Imaging by zone plates: axial stigmatism at a particular order

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Abstract
A Fresnel zone plate (FZP) produces simultaneously multiple images, both real and virtual. In general, none of the images is stigmatic beyond the paraxial domain. Axially stigmatic imaging by FZP’s calls for unique values of zone radii corresponding to each combination of the order number of the image and the object distance. In a recent paper [ J. Opt. Soc. Am. A 10, 69 ( 1993)] we presented a set of nomographs for ready estimation of zone-plate parameters. The treatment dealt with the special case of a positive first-order image produced by a FZP. We now extend the study to incorporate imaging of any specific order. It is shown that, with a simple redefinition of the variables, the nomographs presented in the earlier paper retain their practical usefulness.

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