Abstract
Unidirectional light propagation, as in the emerging field of topological photonics, offers robust transport of light in devices despite the presence of fabrication flaws. This highly nontrivial effect, however, can only be achieved in correspondingly nontrivial structures. The authors present a significantly simplified paradigm in which dynamic modulation of a photonic waveguide conducts light in one direction, even through structural defects. This approach opens an avenue to exploring topological photonics, and to slow-light waveguides unhindered by their imperfections, which is exciting for applications in integrated optics.
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