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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 7, Iss. 8 — Aug. 1, 1990
  • pp: 1470–1474

Guided-mode resonances in planar dielectric-layer diffraction gratings

S. S. Wang, R. Magnusson, J. S. Bagby, and M. G. Moharam  »View Author Affiliations

JOSA A, Vol. 7, Issue 8, pp. 1470-1474 (1990)

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The guided-mode resonance behavior of the evanescent and propagating fields associated with an unslanted, planar diffraction grating is studied by means of the rigorous coupled-wave theory. For weakly modulated gratings, the condition on the guided-mode wave number of the corresponding unmodulated dielectric-layer waveguide may be used to predict the range of the incident angle or wavelength within which the resonances can be excited. Furthermore, the locations of the resonances are predicted approximately by the eigenvalue equation of the waveguide. As the modulation amplitude increases, the location and shape of the resonances are described in detail by the rigorous coupled-wave theory. The results presented demonstrate that the resonances can cause rapid variations in the intensity of the external propagating diffracted waves.

© 1990 Optical Society of America

Original Manuscript: November 29, 1989
Manuscript Accepted: April 6, 1990
Published: August 1, 1990

S. S. Wang, M. G. Moharam, R. Magnusson, and J. S. Bagby, "Guided-mode resonances in planar dielectric-layer diffraction gratings," J. Opt. Soc. Am. A 7, 1470-1474 (1990)

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