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Related Experiment Videos

Fast analysis method for polarization-dependent performance of a concave diffraction grating with

Jun Song1, Jian-Jun He, Sailing He

  • 1Centre for Optical and Electromagnetic Research, Joint Research Center of Photonics of the Royal Institute of Technology, Sweden.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|October 11, 2005
PubMed
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A new simulation method accurately models waveguide gratings, revealing the Goos-Hänchen shift significantly impacts device performance and loss. This fast, insightful approach aids in optimizing optical device design.

Area of Science:

  • Optics and Photonics
  • Computational Electromagnetics

Background:

  • Waveguide-based diffraction gratings are crucial optical components.
  • Accurate simulation is essential for designing efficient devices like demultiplexers.
  • Existing methods may not fully account for all physical phenomena, such as the Goos-Hänchen shift.

Purpose of the Study:

  • To develop a fast and insightful simulation method for waveguide-based concave gratings with total-internal-reflection (TIR) facets.
  • To incorporate the Goos-Hänchen (GH) shift into the simulation, which is often neglected in conventional methods.
  • To validate the simulation's accuracy against rigorous coupled-wave analysis (RCWA).

Main Methods:

  • Utilized the Kirchhoff-Huygens principle for simulation.
  • Modified the conventional scalar method to include the effects of the Goos-Hänchen (GH) shift.

Related Experiment Videos

  • Compared simulation results with rigorous coupled-wave analysis (RCWA) for validation.

    • Main Results:

    • The developed simulation method shows good agreement with RCWA across various device parameters.
    • The Goos-Hänchen (GH) shift was identified as a primary cause of optical loss.
    • The GH shift was also found to be a key factor in polarization-dependent loss in etched diffraction grating demultiplexers with TIR facets.

    Conclusions:

    • The proposed fast simulation method provides accurate predictions for waveguide gratings with TIR facets.
    • The Goos-Hänchen shift is a critical physical effect that must be considered for accurate modeling of such devices.
    • This method offers valuable physical insights and aids in the design of improved optical demultiplexers.