Figure 2 - Plots of the field reconstructed around the focal point of each of the zone plates.
From the following article
Diffractive imaging of highly focused X-ray fields
H. M. Quiney, A. G. Peele, Z. Cai, D. Paterson and K. A. Nugent
Nature Physics 2, 101 - 104 (2006)
doi:10.1038/nphys218
a, Isometric plot of the intensity at the focal plane of the 2-ID-B zone plate. b, A meridional slice through the reconstruction of the three-dimensional intensity distribution. c, A calculation of the data shown in b using the nominal zone-plate parameters and a central stop. The optical axis of the system runs vertically through b–c and e–f. d–f, As for a–c but for the 2-ID-D zone plate. Note that these data sets are on different spatial scales and so the scale bar shown in a is 60 nm in length and the scale bar shown in d is 180 nm in length.
