Enhancement of graphene Faraday rotation in the one-dimensional topological photonic crystals.

One-dimensional topological photonic crystals (TPCs) with graphene sheet have been proposed to enhance the Faraday rotation (FR). Because of the strong localized field of the topological interface state, the enhanced FR angle with high transmittance has been confirmed. The effects of external magnetic field, unit cell number and multiple interface states of multilayers on FR angle and transmittance are studied. As a result, the FR is raised, which shows a field enhancement constraint at the interface between the TPCs with graphene. The FR angle can reach 16.2 degrees with the high transmission (70%). By constructing multiple interface states, multiple transmission peaks and FR angles are further achieved. Our result would give a fresh idea, which could be applied in nonreciprocal photonic device or optical communication systems. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement