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Figure 2
The focusing properties through the binary FZP (a, d), KZP (b, e) and TKZP (c, f) are numerically calculated by our BPM-QDHT approach for an X-ray energy of 8 keV. The lenses have a focal length of 161 mm at 8 keV with diameter of 100 µm and outermost zone width of 500 nm. The thickness t of both the KZP and TKZP is 1.8 µm, and is 1.5 µm for the FZP to obtain the best efficiency. (ac) The 2D intensity (on logarithm scale) of the propagated wavefield created by three different types of zone plate lenses. In the insets, the 1D curves (white lines) are the normalized intensity distribution along the axis. (df) The normalized 3D surface profile of the first-order focus intensity of three different types of zone plate lenses. (g) The normalized intensities of the first-order focal spots and the third-order focal spots of the three lenses. (All the design parameters are given in Table S1 of the supporting information.)

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