Coherent Imaging of Quantum Solids Using a Computer-Generated Hologram

使用计算机生成的全息图对量子固体进行相干成像

• 批准号: 428809035
• 负责人: Dr. Kahraman Keskinbora, Ph.D.
• 金额: --
• 依托单位: Department of Physics
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/428809035?language=en
• 关键词: Coherent; Imaging; Quantum; Solids; Using

Powerful imaging methods open new windows to the micro/nano-world, fuelling the miniaturization trend accompanied by an explosion in our technology. To overcome environmental impacts of this unprecedented growth, we need new low-power computing and efficient clean energy technologies contingent upon development of novel materials. Recently, X-ray microscopy emerged as an ideal tool to embrace such materials research opportunities to address modern societal challenges. This project aims to develop a new X-ray holography method to investigate quantum solids at the nanoscale. Our goal is to visualize microscopic textures that underlie the macroscopic quantum behavior of such materials. The technique depends on computer-generated holograms to split the incident X-rays into a reference beam and a sample beam. The reference beam propagates in the vacuum while the sample beam traverses the sample and is imprinted with phase information that encodes the internal electronic and magnetic structure of the specimen. A camera then captures the interference pattern from which a complex-valued image of the sample is recovered with a spatial resolution down to <30 nm. The image carries information about the samples’ properties such as composition, density, and magnetization. The proposed method has several key advantages: (i) the sample and reference beams are not defined by pre-patterned structures, avoiding the time-consuming sample preparation; (ii) The field of view is not physically anchored to a pre-selected region, allowing investigation of extended samples; (iii) The separation of the sample and the illumination allows vastly flexible experimental capabilities such as reflection geometry with new possibilities; (iv) The approach is compatible with single-shot, ultra-fast imaging at the nanoscale. Simulations support the viability of the proposed method we call the Structured Illumination X-ray Holography (SIXH). SIXH will provide new insights in X-ray microscopy, but more importantly, it critically leverages current and future high-coherence sources. Therefore, it is poised to have a broad impact on our understanding of quantum solids and X-ray science in general, with far-reaching applications extending beyond hard condensed matter physics.

强大的成像方法为微纳世界打开了新的窗口，推动了伴随着我们技术爆炸性增长的小型化趋势。为了克服这种前所未有的增长对环境的影响，我们需要新的低功耗计算和高效的清洁能源技术，这取决于新材料的开发。最近，X射线显微镜成为一种理想的工具，可以利用这些材料的研究机会来应对现代社会的挑战。该项目旨在开发一种新的X射线全息方法来研究纳米级的量子固体。我们的目标是可视化这些材料宏观量子行为背后的微观纹理。这项技术依靠计算机生成的全息图将入射X射线分成参照束和样本束。当样品束穿过样品时，参考束在真空中传播，并印有编码样品内部电子和磁性结构的位相信息。然后，相机捕捉干涉图案，从干涉图案中恢复样本的复值图像，空间分辨率降至&lt；30 nm。图像携带了有关样品属性的信息，如成分、密度和磁化强度。提出的方法具有几个关键优点：(I)样品和参考光束不是由预先图案化的结构定义的，避免了耗时的样品制备；(Ii)视野不是物理上固定到预先选择的区域，允许调查扩展的样品；(Iii)样品和照明的分离允许非常灵活的实验能力，例如具有新的可能性的反射几何学；(Iv)该方法与单次拍摄、纳米级的超快成像兼容。模拟结果支持了我们所提出的结构照明X射线全息术(SICH)的可行性。Sixh将在X射线显微镜方面提供新的见解，但更重要的是，它关键地利用了当前和未来的高相干源。因此，它将对我们对量子固体和一般X射线科学的理解产生广泛的影响，其深远的应用超越了硬凝聚态物理。