许子健研究员，博导，长期从事X射线谱学显微方法学发展和数据分析技术研究。建成国内首个X射线扫描相干衍射成像(ptychography)平台，实现了低剂量、高分辨（7nm）、大视场（百微米）、高效率的ptychography方法，有力支持了光源用户的高水平研究工作。先后主持5项国家和上海市自然基金项目，主持1项国家重点研发课题，发表论文70余篇。

1. 高分辨X射线显微方法学
2. X射线相干衍射成像方法学及应用研究
3. 图像恢复/重建算法
4. 同步辐射实验技术及应用

1. 国家重点研发计划课题，“细胞全景结构纳米分辨同步辐射成像技术体系”，课题负责人，2022.12-2027.11
2. 国家自然科学基金面上项目，“基于扫描相干衍射成像技术的新型低剂量三维成像方法研究”，项目负责人，2019.1-2022.12
3. 国家自然科学基金联合基金项目，“软X射线共振散射方法发展及其在有机太阳能电池领域的应用”，项目负责人，2019.1-2021.12
4. 国家自然科学基金面上项目，“X射线扫描相干衍射成像方法学及其应用研究”，项目负责人，2016.1-2019.12
5. 国家自然科学基金青年基金项目，“多孔石墨烯分离膜的粒子束制备及性能研究”，项目负责人，2013.1-2015.12
6. 上海市自然科学基金项目，“碳纳米管材料在核电池辐射场中的损伤与修复机制研究”，项目负责人，2011.4-2014.3
7. 国家重点研发计划课题，“器件内部缺陷的纳米级高分辨成像”，骨干参与，2022.01-2026.12
8. 国家自然科学基金重点项目，“研发10纳米高效率同步辐射软X射线复合波带片透镜关键技术的基础研究”，子课题负责人，2024.1-2028.12
9. 上海市基础研究重点项目，“三维拓扑磁体的物性研究与器件研发”，子课题负责人，2021.10-2024.9

[1]  Shilei Liu; Zijian Xu*; Zhenjiang Xing; Xiangzhi Zhang; et al. Periodic Artifacts Generation ａｎｄ Suppression ｉｎ X-ray Ptychography. Photonics, 2023, 10: 532
[2]  Shilei Liu; Zijian Xu*; Xiangzhi Zhang; et al. Position-guided ptychography for vibration suppression with the aid of a laser interferometer. Opt. Laser Eng., 2023, 160: 107297.
[3]  Zeping Qin; Zijian Xu*; Ruoru Li; Haigang Liu; Shilei Liu; et al. Initial probe function construction ｉｎ ptychography based on zone-plate optics. Applied Optics, 2023, 62: 3542
[4]  Shanshan Chen, Chunying Fan, Zijian Xu, Mengyao Pei, Jiemin Wang, et al. Mechanochemical synthesis of organoselenium compounds. Nature Communications 2024, 15: 769
[5]  Xujie Tong; Yifang Chen; Zijian Xu; Yijie Li; Zhenjiang Xing; et al. High-efficiency focusing ａｎｄ imaging by dielectric kinoform zone plate lenses with soft X-rays. Journal of Synchrotron Radiation, 2023, 30: 319
[6]  Chi Zhang; Haigang Liu; Chunpeng Wang; Zhi Guo; Xiangzhi Zhang; Zijian Xu; Xiangjun Zhen; et al. Automatic Feedback System for X-ray Flux at BL08U1A Soft X-ray Spectromicroscopy Beamline of Shanghai Synchrotron Radiation Facility. Applied Sciences, 2023, 13: 5456.
[7]  Xujie Tong; Yifang Chen; Zijian Xu; Yijie Li; Zhenjiang Xing; et al. Trapezoid-kinoform zone plate lens – a solution for efficient focusing ｉｎ hard X-ray optics. Journal of Synchrotron Radiation 2022, 29: 386.
[8]  Zhenrui Li; Weijin Kong; Yang Yu; Jicheng Zhang; Deniz Wong; Zijian Xu; Zhenhua Chen; et al. Tuning Bulk O2 ａｎｄ Nonbonding Oxygen State for Reversible Anionic Redox Chemistry ｉｎ P2‐Layered Cathodes. Angew. Chem. Int. Ed., 2022, 134(16): e202115552
[9]  Z. Xing, Zijian Xu*, Renzhong Tai, et al. Virtual depth-scan multi-slice ptychography for improved three-dimensional imaging, Optics Express 29, 16214, 2021
[10] T. Sun, Xiangzhi Zhang, Zijian Xu*, Renzhong Tai，et al., A bidirectional scanning method of scanning transmission X-ray microscopy, J. Synchrotron Rad., 28, 512, 2021
[11] Xing Z., Xu Z.*, Tai R., et al. Research on Signal-Noise Separation Algorithm of Ptychography，Acta Optica Sinica 41, 2234001, 2021
[12] L. Ma, Z. Xu, X. Zhang, R. Tai, et al., Three-dimensional fast elemental mapping by soft X-ray dual-energy focal stacks imaging, J. Synchrotron Rad. 28, 924, 2021
[13] Zhenjiang Xing, Zijian Xu*, Xiangzhi Zhang, Haigang Liu, et al. Position correction algorithm combined with Fresnel CDI for Ptychography, Proc. SPIE, 2020, 11571: 115710O
[14] Limei Ma，Xiangzhi Zhang，Zijian Xu*, et al., Three-dimensional focal stack imaging ｉｎ soft X-ray microscopy with an improved reconstruction algorithm. Optics Express 27, 7787-7802 (2019)
[15] Limei Ma, Zijian Xu, Xiangzhi Zhang, et al., Facile ａｎｄ quick formation of cellulose nanopaper with nanoparticles ａｎｄ its characterization. Carbohydrate Polymers 221, 195 (2019)
[16] TAO Xulei, XU Zijian*, WANG Chunpeng, TAI Renzhong. Improving the reconstructed image quality ｉｎ ptychography with momentum acceleration. Nuclear Techniques 42, 050102 (2019)
[17] Qingyuan Li; Dong Zhou; Lijuan Zhang; De Ning; Zhenhua Chen; Zijian Xu; Rui Gao; et al. Tuning Anionic Redox Activity ａｎｄ Reversibility for a High-Capacity Li-rich Mn-based Oxide Cathode via an Integrated Strategy. Advanced Functional Materials, 2019, 29: 1806706
[18] Xulei Tao, Zijian Xu*, Renzhong Tai, et al., Spatially correlated coherent diffractive imaging method, Applied Optics, 57, 6527 (2018)
[19] Haigang Liu, Zijian Xu*, Chunpeng Wang, et al. Soft X-ray Spectro-Ptychography for Air Pollution Particulates. Microscopy ａｎｄ Microanalysis 24(S2), 44 (2018)