Exotic radiation from a photonic crystal excited by an ultra-relativistic electron beam

Details Exotic radiation from a photonic crystal excited by an ultra-relativistic electron beam Exotic radiation from a photonic crystal excited by an ultra-relativistic electron beam

2006-04-27

arxiv.org/abs/cond-mat/0604624v1

Phys.Rev.E74:056601,2006

Physics

Condensed Matter

Materials Science

4 pages, 5 figures

Scientific paper

10.1103/PhysRevE.74.056601

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.

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