zone plate

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zone plate

[′zōn ‚plāt]
(optics)
A plate with alternate transparent and opaque rings, designed to block off every other Fresnel half-period zone; light from a point source passing through the plate produces an intense point image much like that produced by a lens.
References in periodicals archive ?
Zhao, "Focusing properties of Fresnel zone plates with spiral phase," Opt.
An amplitude Fresnel zone plate models this domain.
However, all zones of a Fresnel zone plate have equal area.
In particular, Fresnel zone plate stencils with an outer zone spacing of 50 nm, suitable for the diffraction of atoms, have been reported recently (25), representing an improvement on outer zone spacings of 415 nm (4) and 230 nm (29) achieved a decade ago.
Mlynek, Imaging and focusing of atoms by a Fresnel zone plate, Phys.
Fresnel zone plates have been used at frequencies from the microwave range to the X-ray region.
Wiltse, "Millimeter-Wave Characteristics of Phase-Correcting Fresnel Zone Plates," IEEE Transactions on Microwave Theory and Techniques, December 1987, Vol.