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arXiv · 2606.22626

Integrated Whispering-Gallery Microlaser-Waveguide Platform for On-Chip Electrical Excitation of InGaAs Quantum Dots

Léo J. Roche·Peter Gschwandtner·Chirag C. Palekar·Setthanat Wijitpatima·Yuhui Yang·Monika Emmerling·Sven Höfling·Tobias Huber-Loyola·Stephan Reitzenstein
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Abstract

We report the fabrication and characterization of an integrated quantum photonic device consisting of an electrically driven whispering-gallery-mode micropillar laser evanescently coupled to a ridge waveguide, both incorporating InGaAs quantum dots (QDs). The lasing characteristics of microlasers are systematically investigated as a function of the pillar-waveguide gap distance. Coherent emission from the whispering-gallery-mode microlaser coupled into the waveguide enables on-chip optical excitation of QDs embedded in an electrically contacted micropillar at the end of the waveguide. Under continuous-wave on-chip excitation, we observe single-photon emission with $g^{(2)}(0) = (3.49 \pm 0.01) \%$ for a QD integrated in the outcoupling micropillar which can be spectrally tuned-by the quantum confined Stark effect. These results constitute an important step toward low-footprint, deterministic, and scalable single-photon sources for QD-based integrated quantum photonic circuits.

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Léo J. Roche, Peter Gschwandtner, Chirag C. Palekar, Setthanat Wijitpatima, Yuhui Yang, Monika Emmerling, Sven Höfling, Tobias Huber-Loyola, Stephan Reitzenstein. 2026-06-21. Integrated Whispering-Gallery Microlaser-Waveguide Platform for On-Chip Electrical Excitation of InGaAs Quantum Dots. https://arxiv.org/abs/2606.22626

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