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Applied Optics

Applied Optics


  • Vol. 27, Iss. 8 — Apr. 15, 1988
  • pp: 1581–1587

Diffraction patterns in the shadows of disks and obstacles

R. Edward English, Jr. and Nicholas George  »View Author Affiliations

Applied Optics, Vol. 27, Issue 8, pp. 1581-1587 (1988)

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We compare the Fresnel diffraction pattern of a thin circular disk with that of a square obstacle, specifically evaluating the on-axis field strength. Photographs of the diffraction patterns reveal some curious features for the square obstacle. Second, the precise electric and magnetic fields behind a conducting circular disk are evaluated without invoking the Fresnel approximation and contrasted with the rigorous electromagnetic result for a metal sphere. The calculations show that the two cases differ only slightly in the Fresnel region. In the near-field new computational results for the sphere are analyzed.

© 1988 Optical Society of America

Original Manuscript: September 16, 1987
Published: April 15, 1988

R. Edward English and Nicholas George, "Diffraction patterns in the shadows of disks and obstacles," Appl. Opt. 27, 1581-1587 (1988)

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