Patent ID: 7660506

Claim:
An optical waveguide structure comprising a slab type two-dimensional photonic crystal and a channel optical waveguide provided in said photonic crystal, said photonic crystal comprising a slab of a dielectric film and a plurality of lattice columns each comprising dielectric pillars; wherein said dielectric pillars included in said lattice columns at least of n'th order (n represents 1, 2, 3, 4 and 5) in distance with respect to said channel optical waveguide have a planar shape of an equilateral polygon or exact circle; and wherein said slab of dielectric film exhibits an electro-optic effect, and said dielectric pillars included in at least one of said lattice columns of n'th order (n represents 2, 3, 4 and 5) in distance with respect to said channel optical waveguide has a size rn larger than a fundamental size ro, wherein each of said plurality of lattice columns extends along the longitudinal length of said channel optical waveguide, and wherein each of said dielectric pillars in the same lattice column of n'th order (n represents 1, 2, 3, 4 and 5) has the same size and said lattice columns are spaced from said channel optical waveguide in said photonic crystal.