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Observation of millimeter-wave radiation generated by the interaction between an electron beam and a photonic crystal

K. Yamamoto1,*, R. Sakakibara2, S. Yano1, Y. Segawa1,2, Y. Shibata3, K. Ishi3, T. Ohsaka3, T. Hara4, Y. Kondo4 et al.

H. Miyazaki4, F. Hinode5, T. Matsuyama5, S. Yamaguti6, and K. Ohtaka7

  • 1Photodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), Sendai 980-0845, Japan
  • 2Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 3Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
  • 4Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
  • 5Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan
  • 6Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan
  • 7Center for Frontier Science, Chiba University, Chiba 263-8522, Japan

  • *Present address: Institute of Physics, University of Tsukuba, Tsukuba 305-8571, Japan.
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Phys. Rev. E 69, 045601(R) – Published 29 April, 2004

DOI: https://doi.org/10.1103/PhysRevE.69.045601

Abstract

We observed directional light emission in the millimeter-wave region when a high-energy (150 MeV) electron beam passes just above a photonic crystal made of polytetrafluoroethylene beads (≃3.2mm in diameter). The relation between the momentum and the energy of the emitted photons strongly suggests that the observed light is generated by the umklapp scattering process that changes the evanescent waves emitted by the electron beam into observable ones. By comparing the observed spectra with calculated ones based on the photonic band structure, we found that generated photons excite the photonic band modes making them observable as enhanced fine structures in the emission spectra.

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References (21)

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  20. Although we cannot clarify the origins of the peaks, which are absent in the calculated spectrum, we can speculate that these peaks also arise from the excitation of the photonic band modes. Some of the PBs and the H−1,0 line may cross at the energy of these peaks due to a slight difference in the PB structure from what is calculated. A possible reason for the change in the PB structures is a slight deformation of the PhC sample.
  21. The difference in the emission intensity ratios among the peaks between the observed and calculated spectra might partly be caused by the damping effect due to the slight distortion of the PhC lattice structure. Since these modes are strongly confined and stay a longer time within the PhC, they are affected more substantially by the damping effect while they stay within the PhC. According to our calculation, the sharp peaks are easily affected by the damping effect, and weaken their intensity. This may especially be the case for the peaks at around 100 GHz.

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Phys. Rev. E 69, 045601(R)– Published 29 April, 2004
  • Received 7 November 2003

© 2004 American Physical Society

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