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<p>Quantum dot (QD) lasers exhibit exceptional promise in optical communication, laser display, and biomedical diagnostic applications. However, the toxicity of heavy metals in II–VI QDs has impeded their broader deployment. Herein, red-emitting InP QDs bearing a gradient ZnSeS alloy shell were synthesized to suppress Auger recombination and thereby attain a lasing threshold as low as 32.1 µJ/cm<sup>2</sup>. A capillary-bridge confined self-assembly method was employed to arrange these InP QDs into high-density micro-ring resonator arrays with resolutions exceeding 1000 ppi (ppi: proton pump inhibitor). Systematic variation of the microring diameter enabled modulation of the lasing mode structure, and single-mode lasing was realized in 6 µm rings under defined pumping conditions. This work establishes a heavy-metal-free platform for scalable, high-resolution quantum dot laser arrays.</p>

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High-resolution and Tunable Red Indium Phosphide Quantum Dot Microlaser Arrays

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Ke He,
  • Hui Li,
  • Ning Guo,
  • Yuchen Wu

摘要

Quantum dot (QD) lasers exhibit exceptional promise in optical communication, laser display, and biomedical diagnostic applications. However, the toxicity of heavy metals in II–VI QDs has impeded their broader deployment. Herein, red-emitting InP QDs bearing a gradient ZnSeS alloy shell were synthesized to suppress Auger recombination and thereby attain a lasing threshold as low as 32.1 µJ/cm2. A capillary-bridge confined self-assembly method was employed to arrange these InP QDs into high-density micro-ring resonator arrays with resolutions exceeding 1000 ppi (ppi: proton pump inhibitor). Systematic variation of the microring diameter enabled modulation of the lasing mode structure, and single-mode lasing was realized in 6 µm rings under defined pumping conditions. This work establishes a heavy-metal-free platform for scalable, high-resolution quantum dot laser arrays.