Wave propagation and phase retrieval in Fresnel diffraction by a distorted-object approach
Wave propagation and phase retrieval in Fresnel diffraction by a distorted-object approach
复制标题
通过扭曲物体方法进行菲涅尔衍射中的波传播和相位恢复
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Q. Shen
中科院分区：
文献类型：
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作者：
Xianghui Xiao;Q. Shen
远场X射线衍射理论的扩展是通过引入扭曲的对象来计算近场菲涅尔机制中相干衍射模式的。它在原始对象上嵌入了菲涅尔区构造，形成了相相变形的对象，然后将其转换为傅立叶形成衍射图像。这种方法扩展了基于傅立叶的迭代分量算法的适用性，该算法很难进行相位检索。这种近场检索方法的模拟数值示例表明其在非晶体材料的高分辨率结构研究中的潜在应用。
An extension of the far-field x-ray diffraction theory is presented by the introduction of a distorted object for calculation of coherent diffraction patterns in the near-field Fresnel regime. It embeds a Fresnel-zone construction on an original object to form a phase-chirped distorted object, which is then Fourier transformed to form a diffraction image. This approach extends the applicability of Fourier-based iterative phasing algorithms into the near-field holographic regime where phase retrieval had been difficult. Simulated numerical examples of this near-field phase retrieval approach indicate its potential applications in high-resolution structural investigations of noncrystalline materials.