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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Nonlinear couplers with tapered plasmonic waveguides.

José R Salgueiro1, Yuri S Kivshar

  • 1Departamento de F´ısica Aplicada, Universidade de Vigo, As Lagoas s/n, 32004 Ourense, Spain. jrs@uvigo.es

Optics Express
|April 27, 2012
PubMed
Summary

We improved optical switching in nanoscale plasmonic devices using tapered waveguides. This method overcomes signal loss while maintaining subwavelength light confinement for sharper switching responses.

Area of Science:

  • Photonics and Nanotechnology
  • Nonlinear Optics
  • Plasmonics

Background:

  • Nonlinear plasmonic couplers are crucial for nanoscale optical switching.
  • These devices often suffer from significant signal loss and limited switching sharpness.
  • Subwavelength confinement is essential for miniaturization but exacerbates loss issues.

Purpose of the Study:

  • To enhance the performance of nonlinear plasmonic couplers for optical switching.
  • To overcome signal loss while preserving subwavelength confinement.
  • To improve the sharpness and efficiency of the switching operation.

Main Methods:

  • Numerical demonstration of a directional coupler geometry.
  • Incorporation of tapered waveguides in metal-dielectric slot waveguides.

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  • Optimization of taper angle for performance enhancement.

    • Main Results:

    • Dramatically enhanced performance for optical switching.
    • Overcoming detrimental losses in nonlinear plasmonic couplers.
    • Preservation of subwavelength confinement.
    • Compensation for amplitude decrease and enhanced response sharpness.

    Conclusions:

    • Tapered waveguides significantly improve nonlinear plasmonic coupler performance.
    • The proposed geometry effectively mitigates losses and enhances switching characteristics.
    • This approach offers a viable path for efficient nanoscale optical switching devices.