Theory of the Smith-Purcell effect

CST simulations of THz Smith–Purcell radiation from a lamellar grating with vacuum gaps

“…For both the theory and the experiment the period of SPR intensity oscillations was approximately equal to the value of k/2, where k is the observation wavelength. This result is also in agreement with earlier theoretical work discussed in [20]. Similar behaviour was identified in the simulations for THz frequency region.…”

Surface-coupling of Cerenkov radiation from a modified metallic metamaterial slab via Brillouin-band folding

“…4 that the proposed structure-II is superior to the reflection grating in term of the intensity of the radiation. This enhanced radiation capability of structure-II in comparison with the reflection grating can be attributed to the phenomenon of coupling of Cerenkov radiation generated via Brillouin-zone band folding in structure-II, which is absent in the reflection grating where the surface electromagnetic waves supported by a grating are known to be excited by the moving electron bunch, and which, however, cannot contribute to the far-field radiation [20,21]. Fig.…”

Does a Form Factor in Smith–Purcell Radiation Exist Always?

“…Smith-Purcell radiation is excited when charged particles travel near a target that is periodic in the direction of charge motion. Smith-Purcell radiation was experimentally observed in 1953 [13] and later studied in detail theoretically and experimentally for diffraction gratings of various profiles made from different materials [14][15][16]. If the inhomogeneity along the beam motion is arbitrary or aperiodic, the term diffraction radiation is used.…”

“…Note that the vectors P m and ρ m are independent of the integration variable r e , i.e., of the electron position in the bunch. Summation over the index results, after a number of manipulations, in the appearance of the factor (14) This factor is typical of SPR and determines the general shape of the spectral and angular distribution of…”