Zone Plate Reconstruction

1. How are zone plates constructed?
2. What is the difference between zone plate and lens?
3. What is a zone plate How does a positive?
4. What is reversal zone plate?

How are zone plates constructed?

A zone plate consists of a set of concentric rings, known as Fresnel zones, which alternate between being opaque and transparent. Light hitting the zone plate will diffract around the opaque zones.

What is the difference between zone plate and lens?

Zone plate has multiple foci

For a fixed distance of the object, a lens produces only one image, where as a zone plate produces a number of images. In other words, it has multiple foci. It is because the number of half-period zones contained in an area depends upon the position of the screen.

What is a zone plate How does a positive?

(2) Positive zone plate : When odd zones are kept transparent to the light and even zones are made opaque, then it is called positive zone plate.

What is reversal zone plate?

Phase-reversal zone plates can be designed even for regions of the electromagnetic spectrum where the index of refraction is complex, with a real part close to 1.0. These devices are superior to Fresnel zone plates both in their light collection, and in their signal-to-noise characteristics.