A zone plate is a device used to focus light or other things exhibiting wave character. [1] Unlike lenses or curved mirrors, zone plates use diffraction instead of refraction or reflection. Based on analysis by French physicist Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor.

Zone plates are sometimes called Fresnel zone plates (FZP), emphasizing the important contributions of Augustin-Jean Fresnel [1]. Another term is diffractive lenses; zone plates can to some extent be used like lenses, even though their operation principle is completely different.

2023年2月13日 · A zone plate is made up of a number of radially symmetric concentric rings called Fresnel zones that alternate between opaque and transparent states. Zone plates are circular diffraction gratings with increasing line densities in the radial direction.

2023年3月21日 · What is a Zone Plate? A zone plate is an optical element that is used to focus light. It is similar to a lens, but instead of using curved surfaces, it uses a series of transparent and opaque concentric rings.

A zone plate is a circular diffraction grating. In its simplest form, a transmission Fresnel zone plate lens consists of alternate transparent and opaque rings. The radii of the zone plate edges are given by. where n is the zone number (opaque and transparent zones count separately), l is the wavelength, and f is the first-order focal length.

Zone plate fabrication: Learn about fabrication techniques, materials, limitations, and how they impact zone plate performance. Zone plate applications: Learn how zone plates enable and impact science and industry around the world.

The result is a “zone plate.” An example, produced by blacking out the first 4 negative zones is shown in Figure \( 13.37\). These things are quite useful, because they can be easily produced and tailored to any wavelength.

2011年5月3日 · A zone plate is a way of focusing light, like a lens, but using Fresnel diffraction instead of refraction. This is cool from a theoretical point of view, because it demonstrates the wave nature of light .

Zone plate lenses made using a new, e-beam based nanofabrication technique have extended outer zones from 25 nm to 15 nm. Shorter depth of focus (λ/NA2) opens the opportunity for soft x-ray “optical sectioning” of biological material.

Use this simple Calculator to assess the effect of various parameters on probe formation. The diffraction efficiency of the Zone Plate is a function of the operating wavelength, the zone material and thickness, as well as the quality of nanostructuring of the zones.