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Figure 6
Diffraction efficiency [\varepsilon_{1}] versus separation distance [\Delta z] for different thicknesses ti of individual zone plates, and for two different values of outermost zone width: drN = 20 nm (a) and drN = 30 nm (b). For each individual zone thickness ti and separation distance [\Delta z], the number of stacked zone plates nzp was chosen to give maximum efficiency, as shown in Fig. 4(b)[link], and the average value of nzp corresponding to a particular value of ti is indicated. As can be seen, there is a pattern of maxima and minima in the efficiences as a function of separation distance [\Delta z], with the first two maxima denoted by zmax1 and zmax2, and the first two minima denoted by zmin1 and zmin2. These maxima and minima are compared with the Talbot distance [equation (10)[link]] for the outermost zones in Fig. 7[link].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 4| July 2018| Pages 1048-1059
https://doi.org/10.1107/S1600577518007208
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