Stigmatic imaging by zone plates: a generalized treatment

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Abstract
We present a new and succinct formulation for the zone radii of zone plates in terms of the focal length and the object-to-image throw of the imaging configuration. This treatment enables us to develop a method for dimensionless analysis of zone-plate parameters for stigmatic imaging of axial-object points. A set of graphs depicts the essential design parameters of zone plates over a wide range of the electromagnetic spectrum, from the infrared to x-ray wavelengths. These nomographs are useful in designing zone plates for given applications, particularly in rapid assessment of the feasibility of zone plates for specified requirements in the early stages of design.