Topological Optical Waveguiding of Exciton-Polariton Condensates

1D models with topological non-trivial band structures are a simple and effective way to study novel and exciting concepts in topological photonics. In this work, the propagation of light-matter quasi-particles, so-called exciton-polaritons, is studied in waveguide arrays. Specifically, topological states are being investigated at the interface between dimer chains, characterized by a non-zero winding number. In order to exercise precise control over the polariton propagation, non-resonant laser excitation, as well as resonant excitation, are studied in transmission geometry. The results highlight a new platform for the study of quantum fluids of light and non-linear optical propagation effects in coupled semiconductor waveguides.