14 October 2005 Interference imaging with a spatial spiral phase filter
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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.
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Severin Fürhapter, Severin Fürhapter, Alexander Jesacher, Alexander Jesacher, Stefan Bernet, Stefan Bernet, Monika Ritsch-Marte, Monika Ritsch-Marte, } "Interference imaging with a spatial spiral phase filter", Proc. SPIE 5962, Optical Design and Engineering II, 59621F (14 October 2005); doi: 10.1117/12.624384; https://doi.org/10.1117/12.624384
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