GaAs valley photonic crystal waveguide with light-emitting InAs quantum dots

Abstract

We report a valley photonic crystal (VPhC) waveguide in a GaAs slab with InAs quantum dots (QDs) as an internal light source exploited for experimental characterization of the waveguide. A topological interface state formed at the interface between two topologically-distinct VPhCs is used as the waveguide mode. We demonstrate robust propagation for near-infrared light emitted from the QDs even under the presence of sharp bends as a consequence of the topological protection of the guided mode. Our work will be of importance for developing robust photonic integrated circuits with small footprints, as well as for exploring active semiconductor topological photonics.

arXiv comment14 pages, 4 figures

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• Topologically protected Fano resonance in photonic valley Hall insulators
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• High Transmission in 120-degree Sharp Bends of Inversion-symmetric and Inversion-asymmetric Photonic Crystal Waveguides
• Hybrid Si-GaAs photonic crystal cavity for lasing and bistability
• Valley photonic crystal waveguides fabricated with CMOS-compatible process
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