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多波长同时照明的菲涅耳域非相干叠层衍射成像
Incoherent ptychography in Fresnel domain with simultaneous multi-wavelength illumination
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摘要: 传统的叠层衍射成像往往采用单波长照明，即使使用多波长来提升恢复质量也是采用依次照明的方式，同时对相干性要求很高。非相干光照明一直被认为不利于衍射成像。本文提出了一种多波长同时照明的非相干叠层衍射成像方案及相应的多路复用叠层衍射成像算法，并通过仿真和实验验证了该方案的可行性。相比于传统的相干叠层衍射成像方案，该方案不仅能够很好地恢复物像，同时也能够恢复不同波长下分别对应的物体的光谱响应、复振幅探针和光谱比例，从而获得更多的物体信息，具有多通道和多光谱的优势。同时，通过彩色图像编码的方式，能够实现物体的真彩色复原和图像质量的增强。此外，还证明了该算法具有很强的鲁棒性，研究了最多可分辨波长的数量。该研究结果为叠层衍射成像技术的信息多路复用及多光谱成像在更多领域的应用展现了可能性。Abstract: Single wavelength illumination is used in the traditional ptychography. Even though using multi-wavelength to improve image quality, it takes the scheme of illuminating in turn due to the requirement of coherence. So far, the addition of incoherent modes has been regarded as a nuisance in diffractive imaging. Here we propose a scheme of incoherent ptychography and an algorithm of information multiplexing that uses the multi-wavelength illumination simultaneously, which are demonstrated in experiment and simulation. Compared with the scheme of traditional ptychography, it can recover not only the object well, but also the spectral response of the object, probes of complex value and spectral weight of each wavelength respectively. This method obtains much information about the object and owns the multichannel and multispectral merits. Meanwhile, by means of color image coding, this method can retrieve true color images and enhance the image quality. The proposed algorithm has strong robustness. Besides, we also investigate how many modes can be recovered by this method. The work may open up possibilities for information multiplexing in ptychography and multispectral microscopy imaging over various applications.
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