High gain beam compression in new-generation thin-film x-ray waveguides

Abstract

X-ray waveguides can compress an incident beam for microscopy applications above 8 keV photon energy to sizes smaller than 100 nm in one dimension, a range which is not routinely accessed with other x-ray optics (e.g., Fresnel zone plates). Beryllium, because of its low absorption, is expected to provide the highest intensity gain. Measured gains for a beryllium waveguide of 74 nm thickness exceed values of 100 at 13 and 20 keV photon energy, which is an improvement by an order of magnitude compared to previously reported performances. The same object works also at 8 keV with gain 43.

X-ray beam compression by tapered waveguides

“…1 These kinds of x-ray optics have first been realized as planar layered systems [one-dimensional waveguide (1DWG)], [2][3][4][5] and later also as two-dimensional confined channels (2DWGs), 6,7 as required for applications in coherent imaging. In contrast to most other nano-focusing optics such as Kirkpatrick-Baez (KB) mirrors, [8][9][10][11] Fresnel zone plates (FZP), 12 or compound diffractive lenses, 13 2DWGs deliver nanoscale x-ray beams with controllable spatial coherence.…”

Recent advances in X'ray refractive optics

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X-ray Diffraction from X-ray Waveguide Arrays for Generation of Coherent X-ray

“…A coherent diffraction-imaging technique has been developed by using monochromatic coherent x-ray beams to investigate the nanostructure of materials [3][4][5]. The flux of x-rays at the exit of the waveguide is efficiently produced by the enhancement of the internal resonant field in the guiding layer [6]. Bongaerts et.…”