AUTHOR=Wang Xinyue , Zhao Wen , Zhang Hongyu , Elshahat Sayed , Lu Cuicui TITLE=Magnetic-Optic Effect-Based Topological State: Realization and Application JOURNAL=Frontiers in Materials VOLUME=8 YEAR=2022 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.816877 DOI=10.3389/fmats.2021.816877 ISSN=2296-8016 ABSTRACT=

The topological state in photonics was first realized based on the magnetic-optic (MO) effect and developed rapidly in recent years. This review summarizes various topological states. First, the conventional topological chiral edge states, which are accomplished in periodic and aperiodic systems based on the MO effect, are introduced. Some typical novel topological states, including valley-dependent edge states, helical edge states, antichiral edge states, and multimode edge states with large Chern numbers in two-dimensional and Weyl points three-dimensional spaces, have been introduced. The manifest point of these topological states is the wide range of applications in wave propagation and manipulation, to name a few, one-way waveguides, isolator, slow light, and nonreciprocal Goos–Hänchen shift. This review can bring comprehensive physical insights into the topological states based on the MO effect and provides reference mechanisms for light one-way transmission and light control.