Claus Daniel, Rodenburg John Marius
J Opt Soc Am A Opt Image Sci Vis. 2019 Feb 1;36(2):A12-A19. doi: 10.1364/JOSAA.36.000A12.
Superresolution in lensless near-field ptychography is demonstrated via the application of a strongly curved illumination function. The reconstruction is performed using the Rayleigh-Sommerfeld diffraction integral, which is implemented via a pixel-size adjustable angular spectrum method. In this manner, the reconstructed object details, which are not only smaller than the pixel size of the sensor but even smaller than the smallest resolvable object detail defined by the effective NA of the 2D sensor, are enabled. The expected resolution, as predicted by the angles of scatter present in the optical configuration, is experimentally validated using a US air force resolution test target. The approach discussed here is not limited to ptychography; it can be extended to other coherent diffractive imaging modalities such as object scanning holography or optical diffraction tomography, so as to enable high-resolution near-field quantitative phase imaging.
通过应用强弯曲照明函数，在无透镜近场叠层成像中实现了超分辨率。使用瑞利 - 索末菲衍射积分进行重建，该积分通过像素大小可调的角谱方法实现。通过这种方式，可以实现重建的物体细节，这些细节不仅小于传感器的像素大小，甚至小于由二维传感器的有效数值孔径定义的最小可分辨物体细节。利用美国空军分辨率测试靶对光学配置中存在的散射角所预测的预期分辨率进行了实验验证。这里讨论的方法不限于叠层成像；它可以扩展到其他相干衍射成像模式，如物体扫描全息术或光学衍射层析成像，从而实现高分辨率近场定量相位成像。
