Fano-resonance in one-dimensional topological photonic crystal heterostructure.

We theoretically realize the Fano resonance with a high quality factor of 10(6) using a structure, which is constructed from three one-dimensional photonic crystals and a defect layer. The emerged Fano resonance can be attributed to the weak coupling between a Fabry-Perot cavity mode and a topological edge state mode provided by the topological photonic crystal heterostructure. Moreover, we experimentally reproduce this Fano resonance in the optical communication range with a high quality of 10(4). This may be useful reference for the study of applications of photonic topological states in integrated photonic devices and information processing chips. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement