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Nonlinear nanofocusing in tapered plasmonic waveguides.

Arthur R Davoyan1, Ilya V Shadrivov, Alexander A Zharov

  • 1Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.

Physical Review Letters
|September 28, 2010
PubMed
Summary

Tapered waveguides can compensate for surface plasmon-polariton losses, enhancing nanoscale nonlinear effects. This enables stable spatial plasmon soliton propagation and two-dimensional beam nanofocusing.

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Nonlinear Optics

Background:

  • Surface plasmon-polaritons (SPPs) are electromagnetic waves confined to metal-dielectric interfaces.
  • SPPs suffer from propagation losses, limiting their use in nanoscale devices.
  • Nonlinear optical effects are crucial for light manipulation at the nanoscale.

Purpose of the Study:

  • To investigate the use of tapered waveguides for compensating SPP losses.
  • To enhance nonlinear effects in plasmonic structures.
  • To achieve stable propagation of spatial plasmon solitons and observe beam nanofocusing.

Main Methods:

  • Numerical simulations of nonlinear plasmon self-focusing in tapered metal-dielectric-metal slot waveguides.
  • Analysis of mode attenuation and soliton propagation dynamics.

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  • Parametric study of the influence of taper angle on plasmonic behavior.

    • Main Results:

    • Tapered waveguides effectively suppress mode attenuation, enabling stable SPP propagation.
    • An optimal taper angle allows for the achievement of spatial plasmon solitons.
    • Larger tapering angles lead to plasmon-beam nanofocusing in both transverse dimensions.

    Conclusions:

    • Tapered waveguides offer a viable strategy for overcoming SPP losses.
    • This approach enhances nonlinear plasmonics for nanoscale applications.
    • The demonstrated nanofocusing opens possibilities for advanced optical devices.