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.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics