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Figure 1
Fresnel zone plate lenses can be deducted from the ideal lens with parabolic phase-shift profile (a), by wrapping the phase profile modulo 2π to minimize the absorption in the lens material (b). Owing to manufacturing difficulties of the continuous blazed profile, multilevel zone plates are the discrete approximations of the phase-wrapped lens (c–e). In this respect the binary Fresnel zone plate represents the most basic two-level approximation (f). The fundamental limit of diffraction efficiency increases with better approximation (right).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 3| May 2014| Pages 497-501
https://doi.org/10.1107/S1600577514003403
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