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    科学领域:

    • 生物医学成像技术 生物医学成像技术
    • 显微镜技术 显微镜技术
    • 光学物理学 光学物理学

    背景情况:

    • 双光子激发光 (2PEF) 显微镜是生物样品的领先的非线性成像方法.
    • 当前的2PEF方法依赖于排放歧视,当光体排放光谱重叠时,这可能导致光子损失和交叉交谈问题.
    • 当前2PEF的局限性包括由于过器范围之外的固有光子损失导致的成像效率和速度降低.

    研究的目的:

    • 开发一种替代的2PEF方法,克服排放歧视的局限性.
    • 引入一种新的方法来根据其激发光谱来区分光体.
    • 为了提高成像效率并减少2PEF显微镜中的交叉谈话.

    主要方法:

    • 开发了一种频率编码的2PEF (FE-2PEF) 技术,使用两种具有不同波长 (ω1, ω2) 的激光.
    • 产生的激发能量包括2ω1,2ω2和混合能量 ω1+ω2.2.
    • 为所有2PEF发射使用单个探测器,激光通过强度调制进行频率编码. 信号解调使用锁定放大器,然后进行定制的非负矩阵因子化 (NNMF) 来生成图像.

    主要成果:

    • 展示了2PEF显微镜的新兴激发歧视方法.
    • 使用NNMF实现了无交叉交谈的光图像.
    • 在FE-2PEF方法收集所有发射的光子在单个探测器,提高效率.

    结论:

    • FE-2PEF显微镜为传统的排放歧视提供了替代方案,提高了成像效率和速度.
    • 这种方法可以有效地区分具有类似排放配置文件的光体.
    • 将FE-2PEF与多个探测器相结合,可以同时对显著更高数量的光体进行成像.