Batey Darren J, Claus Daniel, Rodenburg John M
Department of Electrical and Electronic Engineering, University of Sheffield, S1 3JD Sheffield, UK.
Department of Electrical and Electronic Engineering, University of Sheffield, S1 3JD Sheffield, UK.
Ultramicroscopy. 2014 Mar;138:13-21. doi: 10.1016/j.ultramic.2013.12.003. Epub 2013 Dec 31.
We show for the first time that ptychography (a form of lensless diffractive imaging) can recover the spectral response of an object through simultaneous reconstruction of multiple images that represent the object's response to a particular mode present in the illumination. We solve the phase problem for each mode independently, even though the intensity arriving at every detector pixel is an incoherent superposition of several uncorrelated diffracted waves. Until recently, the addition of incoherent modes has been seen as a nuisance in diffractive imaging: here we show that not only can the difficulties they pose be removed, but that they can also be used to discover much more information about the object. If the illumination function is also mode-specific, we show that we can also solve simultaneously for a multiplicity of such illumination modes. The work opens exciting possibilities for information multiplexing in ptychography over all visible, X-ray and electron wavelengths.
我们首次表明，叠层成像术（一种无透镜衍射成像形式）能够通过同时重建多个图像来恢复物体的光谱响应，这些图像代表了物体对照明中特定模式的响应。我们独立解决每个模式的相位问题，尽管到达每个探测器像素的强度是几个不相关衍射波的非相干叠加。直到最近，非相干模式的叠加在衍射成像中都被视为一种麻烦：在这里我们表明，它们带来的困难不仅可以消除，而且还可用于发现关于物体的更多信息。如果照明函数也是模式特定的，我们表明我们还可以同时求解多种此类照明模式。这项工作为在所有可见光、X射线和电子波长下的叠层成像术中进行信息复用开辟了令人兴奋的可能性。
