Development of Hard X-ray Focusing Optics at Diamond Light Source

Alianelli, Lucia; Laundy, D.; Alcock, Simon G.; Sutter, John P.; Sawhney, Kawal

doi:10.1080/08940886.2016.1198667

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…Fox et al (2014) have focused an X-ray beam of 15 keV to a 230 nm spot using a microcrystalline diamond lens, and an X-ray beam of 11 keV to a 210 nm spot using a nanocrystalline diamond lens. Designs of diamond CRLs proposed by Alianelli et al (2016) would potentially be capable of focusing down to 50 nm beam sizes. Many technical problems remain to be solved in the machining of diamond; however, our current aim is to provide an ideal lens design to be used when the technological issues are overcome.…”

Section: Introductionmentioning

confidence: 99%

Aberration-free aspherical lens shape for shortening the focal distance of an already convergent beam

Sutter

Alianelli

2017

J Synchrotron Radiat

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Edited by M. Yabashi, RIKEN SPring-8 Center, JapanKeywords: X-ray; lens; oval; nanofocusing; aberration.Aberration-free aspherical lens shape for shortening the focal distance of an already convergent beam John P. Sutter* and Lucia Alianelli Diamond Light Source Ltd, Chilton, Didcot, Oxfordshire OX11 0DE, UK. *Correspondence e-mail: john.sutter@diamond.ac.ukThe shapes of single lens surfaces capable of focusing divergent and collimated beams without aberration have already been calculated. However, nanofocusing compound refractive lenses (CRLs) require many consecutive lens surfaces. Here a theoretical example of an X-ray nanofocusing CRL with 48 consecutive surfaces is studied. The surfaces on the downstream end of this CRL accept X-rays that are already converging toward a focus, and refract them toward a new focal point that is closer to the surface. This case, so far missing from the literature, is treated here. The ideal surface for aberration-free focusing of a convergent incident beam is found by analytical computation and by ray tracing to be one sheet of a Cartesian oval. An 'X-ray approximation' of the Cartesian oval is worked out for the case of small change in index of refraction across the lens surface. The paraxial approximation of this surface is described. These results will assist the development of large-aperture CRLs for nanofocusing.

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Section: Introductionmentioning

confidence: 99%

Aberration-free aspherical lens shape for shortening the focal distance of an already convergent beam

Sutter

Alianelli

2017

J Synchrotron Radiat

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3D Nanofabrication of High‐Resolution Multilayer Fresnel Zone Plates

et al. 2018

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Focusing X‐rays to single nanometer dimensions is impeded by the lack of high‐quality, high‐resolution optics. Challenges in fabricating high aspect ratio 3D nanostructures limit the quality and the resolution. Multilayer zone plates target this challenge by offering virtually unlimited and freely selectable aspect ratios. Here, a full‐ceramic zone plate is fabricated via atomic layer deposition of multilayers over optical quality glass fibers and subsequent focused ion beam slicing. The quality of the multilayers is confirmed up to an aspect ratio of 500 with zones as thin as 25 nm. Focusing performance of the fabricated zone plate is tested toward the high‐energy limit of a soft X‐ray scanning transmission microscope, achieving a 15 nm half‐pitch cut‐off resolution. Sources of adverse influences are identified, and effective routes for improving the zone plate performance are elaborated, paving a clear path toward using multilayer zone plates in high‐energy X‐ray microscopy. Finally, a new fabrication concept is introduced for making zone plates with precisely tilted zones, targeting even higher resolutions.

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Developments in X-Ray Optics Modelling at Diamond Light Source

Sutter,

Alianelli,

et al. 2023

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Development of Hard X-ray Focusing Optics at Diamond Light Source

Cited by 5 publications

References 18 publications

Aberration-free aspherical lens shape for shortening the focal distance of an already convergent beam

Aberration-free aspherical lens shape for shortening the focal distance of an already convergent beam

3D Nanofabrication of High‐Resolution Multilayer Fresnel Zone Plates

Developments in X-Ray Optics Modelling at Diamond Light Source

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