“Topological photonics” (2019), by Tomoki Ozawa et al. Physics and Astronomy research paper. Original abstract below, unchanged. A free PDF is available.

Topological photonics

Tomoki Ozawa, Hannah M. Price, Alberto Amo et al. · March 25, 2019 · Physics and Astronomy

Abstract

The robustness of the integer quantum Hall effect of electron systems is due to the existence of a topological invariant that characterizes the variation of the electron wave function over the Brillouin zone. Topological phenomena are generic features of waves in periodic media, and this article reviews how photonic systems such as waveguide arrays and photonic metamaterials allow exploration and application of topological effects in new physical regimes and in new devices.

Free PDF DOI: 10.1103/revmodphys.91.015006