Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation

Xihang Shi; Yaniv Kurman; Michael Shentcis; Liang Jie Wong; F. Javier García de Abajo; Ido Kaminer

doi:10.1038/s41377-023-01141-2

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Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation

Original Articles

- Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation
- Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation
- LSA 2023年12卷第7期页码：1370-1380
- Affiliations：
  
  1.Solid State Institute and Faculty of Electrical and Computer Engineering, Technion – Israel Institute of Technology, Haifa 32000, Israel
  2.School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
  3.ICFO–Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels 08860, Spain
  4.ICREA–Institució Catalana de Recerca i Estudis Avançats, Passeig Llu$\acute{\mathrm{i}}$s Companys 23, Barcelona 08010, Spain
- Author bio：
  
  Ido Kaminer (kaminer@technion.ac.il)
- Funds：
- DOI：10.1038/s41377-023-01141-2
  中图分类号：
- 纸质出版日期：2023-07-31，
  
  网络出版日期：2023-06-16，
  
  收稿日期：2022-07-22，
  
  修回日期：2023-03-06，
  
  录用日期：2023-03-30
- Accepted：
Scan QR Code
Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation[J]. LSA, 2023,12(7):1370-1380.

Shi, X. H. et al. Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation. Light: Science & Applications, 12, 1370-1380 (2023).
Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation[J]. LSA, 2023,12(7):1370-1380. DOI： 10.1038/s41377-023-01141-2.

Shi, X. H. et al. Free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation. Light: Science & Applications, 12, 1370-1380 (2023). DOI： 10.1038/s41377-023-01141-2.

摘要

Abstract

The science and technology of X-ray optics have come far

enabling the focusing of X-rays for applications in high-resolution X-ray spectroscopy

imaging

and irradiation. In spite of this

many forms of tailoring waves that had substantial impact on applications in the optical regime have remained out of reach in the X-ray regime. This disparity fundamentally arises from the tendency of refractive indices of all materials to approach unity at high frequencies

making X-ray-optical components such as lenses and mirrors much harder to create and often less efficient. Here

we propose a new concept for X-ray focusing based on inducing a curved wavefront into the X-ray generation process

resulting in the intrinsic focusing of X-ray waves. This concept can be seen as effectively integrating the optics to be part of the emission mechanism

thus bypassing the efficiency limits imposed by X-ray optical components

enabling the creation of nanobeams with nanoscale focal spot sizes and micrometer-scale focal lengths. Specifically

we implement this concept by designing aperiodic vdW heterostructures that shape X-rays when driven by free electrons. The parameters of the focused hotspot

such as lateral size and focal depth

are tunable as a function of an interlayer spacing chirp and electron energy. Looking forward

ongoing advances in the creation of many-layer vdW heterostructures open unprecedented horizons of focusing and arbitrary shaping of X-ray nanobeams.

关键词

Keywords

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