Zone plate

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Example of an image taken with zone plate optics.

A zone plate is a device used to focus light or other things exhibiting wave character. Unlike lenses or curved mirrors however, zone plates use diffraction instead of refraction or reflection. Based on analysis by Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor. The zone plate's focusing ability is an extension of the Arago spot phenomenon caused by diffraction from an opaque disc.

• See also: Wikipedia

• Related: Arago spot, Fresnel lens, Fresnel imager, Diffraction grating, Photon sieve

Magnetic Soft X-ray microscopy Magnetic Soft X-ray microscopy www.cxro.lbl.gov/BL612/index.php?content=magneticimaging.html - Web

Making a photographic zone plate Making a photographic zone plate web.archive.org/.../Zone_Plate.htm - Web

Examples of zone plate photographs Examples of zone plate photographs www.flickr.com/groups/zoneplates/pool/ - Web

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