Smith-Purcell Radiation from Rough Surfaces

Details Smith-Purcell Radiation from Rough Surfaces Smith-Purcell Radiation from Rough Surfaces

2010-05-21

arxiv.org/abs/1005.3950v2

Phys.Rev.ST Accel.Beams 13:070705,2010

Physics

Accelerator Physics

6 pages, 2 figures, submitted to Phys. Rev. ST Accel. Beams

Scientific paper

10.1103/PhysRevSTAB.13.070705

Radiation of a charged particle moving parallel to a inhomogeneous surface is considered. Within a single formalism periodic and random gratings are examined. For the periodically inhomogeneous surface we derive new expressions for the dispersion relation and the spectral-angular intensity. In particular, for a given observation direction two wavelengths are emitted instead of one wavelength of the standard Smith-Purcell effect. For a rough surface we show that the main contribution to the radiation intensity is given by surface polaritons induced on the interface between two media. These polaritons are multiply scattered on the roughness of surface and convert into real photons. The spectral-angular intensity is calculated and its dependence on different parameters is revealed.

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