ASYMMETRIC PHOTONIC CRYSTAL WAVEGUIDE ELEMENT HAVING SYMMETRIC MODE FIELDS

摘要

A slab photonic crystal waveguide that preserves the parity of guided modes. The waveguide includes a photonic crystal layer interposed between two dielectric layers. The photonic crystal layer includes a periodic arrangement of asymmetrically shaped dielectric regions within a surrounding dielectric material. The waveguide precludes conversion of the state of parity of an introduced input mode by maintaining a symmetric mode field distribution. A symmetric mode field distribution is attained through variations in the dielectric constants of the dielectric layers that compensate for asymmetric mode localization tendencies associated with the asymmetric periodically arranged dielectric regions within the photonic crystal layer.