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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 67, Iss. 11 — Nov. 1, 1977
  • pp: 1561–1566

Near-field diffraction on the axes of disks

Intaik Chung, C. L. Andrews, and L. F. Libelo  »View Author Affiliations

JOSA, Vol. 67, Issue 11, pp. 1561-1566 (1977)

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We have measured the near-field diffraction on the axis, shadow side of a perfectly conducting disk with precision an order of magnitude higher than previously available. The normally incident plane-polarized plane wave had a wavelength of 10 cm. The higher precision was obtained by use of a small, photoetched, electric probe antenna of gold on an alumina substrate with a microscopic Schottky diode at the center of the dipole detector. The small probe required a magnetron source of 10 W output at the distance of 10 m in a tapered anechoic chamber. Scans were made with 70 aluminum disks ranging in diameters from 0.04 to 2.50 wavelengths. The scans extended from the disk to a distance of two diameters. The first maximum for a resonant disk, circumference 1.1 wavelengths, and a distance from the disk of 0.65 disk diameters was |E|2/|E0|2 = 1.54.

© 1977 Optical Society of America

Intaik Chung, C. L. Andrews, and L. F. Libelo , "Near-field diffraction on the axes of disks," J. Opt. Soc. Am. 67, 1561-1566 (1977)

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  1. A. Sommerfeld, Optics (Academic, New York, 1964), Vol. 4, pp. 247–265.
  2. J. Meixner and W. Andrejewski, "Strange Theorie der Beugung ebener elektromagnetischer Wellen an der volkommen leitenden Kreisscheibe und an der Kreisformigen Offnung im vollkommen leitenden obenen Schirm," Ann. d. Phys. 7, 157–168 (1960).
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  6. Obtained from Micro Pac Industries-Thin Film Products, 2837 Ladybird Lane, Dallas, Tex. 75220.
  7. No. A2S255 Zero-bias Bean-Lead Schottky Diodes are obtained from AERTECH Industries, 825 Stewart Dr., Sunnyvale, Calif. 94086.
  8. Epo-Tek Single Component Epoxy H31 obtained from Epoxy Technology, Inc., 65 Grove St., Watertown, Mass. 02172.
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  10. Obtained from Polymer Corporation, 2120 Fairmont Ave., Reading, Penn. 19603.
  11. Frank M. Green, "Development of Electric and Magnetic Near-Field Probes," Nat. Bur. Stand. (U.S.) Technical Note 658, 1–47 (1975); Electromagnetics Division, Institute for Basic Standards, Boulder, Colo. 80302.
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  13. Precision Variable Attenuator, Mod. S-382C; Hewlett-Packard, 1820 Embarcadero Rd., Palo Alto, Calif. 94303.

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