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The polarizations of topological edge modes in the vicinity of optical Weylpoints were numerically studied in chiral photonic crystals. We investigatedtwo kinds of rotationally stacked woodpile structures in which planar rodarrays were vertically stacked one-by-one with an in-plane rotation angle of 60or 45 degrees. Both structures showed pairs of optical Weyl points havingtopological numbers of opposite signs for photonic bands in low orders.Topological edge states derived from the Weyl points appeared below the lightline, and were strongly confined at the air interfaces in a length shorter thanthe wavelength. Their polarizations in a direction perpendicular to thepropagation direction were found to be one particular circular polarizationthat depended on the handedness of the structural chirality. Since these chiralphotonic crystals can be fabricated using semiconductor materials such as GaAsor Si, the obtained robust planar waveguides for circularly polarized light atthe interface between air and the semiconductor structure can be useful notonly in photonics but also in spintronics or quantum information technologythrough spin-photon interfaces.

Circularly polarized topological edge states derived from optical Weyl points in semiconductor-based chiral woodpile photonic crystals