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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

Attenuation coefficient of single-mode periodic waveguides.

A Baron1, S Mazoyer, W Smigaj

  • 1Laboratoire Charles Fabry de l'Institut d'Optique, CNRS, Université Paris-Sud, Campus Polytechnique, 91127 Palaiseau cedex, France.

Physical Review Letters
|November 24, 2011
PubMed
Summary

The common exponential decay law for light transmission in waveguides is not universally valid, especially for periodic structures with low group velocity. This finding challenges standard methods for measuring optical waveguide attenuation coefficients.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Waveguide Theory

Background:

  • Light transmission in waveguides typically decays exponentially with length due to imperfections.
  • This exponential decay is used to define the attenuation-rate coefficient (α).
  • Current experimental practices rely on this widely accepted model.

Purpose of the Study:

  • To investigate the validity of the exponential decay law for light transmission in periodic monomode waveguides.
  • To challenge the conventional understanding of light transport and attenuation measurement in waveguides.
  • To explore the influence of group velocity on transmission damping.

Main Methods:

  • Theoretical analysis of light transport in waveguides with minimal imperfections.
  • Numerical simulations of light transmission in two distinct waveguide geometries.
  • Comparison of theoretical predictions with numerical results.

Main Results:

  • The exponential damping law is not generally valid for periodic monomode waveguides.
  • Transmission damping deviates from exponential behavior, particularly when group velocity is low.
  • Numerical results confirm theoretical predictions across different waveguide designs.

Conclusions:

  • The study reveals limitations in the universally accepted exponential decay model for waveguide transmission.
  • A revised understanding of light transport is necessary for periodic waveguides, especially at low group velocities.
  • Experimental measurement of attenuation coefficients may require re-evaluation for certain waveguide types.