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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 11, Iss. 10 — Oct. 1, 1994
  • pp: 2695–2703

Artificial uniaxial and biaxial dielectrics with use of two-dimensional subwavelength binary gratings

Eric B. Grann, M. G. Moharam, and Drew A. Pommet  »View Author Affiliations


JOSA A, Vol. 11, Issue 10, pp. 2695-2703 (1994)
http://dx.doi.org/10.1364/JOSAA.11.002695


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Abstract

Two-dimensional symmetric and asymmetric subwavelength binary gratings are investigated. A method for determining the three effective indices of a two-dimensional (2-D) subwavelength grating is presented, as well as a theoretical formalization for the effective index parallel with the normal to the surface. It is shown that a 2-D asymmetric binary grating on the surface of a dielectric substrate is analogous to a biaxial thin film. If the grating is symmetric, then the two effective indices perpendicular to the normal are equal, and the grating is analogous to a uniaxial thin film. Using these effective indices and the quarter-wave Tschebyscheff synthesis technique, we designed two- and three-level binary gratings to suppress reflections over a broad band. It is shown that for a substrate index of ns = 3.0 a three-level 2-D binary grating reduced reflections below 0.1% from 8 μm to 12 μm.

© 1994 Optical Society of America

History
Original Manuscript: December 23, 1993
Revised Manuscript: May 13, 1994
Manuscript Accepted: May 16, 1994
Published: October 1, 1994

Citation
Eric B. Grann, M. G. Moharam, and Drew A. Pommet, "Artificial uniaxial and biaxial dielectrics with use of two-dimensional subwavelength binary gratings," J. Opt. Soc. Am. A 11, 2695-2703 (1994)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-11-10-2695

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