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Nanocavity-Enhanced Second-Harmonic Generation from Colossal Quantum Dots

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arxiv 2503.03072 v1 pith:4X3SBFSU submitted 2025-03-05 physics.optics physics.app-ph

Nanocavity-Enhanced Second-Harmonic Generation from Colossal Quantum Dots

classification physics.optics physics.app-ph
keywords colossalgenerationnonlinearopticsdeterministicdotsharmonicintegration
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Colloidal quantum dots (QDs) are an attractive medium for nonlinear optics and deterministic heterogeneous integration with photonic devices. Their intrinsic nonlinearities can be strengthened further by coupling QDs to low mode-volume photonic nanocavities, enabling low-power, on-chip nonlinear optics. In this paper, we demonstrated cavity-enhanced second harmonic generation via integration of colossal QDs with a silicon nitride nanobeam cavity. By pumping the cavity-QD system with an ultrafast pulsed laser, we observed a strong second harmonic generation from the cavity-coupled QD, and we estimate an enhancement factor of ~3,040. Our work, coupled with previously reported deterministic positioning of colossal QDs, can enable a scalable QD-cavity platform for low-power nonlinear optics.

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