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Related Experiment Videos

Gradient-index antireflective subwavelength structures for planar waveguide facets.

J H Schmid1, P Cheben, S Janz

  • 1Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada. jens.schmid@nrc-cnrc.gc.ca

Optics Letters
|July 3, 2007
PubMed
Summary
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Subwavelength gratings on silicon-on-insulator waveguides reduce facet reflectivity using a gradient-index effect. This method achieves low reflectivity for essential optical communication modes.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Facet reflectivity in optical waveguides causes signal loss and limits device performance.
  • Silicon-on-insulator (SOI) technology is crucial for integrated photonics.

Purpose of the Study:

  • To demonstrate subwavelength gratings for reducing facet reflectivity in SOI ridge waveguides.
  • To investigate the gradient-index effect for optical facet termination.

Main Methods:

  • Etching subwavelength gratings into waveguide facets.
  • Experimental characterization at 1.55 micrometer wavelength for TE and TM modes.
  • Comparison with effective medium theory and finite-difference time domain (FDTD) simulations.

Main Results:

Related Experiment Videos

  • Achieved experimental reflectivities of 2.0% (TE) and 2.4% (TM) at 1.55 microm.
  • Results align with theoretical predictions from effective medium theory and FDTD calculations.
  • Simulations indicate potential for <1% reflectivity with increased grating modulation.

    • Conclusions:

    • Subwavelength gratings are an effective method for mitigating facet reflectivity in SOI waveguides.
    • The gradient-index effect provides a viable strategy for optical facet termination.
    • Further optimization of grating parameters can lead to near-zero reflectivity.