Letter abstract


Nature Physics 6, 196 - 199 (2010)
Published online: 17 January 2010 | doi:10.1038/nphys1506

Subject Categories: Condensed-matter physics | Electronics, photonics and device physics | Optical physics

High-reflectivity high-resolution X-ray crystal optics with diamonds

Yuri V. Shvyd’ko1, Stanislav Stoupin1, Alessandro Cunsolo1,2, Ayman H. Said1 & Xianrong Huang2

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Owing to the depth to which hard X-rays penetrate into most materials, it is commonly accepted that the only way to realize hard-X-ray mirrors with near 100% reflectance is under conditions of total external reflection at grazing incidence to a surface. At angles away from grazing incidence, substantial reflectance of hard X-rays occurs only as a result of constructive interference of the waves scattered from periodically ordered atomic planes in crystals (Bragg diffraction). Theory predicts that even at normal incidence the reflection of X-rays from diamond under the Bragg condition should approach 100%—substantially higher than from any other crystal. Here we demonstrate that commercially produced synthetic diamond crystals do indeed show an unprecedented reflecting power at normal incidence and millielectronvolt-narrow reflection bandwidths for hard X-rays. Bragg diffraction measurements of reflectivity and the energy bandwidth show remarkable agreement with theory. Such properties are valuable to the development of hard-X-ray optics, and could greatly assist the realization of fully coherent X-ray sources, such as X-ray free-electron laser oscillators1, 2, 3.

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  1. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  2. NSLS-II, Brookhaven National Laboratory, Upton, New York 11973, USA

Correspondence to: Yuri V. Shvyd’ko1 e-mail: shvydko@aps.anl.gov



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