Patent ID: 7280736

Claim:
A photonic crystal device comprising: a first dielectric substrate having a first striped structure, of which the dielectric constant changes periodically within a first plane; a second dielectric substrate having a second striped structure, of which the dielectric constant changes periodically within a second plane; and an adjustment device for changing a photonic band structure, defined by the first and second striped structures, by varying relative arrangement of the first and second striped structures, wherein the first and second dielectric substrates are stacked one upon the other, and wherein the adjustment device rotates at least one of the first and second dielectric substrates, and wherein the substrate driven by the adjustment device turns around a z-axis that passes the center of the substrate, and wherein the first and second dielectric substrates are both parallel to an xy plane that is perpendicular to the z-axis, and wherein in a transparent plan view, a lattice pattern formed by the first and second striped structures is varied by the adjustment device.