Soft x-ray microscopy with 7 nm resolution
Soft x-ray microscopy with 7 nm resolution
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DOI：
10.1364/optica.399885
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发表时间：
2020-11-20
期刊：
影响因子：
10.4
通讯作者：
David, Christian
中科院分区：
文献类型：
--
作者：
Roesner, Benedikt;Finizio, Simone;David, Christian
具有可调谐能量和偏振的强软X射线束的出现推动了高灵敏度、特定元素和非侵入性显微技术的发展，以研究具有高空间和时间分辨率的凝聚态物质。短波长的软X射线有望在深一位数纳米范围内达到空间分辨率，提供前所未有的在基本长度尺度上访问磁现象的途径。尽管在软X射线显微技术方面做出了相当大的努力，但在直接成像方面，10纳米的二维分辨率还没有被超过。在这里，我们报告了突破这一长期限制的重要一步，将新开发的软X射线菲涅尔波带片透镜与先进的扫描控制精度和仔细的光学设计相结合。利用这种方法，我们获得了7 nm的图像分辨率。通过将这种高精度的显微技术与x射线磁性圆二色效应相结合，我们揭示了相互作用的磁性纳米粒子集合中的维度效应。这种效应是当前纳米磁学研究中的热门话题，并突显了高分辨率软X射线显微镜在磁性研究和其他领域的机会。(C)OSA开放获取出版协议条款下的2020年美国光学学会
The availability of intense soft x-ray beams with tunable energy and polarization has pushed the development of highly sensitive, element-specific, and noninvasive microscopy techniques to investigate condensed matter with high spatial and temporal resolution. The short wavelengths of soft x-rays promise to reach spatial resolutions in the deep single-digit nanometer regime, providing unprecedented access to magnetic phenomena at fundamental length scales. Despite considerable efforts in soft x-ray microscopy techniques, a two-dimensional resolution of 10 nm has not yet been surpassed in direct imaging. Here, we report on a significant step beyond this long-standing limit by combining newly developed soft x-ray Fresnel zone plate lenses with advanced precision in scanning control and careful optical design. With this approach, we achieve an image resolution of 7 nm. By combining this highly precise microscopy technique with the x-ray magnetic circular dichroism effect, we reveal dimensionality effects in an ensemble of interacting magnetic nanoparticles. Such effects are topical in current nanomagnetism research and highlight the opportunities of high-resolution soft x-ray microscopy in magnetism research and beyond. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement