Patent ID: 6879766

Claim:
A photonic crystal waveguide for propagating and guiding an electromagnetic field comprising: a photonic crystal medium having a main part, an incident side to receive an incident wave of the electromagnetic field, and an outgoing side to produce an outgoing wave of the electromagnetic field, wherein a photonic crystal of an area disposed on the incident side or the outgoing side of said photonic crystal medium has a structure, in which an antireflection layer is disposed therein, that is different from that of the main part of said photonic crystal medium so as to prevent the electromagnetic field from being reflected in an input plane and an output plane of said photonic crystal medium to reduce a reflection loss; and wherein the main part of said photonic crystal medium includes a point-defect waveguide, and the area disposed on the incident side or the outgoing side of said photonic crystal medium is a line-defect waveguide.