arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.13652physics.optics
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用于螺旋相位干涉散射显微镜的点扩散函数工程可实现鲁棒的3D单粒子追踪

Point spread function engineering for spiral phase interferometric scattering microscopy enables robust 3D single-particle tracking

Nathan J. Brooks, Chih-Chen Liu, Chia-Lung Hsieh

AI总结:

针对iSCAT显微镜3D追踪中轴向移动时SNR快速振荡的问题,提出基于后瞳面工程的螺旋相位掩模策略,实现稳定SNR与增强的定位性能,并通过数值和实验验证了其在高速3D追踪等方面的应用。

摘要:

干涉散射(iSCAT)显微镜是目前实现高灵敏度单粒子定位的最强大技术之一。该能力通过零差检测实现,其中与参考波的干涉有望实现极其精确的三维(3D)定位。然而,迄今为止,iSCAT在3D追踪中的实际应用受限于粒子沿轴向移动时信噪比(SNR)的快速振荡。本研究提出了一种基于后瞳面工程的新策略,即使用螺旋相位掩模将粒子散射场的相位在相空间中均匀重新分布,从而确保粒子在整个焦体积内移动时SNR保持一致。研究结果表明,这种改进的螺旋相位iSCAT的可定位特性得到了极大增强。我们通过数值模拟和实验验证了理论结果,展示了该方法在高精度、超高速(20000帧每秒)3D追踪以及自由扩散纳米颗粒表征方面的实际应用。

英文摘要:

Interferometric scattering (iSCAT) microscopy is currently among the most powerful techniques available for achieving high-sensitivity single-particle localization. This capability is realized through homodyne detection, where interference with a reference wave offers the promise of exceptionally precise three-dimensional (3D) localization. However, the practical application of iSCAT to 3D tracking has to date been hampered by rapid oscillations in the signal-to-noise ratio (SNR) as particles move along the axial direction. In this study, we introduce a novel strategy based on back pupil plane engineering, wherein we use a spiral phase mask to re-distribute the phase of the scattered field of the particle uniformly across phase space, thus ensuring consistent SNR as the particle moves throughout the focal volume. Our findings demonstrate that this modified spiral phase iSCAT exhibits greatly enhanced localizability characteristics. We substantiate our theoretical results with numerical and experimental demonstrations, showcasing the practical application of this approach for high-precision, ultrahigh-speed (20,000 frames per second) 3D tracking, and characterization of freely diffusing nanoparticles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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