Lensless coherent imaging by a deterministic phase retrieval method with an aperture-array filter.
Lensless coherent imaging by a deterministic phase retrieval method with an aperture-array filter.
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DOI：
10.1364/josaa.25.000742
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
N. Nakajima
中科院分区：
文献类型：
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作者：
N. Nakajima
最近，我们提出了一种非迭代和解析相位检索方法，使用孔径阵列的滤波器从衍射强度图案重建复值物体[Phys。 Rev. Lett.98, 223901 (2007)]，但该方法在强度测量时受到物体与滤光片之间以及滤光片与探测器之间两个距离的远场条件的限制。本文提出了一种改进方法，将这些距离的适应条件扩展到菲涅耳衍射区域。此外，还提出了一种减少噪声对相位恢复影响的方法，其中利用了单一强度分布的多组采样数据中包含的相位信息。该方法的实用性在计算机模拟的对象重建示例中得到了体现，其中包括具有相位涡旋的对象。
Recently we have proposed a noniterative and analytic phase retrieval method using the filter of an aperture array to reconstruct a complex-valued object from a diffraction intensity pattern [Phys. Rev. Lett.98, 223901 (2007)], but this method suffers from the restriction of the far-field condition of two distances between the object and the filter and between the filter and the detector for the intensity measurement. An improved method, which extends the adaptable condition of those distances to the region of Fresnel diffraction, is proposed here. In addition, the procedure for reducing the influence of noises on the phase retrieval is presented, in which the phase information contained in multiple groups of sampling data of a single intensity distribution is utilized. The usefulness of this method is shown in computer-simulated examples of the object reconstructions, including an object with phase vortices.