Exotic radiation from a photonic crystal excited by an ultra-relativistic electron beam
arXiv:cond-mat/0604624 · doi:10.1103/PhysRevE.74.056601
Abstract
We report the observation of an exotic radiation (unconventional Smith-Purcell radiation) from a one-dimensional photonic crystal. The physical origin of the exotic radiation is direct excitation of the photonic bands by an ultra-relativistic electron beam. The spectrum of the exotic radiation follows photonic bands of a certain parity, in striking contrast to the conventional Smith-Purcell radiation, which shows solely a linear dispersion. Key ingredients for the observation are the facts that the electron beam is in an ultra-relativistic region and that the photonic crystal is finite. The origin of the radiation was identified by comparison of experimental and theoretical results.
4 pages, 5 figures
References in corpus (3)
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- Theory of unconventional Smith-Purcell radiation in finite-size photonic crystals