Isotropic photonic gaps in a circular photonic crystal.
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.
Horiuchi
N
N
Photophysics Laboratory, Photodynamics Research Center, RIKEN, 519-1399, Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan. horiuchi@postman.riken.jp
Segawa
Y
Y
Nozokido
T
T
Mizuno
K
K
Miyazaki
H
H