title: Isotropic photonic gaps in a circular photonic crystal.
abstract: We investigated the optical properties of a circular photonic crystal (CPC) for which the distance between lattices was systematically distributed. The transmission spectra of CPC composed of alumina cylinders were examined in the frequency region from 0 to 20 GHz. We show that photonic gaps are obtained not only in CPCs but also in phase-shifted CPCs. The isotropic photonic gaps are evidenced by changes in the incident angle of a millimeter wave.
authors.affiliation: Photophysics Laboratory, Photodynamics Research Center, RIKEN, 519-1399, Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan. horiuchi@postman.riken.jp
authors.forename: N
authors.initials: N
authors.lastname: Horiuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Segawa
authors.forename: T
authors.initials: T
authors.lastname: Nozokido
authors.forename: K
authors.initials: K
authors.lastname: Mizuno
authors.forename: H
authors.initials: H
authors.lastname: Miyazaki