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Smith-Purcell (SP) radiation from a charge running near a periodically grooved solid-state surface has a long history of investigation since the pioneering work of Smith and Purcell[1]. It is a kind of Cerenkov radiation, in which an evanescent photon emitted by the running charge turns to an observable one by the umklapp scattering by the periodic array of grooves; an evanescent photon originally present in the phase space outside the light line gets into the light cone when an umklapp shift of its momentum component takes place.
© 2001 IEEE
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