Certain radiative processes have their characteristics, such as spectrum, spatial distribution or yield, modified by the medium in which they are generated. Such media are referred to as structurally active media. This article examines some of these processes, such as fluorescence, Raman scattering and the Cerenkov effect in the X-UV range. The active media considered are periodic structures capable of producing Laue–Bragg diffraction; the phenomena involved are the Purcell–Kleppner effect, Kossel diffraction, the anomalous Lamb effect and the Bragg–Raman and Bragg–Cerenkov effects.
ANDRÉ et al. (2026) studied this question.