Phase correcting zone plate

Details Phase correcting zone plate Phase correcting zone plate

1993-03-30

1996-01-23

Shafer, Ricky D.

Optical: systems and elements

Diffraction

From zone plate

359569, 359572, 359575, 359742, 343753, 343909, 343910, 343911R, G02B 2744

Patent

active

054869501

ABSTRACT:
A zone plate focusing radiation comprises a plurality of surface portions (20a, 20b, 20c, 20d, 30) corresponding to zones of the zone plate. The surface portions are positioned in a plurality P of parallel planes such that each surface portion diffracts radiation out of phase with respect to adjacent surface portions such that radiation diffracted by the surface portion constructively interferes at a focus of the zone plate. The p.sup.th plane is dielectrically spaced from the first plane by n.lambda., where .lambda. is the wavelength of the radiation and n is an integer.

REFERENCES:
patent: 3189907 (1965-06-01), Van Buskirk
patent: 5073007 (1991-12-01), Kedmi et al.
patent: 5151823 (1992-09-01), Chen
patent: 5161059 (1992-11-01), Swanson et al.
patent: 5278028 (1994-01-01), Hadimioglu et al.
Tudorovskii, "An Objective with Phase Plate", Optics and Spectroscopy, Feb. 1959, pp. 126-133.

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