Engineering Nanohole-Etched Quantum Dots for Telecom-Band Single-Photon Generation.

ABSTRACT: Bright and high-purity single-photon sources at telecom wavelengths are essential for scalable quantum networks. Nanohole-etched GaSb/AlGaSb quantum dots (QDs) are an emerging platform for telecom-band emitters, offering freedom from strain-induced decoherence and indium-related nuclear spin noise of conventional InGaAs QDs. Here, we present a comprehensive optical spectroscopy study that reveals correlations between nanohole morphology, exciton recombination dynamics, and single-photon performance in GaSb QDs. Shallow nanoholes lead to ultrafast charge transfer that limits optical coherence, whereas deeper nanoholes yield clean neutral-exciton emission with a high bright-to-dark state branching ratio (98 ± 1%), indicating favorable conditions for efficient photon generation. Under pulsed

SUBMITTER: Masson IM 

PROVIDER: S-EPMC12854758 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature