Thin element approximation for the analysis of blazed gratings: Simplified model and validity limits

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Abstract

The thin element approximation is widely used to predict the diffraction efficiency of thin periodic diffractive optical elements (DOEs). However, as the period-to-wavelength ratio is reduced, the approximation becomes inaccurate. A model based on a "shadow concept" can be used to predict the diffraction efficiency with high accuracy. Hereby we extend the model to include the effect of multi-level staircase structures and non-perpendicular incident angles. We also present an error map and define regions of validity for the thin element approximation (TEA) and the shadow model.

Original languageEnglish
Pages (from-to)11-21
Number of pages11
JournalOptics Communications
Volume229
Issue number1-6
DOIs
StatePublished - 2 Jan 2004

Keywords

  • Blazed gratings
  • Diffraction

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