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

N. Horiuchi·T. Ochiai·J. Inoue·Y. Segawa·Y. Shibata·K. Ishi·Y. Kondo·M. Kanbe·H. Miyazaki·F. Hinode·S. Yamaguti·K. Ohtaka
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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.

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N. Horiuchi, T. Ochiai, J. Inoue, Y. Segawa, Y. Shibata, K. Ishi, Y. Kondo, M. Kanbe, H. Miyazaki, F. Hinode, S. Yamaguti, K. Ohtaka. 2006-04-27. Exotic radiation from a photonic crystal excited by an ultra-relativistic electron beam. https://doi.org/10.1103/physreve.74.056601

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