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A study of the optical transfer function for annular binary filters

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Abstract:

The annular binary pupil filters consist of two transparent annuli obstructed by an annular mask. The optical transfer functions for them are analytically derived under paraxial approximation, and three- and two- as well as one-dimensional numerical plots are presented. It is shown that by changing the parameters of transparent regions it is possible to improve the axial resolution whilst the transverse resolution remains unchanged, compared with an annular lens. Results indicate, as is well known, that this kind of filters can be applied to three-dimensional confocal microscopy.

Document Type: Research Article

DOI: http://dx.doi.org/10.1078/0030-4026-00229

Affiliations: Department of Physics and Electro-information Science, Wenzhou Normal College, Wenzhou, 325027, China

Publication date: May 1, 2003

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