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Updated: Apr 17, 2026

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
Published on: February 8, 2014
The diffracted field and its gradient near the edge of a thin screen
David P Hewett1, U Peter Svensson2
1Department of Mathematics and Statistics, University of Reading, Whiteknights, P.O. Box 220, Reading, RG6 6AX, United Kingdom.
Abstract:
The secondary edge source line integral formulation for diffraction modeling uses edge sources with a 1/r dependency, in addition to a directivity function. At first sight, this might seem to contradict the expected 1/r behavior for the gradient near the edge of a thin screen. An analysis is presented for the special case of perpendicular plane wave incidence onto a thin screen, which shows that the secondary edge source formulation does indeed lead to the expected behavior close to the edge of an ideal wedge.
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