[论文解读] Purcell-enhanced Bright and Dark Exciton Emission from Perovskite Quantum Dots in Micro-ring Resonators

Lanyin Luo, Mohit Khurana+6 more|arXiv (Cornell University)|Feb 25, 2026

Perovskite Materials and Applications被引用 0

一句话总结

论文展示了CsPbBr3胶体量子点与Si3N4微环谐振器的可扩展集成，以在明态激子和暗态激子上实现Purcell增强发射，并通过选择性QD放置实现与喋喀场模的重叠及片上路由。

ABSTRACT

Colloidal quantum dots (QDs) integrated with waveguide-coupled dielectric resonators are promising building blocks for compact on-chip light sources. However, deterministic placement of QDs with strong mode overlap at the desired location remains a challenge. Here, we demonstrate a simple and scalable strategy for integrating colloidal QDs with a waveguide-coupled Si3N4 micro-ring resonator platform and for controlling the radiative dynamics of both bright and dark excitons via Purcell enhancement. We use strongly quantum-confined CsPbBr3 QDs, which exhibit bright-exciton emission at room-temperature, while emission at cryogenic temperatures originates from both bright and dark excitons. The CsPbBr3 QDs are selectively retained on the Si3N4 micro-ring cavities through a spin-coating/rinsing process, enabling efficient overlap with whispering-gallery modes and routing of the emission through integrated waveguides. We confirm accelerated decay of emission from both bright and dark excitons for CsPbBr3 QDs coupled to the micro-ring cavities. These results demonstrate an effective route to integrate colloidal QDs with Si3N4 micro-ring cavities and to leverage cavity-enhanced emission in scalable integrated photonic devices.

研究动机与目标

• 促成胶体量子点与波导耦合介质谐振器的集成，以实现紧凑的片上光源。
• 展示一种可扩展、选择性放置策略，在微环腔上放置量子点以实现强模场重叠。
• 通过集成平台的Purcell增强，控制明态与暗态激子的辐射动力学。

提出的方法

• 使用在室温发射明态激子的CsPbBr3量子点，在低温下可同时发射明态和暗态激子。
• 通过自旋涂覆和冲洗过程选择性保留在Si3N4微环腔上的量子点，以实现与喋喀场模的高效重叠。
• 将量子点发射耦合到集成波导，并表征两种激子类型的Purcell增强衰减。
• 在与微环腔耦合时，确认明态与暗态激子的发射衰减加速。

实验结果

研究问题

• RQ1 胶体CsPbBr3量子点是否可以被选择性放置在Si3N4微环谐振器上，以最大化模场重叠？
• RQ2 与微环谐振器耦合是否会增强钙钛矿QD中明态和暗态激子的辐射衰减速率？
• RQ3 集成平台是否能在片上波导中传输QD发射，同时保留Purcell增强的发射？
• RQ4 使用自旋涂覆/冲洗法在介电谐振器上实现可扩展的QD集成的有效性如何？

主要发现

• 在微环腔上选择性保留量子点实现与喋喀场模的高效重叠。
• 耦合的CsPbBr3量子点在明态和暗态激子上均表现出Purcell增强的辐射衰减。
• 量子点的发射可以通过片上集成波导在芯片上路由。
• 结果展示了一条将胶体量子点与Si3N4微环腔耦合以实现片上光子器件的可扩展路线。