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The intensity of Smith-Purcell radiation from metallic and dielectricgratings (silicon, silica) is compared in a frequency-domain simulation. Thenumerical model is discussed and verified with the Frank-Tamm formula forCherenkov radiation. For 30 keV electrons, rectangular dielectric gratings areless efficient than their metallic counterpart, by an order of magnitude forsilicon, and two orders of magnitude for silica. For all gratings studied,radiation intensity oscillates with grating tooth height due to electromagneticresonances in the grating. 3D and 2D numerical models are compared.

Frequency-domain calculation of Smith-Purcell radiation for metallic and dielectric gratings