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Selective optical-optical switching for planar plasmonic waveguides and nodes.

Michael C Quong1, Abdulhakem Y Elezzabi

  • 1Ultrafast Optics and Nanophotonics Laboratory, Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada. mquong@ualberta.ca

Optics Express
|June 12, 2008
PubMed
Summary

This study introduces two novel nodes for selective optical switching in surface plasmon waveguides. These designs enable efficient light control with significant signal attenuation for turned-off channels.

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Area of Science:

  • Photonics and Optics
  • Nanophotonics
  • Plasmonics

Background:

  • Surface plasmon polaritons (SPPs) offer a promising platform for miniaturized optical circuits.
  • Efficient and selective coupling of light into and out of SPP waveguides is crucial for integrated photonic devices.
  • Existing methods for optical switching often face challenges in terms of size, efficiency, and cross-talk.

Purpose of the Study:

  • To investigate two distinct node designs for achieving selective optical-optical switching of four planar thin surface plasmon waveguides.
  • To analyze the performance of these nodes in terms of switching contrast, coupling efficiency, and cross-talk.
  • To demonstrate the feasibility of achieving high signal attenuation for unselected waveguides.

Main Methods:

  • Utilizing interfering transverse electromagnetic (TEM(10), TEM(01), and TEM(00)) light beams incident upon specifically designed nodes.

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  • Employing a flat-apex pyramidal reflector as one node design to direct incident light.
  • Using a simple square aperture as an alternative node, leveraging light diffraction for surface plasmon coupling.
  • Performing numerical calculations to predict key performance metrics.

    • Main Results:

    • Both node designs demonstrate the capability for selective optical switching of surface plasmon waveguides.
    • Numerical simulations predict achievable switching contrasts and coupling efficiencies.
    • Significant attenuation of coupled surface plasmons (at least -10 dB, up to -21 dB) is predicted for individually turned-off waveguides.
    • Cross-talk between waveguides is quantified through numerical analysis.

    Conclusions:

    • The proposed node designs offer a viable approach for selective optical switching in plasmonic circuits.
    • The flat-apex pyramidal reflector and square aperture nodes provide efficient coupling and high extinction ratios.
    • These findings contribute to the development of advanced integrated photonic devices and optical communication systems.