Patent ID: 7912335

Claim:
A two-dimensional photonic crystal having a periodic arrangement of refractive index distribution in a slab-shaped body, comprising: a) a first area having a photonic band gap for TE-polarized light; and b) a second area provided adjacent to the first area and having a photonic band gap for TM-polarized light, in which at least a part of an energy region is common to the photonic band gap of the TE-polarized light, wherein a waveguide passing through both the first area and the second area is provided for conducting light having energy within the part of the common energy region, the waveguide being defects created linearly in the first area connected to defects created linearly in the second area, and passing continuously through both the first and second areas, and a resonator is provided in the vicinity of the waveguides of the first area and the second area respectively, where the resonator resonates with the polarized light corresponding to the area.