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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Group-index engineering in silicon corrugated waveguides.

Antoine Brimont1, Jose Vicente Galán, Jose Maria Escalante

  • 1Nanophotonics Technology Center, Universidad Politécnica de Valencia, Camino de Vera s/n 46022, Valencia, Spain. abrimont@ntc.upv.es

Optics Letters
|August 19, 2010
PubMed
Summary

We achieved high group-index engineering in silicon photonic waveguides. This breakthrough enables efficient light manipulation for advanced optical devices.

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Silicon photonics is crucial for integrated optical circuits.
  • Controlling light propagation, specifically group index, is key for device performance.
  • Periodic structures offer a pathway for manipulating optical properties.

Purpose of the Study:

  • To demonstrate group-index engineering in a novel one-dimensional silicon photonic structure.
  • To achieve a high and constant group index over a broad frequency range.
  • To validate theoretical predictions with experimental results.

Main Methods:

  • Fabrication of a deep-etched, laterally corrugated silicon waveguide with patterned circular holes.
  • Theoretical analysis of light propagation within the periodic structure.
  • Experimental characterization of the optical mode's group index.

Main Results:

  • Demonstrated propagation of the first-order optical mode within the Brillouin zone.
  • Achieved a relatively high group index over a wide frequency range.
  • Experimentally confirmed a nearly constant group index of 13.5 over a 14 nm wavelength range in a 50-microm-long waveguide.

Conclusions:

  • The demonstrated corrugated silicon waveguide effectively engineers group index.
  • The results show potential for creating compact and efficient photonic devices.
  • This approach offers a viable method for enhancing light-matter interactions in silicon photonics.