Chang Y-Y, Chen S-Y, Wu H-H, Weng S-C, Chu C-H, Lee Y-R, Tang M-T, Stetsko Yu, Shew B-Y, Yabashi M, Chang S-L
Department of Physics, National Tsing Hua University, Hsinchu, ROC 300 Taiwan.
Opt Express. 2010 Apr 12;18(8):7886-92. doi: 10.1364/OE.18.007886.
Unusual x-ray focusing effect is reported for parabolic curved multi-plate x-ray crystal cavities of silicon consisting of compound refractive lenses (CRL). The transmitted beam of the (12 4 0) back reflection near 14.4388 keV from these monolithic silicon crystal devices exhibits extraordinary focusing enhancement, such that the focal length is reduced by as much as 18% for 2-beam and 56% for 24-beam diffraction from the curved crystal cavity. This effect is attributed to the presence of the involved Bragg diffractions, in which the wavevector of the transmitted beam is bent further when traversing several curved crystal surfaces.
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