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<p>The realization of strong coupling at the single-emitter level marks a critical milestone for advancing quantum information technologies. While this phenomenon has been predominantly demonstrated under cryogenic conditions, its extension to room-temperature operation between single quantum emitters and dielectric micro/nanostructures remains a fundamental challenge. Here, we report observation of room-temperature strong coupling between colloidal quantum dots and a hybrid dielectric microcavity through angle-resolved photoluminescence spectroscopy. Notably, we demonstrate strong coupling at the single quantum dot level with dielectric microstructures under ambient conditions through photoluminescence measurements. Systematic investigations are conducted on two key aspects: the formation of bound states in the continuum in wide-width waveguides (10–30 μm), and the vacuum Rabi splitting characteristics of colloidal quantum dots coupled to these dielectric Fabry-Pérot microcavities in the vertical direction of waveguide of the hybrid material. The micrometer-scale waveguide dimensions employed in this work enable straightforward fabrication using standard photolithographic techniques.</p>

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Rabi splitting observed from quantum dots coupled to dielectric Fabry-Pérot microcavity at room temperature

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月28日

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  • Xingsheng Xu,
  • Siyue Jin,
  • Zhen Zhen,
  • Jie Ren

摘要

The realization of strong coupling at the single-emitter level marks a critical milestone for advancing quantum information technologies. While this phenomenon has been predominantly demonstrated under cryogenic conditions, its extension to room-temperature operation between single quantum emitters and dielectric micro/nanostructures remains a fundamental challenge. Here, we report observation of room-temperature strong coupling between colloidal quantum dots and a hybrid dielectric microcavity through angle-resolved photoluminescence spectroscopy. Notably, we demonstrate strong coupling at the single quantum dot level with dielectric microstructures under ambient conditions through photoluminescence measurements. Systematic investigations are conducted on two key aspects: the formation of bound states in the continuum in wide-width waveguides (10–30 μm), and the vacuum Rabi splitting characteristics of colloidal quantum dots coupled to these dielectric Fabry-Pérot microcavities in the vertical direction of waveguide of the hybrid material. The micrometer-scale waveguide dimensions employed in this work enable straightforward fabrication using standard photolithographic techniques.