Influence of boundary conditions on the one-way edge modes in two-dimensional magneto-optical photonic crystals

The influence of boundary conditions on the one-way edge modes in two-dimensional magneto-optical photonic crystals is studied theoretically by the supercell method. The numerical results reveal that tailoring the boundary could bring some new properties, but would not change the intrinsic one-way character for edge modes in the band gap generally. Changing the boundary conditions, more than one edge modes and waveguide modes can appear, which could couple and split into new ones. Two independent channels for one-way edge modes can be realized. The frequency of the edge Dirac point can be tunable.