High-speed ptychographic imaging based on multiple-beam illumination
High-speed ptychographic imaging based on multiple-beam illumination
复制标题
基于多光束照明的高速叠印成像。
DOI：
10.1364/oe.26.025869
复制
发表时间：
2018-10-01
期刊：
影响因子：
3.8
通讯作者：
Zhu, Jianqiang
中科院分区：
文献类型：
--
作者：
He, Xiaoliang;Veetil, Suhas P.;Zhu, Jianqiang
重叠关联成像是一种无透镜相位成像技术，其通过相对于局部照明光束在若干点处扫描样本来获得图像。对于较大的样本，完成扫描需要较长的时间，因此在设置中需要更高的稳定性，而这通常无法保证。这里提出了一种替代技术，减少了这种应用程序的顺序扫描时间。针孔阵列用于产生多个微小的空间分离光束，以在不同点处同时扫描物体。所产生的衍射图案被记录并在菲涅耳区域中处理以获得图像。与其他使用多光束的重叠关联方法不同，所提出的方法不需要使用多模重叠关联算法或衍射图案的自相关滤波。通过仿真和实验研究了该方法的有效性。与传统的单光束重叠关联成像相比，所提出的方法能够在保持扫描位置数量不变的情况下实现更大的视场。
Ptychography is a lensless phase imaging technique that obtains an image by scanning a specimen at several points with respect to a localized illumination beam. For larger specimens, it takes a longer time to complete scanning and hence higher stability is required in the setup which is often not guaranteed. An alternative technique is proposed here that reduces the sequential scanning time for such applications. A pinhole array is used to generate multiple tiny spatially separated beams to scan an object simultaneously at various points. The resulting diffraction patterns are recorded and processed in the Fresnel regime to obtain the images. Unlike other ptychographic methods using multiple beams, the proposed method does not require the use of a multimode ptychography algorithm or autocorrelation filtering of the diffraction patterns. The effectiveness of the method is studied through simulations and experiments. In contrast to conventional single-beam ptychography, the proposed method has the ability to achieve a larger field of view while leaving the number of scanned positions unchanged.