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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25454–25460

Oblique incidence and polarization effects in coupled gratings

Ángela Coves, Benito Gimeno, and Miguel V. Andrés  »View Author Affiliations

Optics Express, Vol. 20, Issue 23, pp. 25454-25460 (2012)

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Oblique incidence and polarization orientation of the input beam have dramatic effects on the spectral response of coupled dielectric waveguide gratings. Coupled gratings with small periodic perturbations can be described as a problem of two coupled resonances at strictly normal incidence, but we find that the device involves four coupled resonances when oblique incidence and polarization effects are included in the analysis. Very small deviations from normal incidence change qualitatively the spectral response and four peaks are observed, whereas only two peaks are present at normal incidence. Polarization misalignments produce a decrease of the reflectance of the resonances at normal incidence, but a simultaneous shift of the spectral position of the peaks is observed at oblique incidence.

© 2012 OSA

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(120.2440) Instrumentation, measurement, and metrology : Filters
(310.2790) Thin films : Guided waves

ToC Category:
Diffraction and Gratings

Original Manuscript: August 2, 2012
Revised Manuscript: September 19, 2012
Manuscript Accepted: September 20, 2012
Published: October 25, 2012

Ángela Coves, Benito Gimeno, and Miguel V. Andrés, "Oblique incidence and polarization effects in coupled gratings," Opt. Express 20, 25454-25460 (2012)

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