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Optical limiting properties of nonlinear multimode waveguide arrays.

James J Butler1, Steven R Flom, James S Shirk

  • 1Department of Physics, Pacific University, Forest Grove, OR 97116, USA. jjbutler@pacificu.edu

Optics Express
|January 23, 2009
PubMed
Summary

Multimode capillary waveguide arrays with liquid nonlinear absorbers show a stronger nonlinear optical response than single waveguides or bulk materials. Array design, including element spacing, significantly impacts this enhanced nonlinear behavior.

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Area of Science:

  • Nonlinear optics
  • Waveguide optics
  • Materials science

Background:

  • Nonlinear optical effects are crucial for various photonic applications.
  • Capillary waveguides offer unique environments for studying light-matter interactions.
  • Liquid nonlinear absorbers provide tunable optical properties.

Purpose of the Study:

  • To experimentally investigate the nonlinear optical response of multimode capillary waveguide arrays.
  • To compare the performance of waveguide arrays with single waveguides and bulk materials.
  • To understand how array geometry influences nonlinear transmission.

Main Methods:

  • Experimental transmission measurements of multimode capillary waveguide arrays.
  • Utilized liquid nonlinear absorbers within the waveguides.

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  • Varied the pitch-to-diameter ratio (d/Lambda) of the array elements.

    • Main Results:

    • Observed an enhanced nonlinear response in waveguide arrays compared to single waveguides.
    • Demonstrated a stronger nonlinear effect in arrays than in bulk material of equivalent length.
    • Confirmed that intensity distribution and inter-waveguide coupling affect the nonlinear response.

    Conclusions:

    • Multimode capillary waveguide arrays enhance nonlinear optical effects.
    • Array configuration, specifically d/Lambda ratio, is a critical parameter for optimizing nonlinear performance.
    • Coupling and intensity distribution play key roles in the observed enhancement.