Pietersoone Emilie, Létang Jean Michel, Rit Simon, Langer Max
Opt Lett. 2024 Oct 1;49(19):5431-5434. doi: 10.1364/OL.523608.
We present a new, to the best of our knowledge, method to simulate diffraction images accounting for both coherent and incoherent effects, based on the Wigner distribution function of the exit wave. This permits the simulation of wave and particle effects simultaneously and simulates images photon by photon. It is motivated by artifacts observed in x ray phase-contrast images after phase retrieval, present as noise in the low spatial frequency range, which can make analysis of such images challenging. Classical simulations have so far not been able to reproduce these artifacts. We hypothesize that these artifacts are due to incoherent scatter present in the images, hence the interest in developing a simulator that permits the simulation of both diffraction and incoherent scattering. Here, we give a first demonstration of the method by simulating the Gaussian double-slit experiment. We demonstrate the capability of combining diffraction and incoherent scattering, as well as simulating images for any propagation distance.
据我们所知，我们提出了一种基于出射波的维格纳分布函数来模拟考虑相干和非相干效应的衍射图像的新方法。这允许同时模拟波动和粒子效应，并逐个光子地模拟图像。其动机源于在相位恢复后的X射线相衬图像中观察到的伪影，这些伪影在低空间频率范围内表现为噪声，这会使对此类图像的分析具有挑战性。到目前为止，经典模拟还无法重现这些伪影。我们推测这些伪影是由于图像中存在的非相干散射，因此有兴趣开发一种能够模拟衍射和非相干散射的模拟器。在此，我们通过模拟高斯双缝实验首次演示了该方法。我们展示了结合衍射和非相干散射的能力，以及模拟任意传播距离图像的能力。
