CAVITY AND CHANNEL ADD/DROP FILTER BASED ON TWO-DIMENSIONAL PHOTONIC CRYSTALS

摘要

PURPOSE: A cavity and a channel add/drop filter based on two-dimensional photonic crystals is provided to form a high-Q cavity within a 2D photonic crystal, and combine such a cavity with a waveguide to make available a channel add/drop filter having high wavelength resolution. CONSTITUTION: A two-dimensional photonic crystal is configured by an arrangement of low-refractive-index substances having a small refractive index relative to the slab in a two-dimensional lattice of points defined in a slab(1) and being of identical dimension and shape. A cavity is made from a point defect(4) within the two-dimensional photonic crystal. The point defect contains among the lattice points a plurality of three or more neighboring one another. In the three or more lattice points, the low-refractive-index substances are missing from the arrangement. In the arrangement, at least one of the low-refractive-index substances is displaced by a predetermined distance from the at least one of the lattice points near to the point defect.