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Efficient second-harmonic generation in nonlinear plasmonic waveguide.

F F Lu1, T Li, X P Hu

  • 1National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, College of Physics, Nanjing University, Nanjing, China.

Optics Letters
|September 3, 2011
PubMed
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This study demonstrates efficient second-harmonic generation (SHG) in a hybrid plasmonic waveguide. The waveguide design achieves deep subwavelength optical confinement and low propagation loss for enhanced nonlinear optical processes.

Area of Science:

  • Nonlinear Optics
  • Plasmonics
  • Waveguide Optics

Background:

  • Hybrid plasmonic waveguides combine dielectric and metallic components.
  • These structures exhibit unique optical properties due to mode hybridization.
  • Subwavelength confinement and low loss are crucial for efficient nonlinear optics.

Purpose of the Study:

  • To theoretically investigate second-harmonic generation (SHG) in a hybrid plasmonic waveguide.
  • To analyze the influence of structural parameters on SHG efficiency.
  • To explore the potential of this waveguide for efficient nonlinear optical applications.

Main Methods:

  • Theoretical study of a hybrid plasmonic waveguide structure.
  • Analysis of the hybridization between guided modes and surface plasmon polaritons.

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  • Numerical investigation of second-harmonic generation at a fundamental wavelength of 1.55 μm.

    • Main Results:

    • Efficient second-harmonic generation (SHG) was observed.
    • Deep subwavelength optical field confinement was achieved.
    • The SHG efficiency was analyzed in relation to structural parameters, coupling coefficient, and mode area.

    Conclusions:

    • The hybrid plasmonic waveguide design enables efficient nonlinear optical processes.
    • The demonstrated SHG performance is attributed to effective mode hybridization and field confinement.
    • Structural parameter optimization can further enhance SHG efficiency in such waveguides.