利用等离子体纳米结构调控单纳米晶体中的光子雪崩阈值
Engineering Photon Avalanche Thresholds in Single Nanocrystals with Plasmonic Nanostructures
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中文总结 AI 辅助
本研究利用金属纳米结构的电磁场增强，将光子雪崩纳米晶体的激发功率密度降低10倍以上，为低激发功率超分辨成像探针的开发奠定基础。
中文摘要 AI 辅助
光学超分辨成像已成为现代研究的重要工具。近期，一种新的成像策略被提出，该策略利用掺杂稀土的纳米晶体在光子雪崩（PA） regime下的强非线性激发-发射响应，具有光学仪器简单、近红外激发与发射、低细胞毒性、高光稳定性等优势。然而，其实际应用受限于启动PA过程所需的较高激发功率密度（10-100 kW/cm²）。本研究旨在通过金属纳米结构提供的电磁场增强缓解该限制。对耦合到银岛膜的单个光子雪崩纳米晶体的显微研究结果表明，触发雪崩发射所需的激发功率密度降低了10倍以上。这些实验结果经数值模拟验证，阐明了等离子体介导的电磁场增强在改变光子雪崩动力学中的作用，为新一代用于超分辨成像和传感的低激发功率探针铺平了道路。
英文摘要
Optical sub-diffraction imaging has become an essential tool in modern research. Recently, a new imaging strategy has been demonstrated that exploits the strongly nonlinear excitation-emission response of rare-earth-doped nanocrystals operating in the photon avalanche (PA) regime. This approach benefits from simple optical instrumentation, near-infrared excitation and emission, low cytotoxicity, and high photostability. However, its practical implementation is hindered by relatively high (10-100s of kW/cm2) excitation power densities required to initiate the PA process. We aim to mitigate this limitation through electromagnetic field enhancement provided by metallic nanostructures. The results of microscopic studies of individual photon-avalanching nanocrystals coupled to a silver island film demonstrate a greater than tenfold reduction in the excitation power density required to trigger the avalanche emission. These experimental results, corroborated by numerical modelling, which elucidates the role of plasmon-mediated electromagnetic field enhancement in modifying the photon avalanche dynamics, paves the way towards new generation of low excitation power probes for sub-diffraction imaging and sensing.
发表机构
- Nicolaus Copernicus University in Toruń（托伦哥白尼大学）
- Institute of Advanced Studies, Nicolaus Copernicus University in Toruń（托伦哥白尼大学高级研究所）
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences（波兰科学院低温结构研究所）
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