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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 69, Iss. 7 — Jul. 1, 1979
  • pp: 950–960

Apparent size of reflecting polygonal obstacles of the order of one wavelength

J. G. Dil and B. A. J. Jacobs  »View Author Affiliations


JOSA, Vol. 69, Issue 7, pp. 950-960 (1979)
http://dx.doi.org/10.1364/JOSA.69.000950


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Abstract

Rigorous diffraction theory is applied to compute the electromagnetic fields in the neighborhood of polygonal obstacles of three- and two-dimensional shape, including two-dimensional gratings. For obstacles such as a rectangular depression, a polygonal groove, or an array of grooves present in a metallic substrate, we calculate and measure significant departures from what a scalar diffraction approach would predict as soon as the width of the obstacle becomes smaller than one wavelength. For such widths, it is shown that the apparent depth of a groove can be smaller or larger than the geometrical depth, depending on the polarization of the incident light and on the optical constants of the substrate.

© 1979 Optical Society of America

Citation
J. G. Dil and B. A. J. Jacobs, "Apparent size of reflecting polygonal obstacles of the order of one wavelength," J. Opt. Soc. Am. 69, 950-960 (1979)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-69-7-950


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