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Proceedings Paper

Interference imaging with a spatial spiral phase filter
Author(s): Severin Fürhapter; Alexander Jesacher; Stefan Bernet; Monika Ritsch-Marte
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Paper Abstract

Established phase contrast methods in microscopy use the phase-shifted zeroth order Fourier component of an image-carrying light wave as a reference wave for interferometric superposition with the remaining part of the image wave. Our method consists of a spatial Fourier filtering of the image wave with a spiral phase element which leads to an edge enhancement of both amplitude and phase objects. The spiral phase element is realized by displaying a high resolution phase hologram on a computer-controlled reflective spatial light modulator. The edge enhancement is isotropic which means that all edges are highlighted simultaneously. Controlling the phase of the central area of the hologram leads to an interference image that has a 3-dimensional appearance of the object. In order to allow for white light imaging, the dispersion is compensated by a special double-diffraction setup.

Paper Details

Date Published: 15 October 2005
PDF: 5 pages
Proc. SPIE 5962, Optical Design and Engineering II, 59621F (15 October 2005); doi: 10.1117/12.624384
Show Author Affiliations
Severin Fürhapter, Innsbruck Medical Univ. (Austria)
Alexander Jesacher, Innsbruck Medical Univ. (Austria)
Stefan Bernet, Innsbruck Medical Univ. (Austria)
Monika Ritsch-Marte, Innsbruck Medical Univ. (Austria)


Published in SPIE Proceedings Vol. 5962:
Optical Design and Engineering II
Laurent Mazuray; Rolf Wartmann, Editor(s)

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