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  • Title: Optical processing with vortex-producing lenses.
    Author: Crabtree K, Davis JA, Moreno I.
    Journal: Appl Opt; 2004 Feb 20; 43(6):1360-7. PubMed ID: 15008542.
    Abstract:
    We discuss two types of optical processing using vortex-producing angular phase plates. In the most common spatial-filtering operation, an input object is Fourier transformed (either by Fraunhofer diffraction or with a lens system). The Fourier transform is then multiplied by an angular phase pattern, and the product is again Fourier transformed. The output is a space-invariant, edge-enhanced version of the input object. Alternatively we can directly image the object using a lens multiplied by the angular phase. The space-variant image is severely distorted along the optical axis of the system. We encode the phase plates onto a liquid-crystal display and present experimental results on both systems.
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