Huang Sunchao, Duan Ruihuan, Pramanik Nikhil, Boothroyd Chris, Liu Zheng, Wong Liang Jie
School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 637371, Singapore.
Adv Sci (Weinh). 2022 May;9(16):e2105401. doi: 10.1002/advs.202105401. Epub 2022 Mar 31.
Van der Waals (vdW) materials have attracted much interest for their myriad unique electronic, mechanical, and thermal properties. In particular, they are promising candidates for monochromatic, table-top X-ray sources. This work reveals that the versatility of the table-top vdW X-ray source goes beyond what has been demonstrated so far. By introducing a tilt angle between the vdW structure and the incident electron beam, it is theoretically and experimentally shown that the accessible photon energy range is more than doubled. This allows for greater versatility in real-time tuning of the vdW X-ray source. Furthermore, this work shows that the accessible photon energy range is maximized by simultaneously controlling both the electron energy and the vdW structure tilt. These results will pave the way for highly tunable, compact X-ray sources, with potential applications including hyperspectral X-ray fluoroscopy and X-ray quantum optics.
范德华（vdW）材料因其众多独特的电子、机械和热性能而备受关注。特别是，它们是单色桌面X射线源的有前途的候选材料。这项工作表明，桌面vdW X射线源的多功能性超出了迄今为止所展示的范围。通过在vdW结构和入射电子束之间引入倾斜角，理论和实验表明可获得的光子能量范围增加了一倍多。这使得vdW X射线源的实时调谐具有更大的通用性。此外，这项工作表明，通过同时控制电子能量和vdW结构倾斜，可以使可获得的光子能量范围最大化。这些结果将为高度可调谐的紧凑型X射线源铺平道路，其潜在应用包括高光谱X射线荧光透视和X射线量子光学。
