AI 中文总结
该研究针对实验室光源下叠层成像受低光子通量与宽动态范围限制的问题，提出多尺度非线性融合方法，突破严格线性度限制，实现稳健成像并拓宽光谱带宽，提升台式纳米显微镜的保真度。
AI 中文摘要
叠层成像术（Ptychography）是一种强大的无透镜成像技术，它突破了传统数值孔径限制，可达到衍射极限分辨率。尽管该技术在高亮度同步辐射装置中已常规应用，但其在实验室规模光源上的应用主要受限于低光子通量。在这种条件下，衍射信号的宽动态范围成为关键瓶颈，探测器的位深限制阻碍了低频强度与高频细节的同时记录。目前，大多数高动态范围（HDR）成像方法要求严格的辐射线性度，假设融合后的强度必须与波前的模平方成正比，以满足泊松似然模型。本文在叠层成像流程中引入多尺度非线性融合方法，证明严格线性度并非准确重建的必要前提。该方法缓解了噪声抑制与物理保真度之间的传统权衡，可在强色散下实现稳健成像，并显著拓宽有效光谱带宽。
英文摘要
Ptychography is a powerful lensless imaging technique that overcomes conventional numerical aperture limits to achieve diffraction-limited resolution. While routine at high-brilliance synchrotron facilities, its application to laboratory-scale sources is primarily limited by low photon flux. Under these conditions, the wide dynamic range of diffraction signals presents a critical bottleneck where detector bit-depth limitations hinder the simultaneous recording of low-frequency intensity and high-frequency details. Currently, most high-dynamic-range (HDR) imaging methods enforce strict radiometric linearity, assuming the fused intensity must be linearly proportional to the squared modulus of the wavefront to satisfy Poisson likelihood models. In this paper, we introduce a multi-scale non-linear fusion approach into the ptychographic pipeline, demonstrating that strict linearity is not a prerequisite for accurate reconstruction. This method mitigates the traditional trade-off between noise suppression and physical fidelity, enables robust imaging under strong dispersion, and significantly broadens the effective spectral bandwidth.
Comments11 pages, 4 figures
