| 摘要 |
A photonic structure has rods arranged with periodicity which is of a non-translational symmetry and defined in a polar coordinate system, which uses a distance in a radial direction and an angle in a circumferential direction, and has a center of the polar coordinate system used as a reference. A heterointerface is provided between adjoining areas of the plurality of areas. The positions of the centers of the polar coordinate systems of the plurality of areas are different. Lines of rods are smoothly connected between adjoining areas of the plurality of areas at the heterointerfaces. Rods are removed in a spiral shape or in a curve whose radius of curvature changes, to form an optical waveguide in the spiral shape or in the curve.
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