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Figure 9
Stacking of two zone plates with 100 nm outermost zone period, each with ti = 1 µm thickness, at 10 keV photon energy. Using the four different stacking schemes shown in Fig. 8[link], in (a) we show both the radial intensity profile and also the radially integrated energy for m = 2 second diffraction order focusing. The 1:3 line:space approach with the second zone plate being a complementary zone plate has a unique property of having very little energy in sidelobes around the central focus spot. In (b) we show the normalized focus intensity for 1:3 line:space stacking with regular and complementary second zone plate as a function of separation distance [\Delta z], demonstrating a crossover between which approach is preferred at half of [\Delta z_{\rm{c}}] of equation (13)[link]. In (c) we show the focal spot intensity as the line:space ratio is adjusted in both the upstream and (regular) downstream zone plate; the optimum line:space ratio for a variety of separation distances [\Delta z] is shown in (d).

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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