title: Observation of millimeter-wave radiation generated by the interaction between an electron beam and a photonic crystal.
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 ( approximately 3.2 mm 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.
authors.affiliation: Photodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), Sendai 980-0845, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: R
authors.initials: R
authors.lastname: Sakakibara
authors.forename: S
authors.initials: S
authors.lastname: Yano
authors.forename: Y
authors.initials: Y
authors.lastname: Segawa
authors.forename: Y
authors.initials: Y
authors.lastname: Shibata
authors.forename: K
authors.initials: K
authors.lastname: Ishi
authors.forename: T
authors.initials: T
authors.lastname: Ohsaka
authors.forename: T
authors.initials: T
authors.lastname: Hara
authors.forename: Y
authors.initials: Y
authors.lastname: Kondo
authors.forename: H
authors.initials: H
authors.lastname: Miyazaki
authors.forename: F
authors.initials: F
authors.lastname: Hinode
authors.forename: T
authors.initials: T
authors.lastname: Matsuyama
authors.forename: S
authors.initials: S
authors.lastname: Yamaguti
authors.forename: K
authors.initials: K
authors.lastname: Ohtaka