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Study of waveguide grating eigenmodes for unpolarized filtering applications.

Anne-Laure Fehrembach1, Anne Sentenac

  • 1Institut Fresnel, Centre National de Recherche Scientifique Unité Mixte de Recherche 6133, Faculté de Saint Jérôme (case 162), 13397 Marseille Cedex, France.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 13, 2003
PubMed
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This study analyzes two-dimensional waveguide gratings using a perturbative model. Achieving high-efficiency filtering of unpolarized light requires simultaneous excitation of two independent modes.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Waveguide gratings are crucial optical components.
  • Understanding eigenmode dispersion is key to device performance.

Purpose of the Study:

  • To investigate the dispersion relation of eigenmodes in 2D waveguide gratings.
  • To analytically predict grating anomalies and optimize filtering.

Main Methods:

  • Utilized a perturbative model to study eigenmode dispersion.
  • Derived analytic expressions for complex wavelength.
  • Analyzed grating reflectivity with respect to wavelength and polarization.

Main Results:

  • Developed a model to predict anomalies in grating reflectivity.
  • Identified the necessity of simultaneous excitation of two independent modes for high-efficiency filtering.

Related Experiment Videos

  • Demonstrated a method to achieve this simultaneous excitation.

    • Conclusions:

    • The perturbative model accurately predicts grating anomalies.
    • Simultaneous mode excitation is essential for efficient unpolarized light filtering in waveguide gratings.