Two-dimensional triangular lattice photonic crystal mode division multiplexing and demultiplexing device based on magneto-optic effect

The invention relates to a two-dimensional triangular lattice photonic crystal mode division multiplexing/demultiplexing device based on a magneto-optic effect. Two-dimensional triangular lattice medium post photonic crystals (1) are photonic crystals distributed periodically along an X-Z plane; square medium posts of the photonic crystals are arrayed according to a triangular lattices; the medium posts are made of silicon; a background material is air; an input main waveguide area (2) is formed by removing a row of medium posts; a TE mode output waveguide area (3) is formed by a row of TbYbBiIG medium posts; and a TM mode output waveguide area (4) is formed by three rows of medium posts filled with magneto-optic TbYbBiIG materials. The TE mode output waveguide area and the TM mode output waveguide area are located on the right side and the upper side of the input main waveguide area respectively, and the input main waveguide area is a mode demultiplexing area.