Acousto-optic ptychography
Acousto-optic ptychography
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DOI：
10.1364/optica.424828
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发表时间：
2021-06-20
期刊：
影响因子：
10.4
通讯作者：
Katz, Ori
中科院分区：
文献类型：
--
作者：
Rosenfeld, Moriya;Weinberg, Gil;Katz, Ori
声学成像（AOI）通过散射光的局部超声调节在散射样品内部进行光对比度成像。虽然AOI允许在深度进行光学研究，但其成像分辨率固有地受到超声波长的限制，从而禁止显微研究。在这里，我们提出了一种计算成像方法，该方法允许使用常规AOI系统进行光学衍射限制成像。我们通过从常规检测到的超声调制散射光场中的斑点相关性提取衍射受限的成像信息来实现这一目标。具体而言，我们确定，由于“内存效应”斑点相关性允许估计超声焦点内部陆场的傅立叶幅度，因此扫描超声焦点可以实现强大的衍射限制重建扩展对象的重建（即，我们利用超声焦点焦点作为ptychographic阶段检索所需的扫描空间探针）。此外，我们在动态介质中利用短斑点去相关时间，通常被认为是基于波浪形的方法的障碍，以改善ptychographic重建。我们在实验上证明了靶标的无创成像，这些目标远远超出了记忆效应范围，比传统的AOI有40倍的分辨率改进。 （c）2021美国光学学会根据OSA开放访问发布协议条款
Acousto-optic imaging (AOI) enables optical-contrast imaging deep inside scattering samples via localized ultrasound-modulation of scattered light. While AOI allows optical investigations at depths, its imaging resolution is inherently limited by the ultrasound wavelength, prohibiting microscopic investigations. Here, we propose a computational imaging approach that allows optical diffraction-limited imaging using a conventional AOI system. We achieve this by extracting diffraction-limited imaging information from speckle correlations in the conventionally detected ultrasound-modulated scattered-light fields. Specifically, we identify that since "memory-effect" speckle correlations allow estimation of the Fourier magnitude of the field inside the ultrasound focus, scanning the ultrasound focus enables robust diffraction-limited reconstruction of extended objects using ptychography (i.e., we exploit the ultrasound focus as the scanned spatial-gate probe required for ptychographic phase retrieval). Moreover, we exploit the short speckle decorrelation-time in dynamic media, which is usually considered a hurdle for wavefront-shaping- based approaches, for improved ptychographic reconstruction. We experimentally demonstrate noninvasive imaging of targets that extend well beyond the memory-effect range, with a 40-times resolution improvement over conventional AOI. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement