High-quality reconstruction of coherent modulation imaging using weak cascade modulators
| Autor: | Bingyang Wang, Zhenfei He, Jiaming Bai, Fucai Zhang, George Barbastathis |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
02 engineering and technology
01 natural sciences Amplitude modulation Optics X-Ray Diffraction Robustness (computer science) 0103 physical sciences Image Processing Computer-Assisted Computer Simulation Microscopy Interference Microscopy Phase-Contrast Instrumentation 010302 applied physics business.industry Reconstruction algorithm 021001 nanoscience & nanotechnology Image Enhancement Coherent diffraction imaging Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Modulation Cascade 0210 nano-technology Phase retrieval business Phase modulation Algorithms |
| Zdroj: | Ultramicroscopy. 214 |
| ISSN: | 1879-2723 |
| Popis: | Coherent modulation imaging (CMI) has been shown to be an effective lensless diffraction approach to imaging general extended samples with fast algorithmic convergence and high robustness to data imperfection. Being a single-shot technique, CMI holds a high potential for imaging dynamics with ultrafast pulses like the ones from free-electron lasers. In the reported work, strong modulators have been suggested for CMI to have the optimal performance, which may be an obstacle for the wide adoption of the method. Here we show that with our improved reconstruction algorithm the requirements on the modulation depth and feature size of a modulator can be relaxed. Furthermore, we demonstrate that when cascade configuration is used, the modulators can be even weaker while providing lower image errors in reconstruction than the case of a single modulator. Detailed numerical studies in both far-field and near-field experiment geometry are given via simulation. A relaxed requirement on modulators in CMI could pave the way for its wide use in biology and materials science. |
| Databáze: | OpenAIRE |
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