate light at arbitrary frequencies and is fundamental to diverse applications, ranging from electron microscopy, spectroscopy, lasers, to particle detectors. Generally, the features of free-electron radiation are stochastic when electrons interact with random media. Counterintuitively, here, we reveal a type of free-electron radiation that has both its intensity and directionality invariant to specific sorts of long-range structural randomness. Essentially, this invariance is enabled by the Brewster effect and the judiciously engineered phase coherence condition of emitted light, namely that the light induced by electron's penetration through a layered aperiodic nanostructure is engineered to interfere

SUBMITTER: Gong Z 

PROVIDER: S-EPMC11831145 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature