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Related Experiment Video

Updated: Sep 20, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Phase Matching via Plasmonic Modal Dispersion for Third Harmonic Generation.

Zhe Wang1, Zhe Wang2, Vijith Kalathingal3

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 6, 2022
PubMed
Summary

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Researchers achieved efficient third-harmonic generation (THG) in plasmonic waveguides using modal phase matching. This breakthrough enables compact nonlinear optical devices with significantly reduced interaction lengths and device areas.

Area of Science:

  • Nonlinear Optics
  • Plasmonics
  • Materials Science

Background:

  • Nonlinear optical processes rely on phase-matching for efficiency.
  • Traditional methods use birefringence, requiring long interaction lengths.
  • Modal phase matching in nonbirefringent media offers an alternative but faces limitations.

Purpose of the Study:

  • To demonstrate third-harmonic generation (THG) in plasmonic waveguides using modal phase matching.
  • To achieve efficient nonlinear optical processes in compact devices.
  • To explore the use of organic polymers in plasmonic nonlinear optics.

Main Methods:

  • Utilized plasmonic waveguides with an organic polymer (poly[3-hexylthiophene-2,5-diyl]) as the nonlinear medium.
  • Harnessed modal phase matching to compensate for index mismatch.
Keywords:
modal phase matchingnonlinear polymersplasmonic modesplasmonic waveguidesthird-harmonic generationtwo-wire transmission lines

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Last Updated: Sep 20, 2025

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  • Experimentally investigated THG efficiency and its correlation with laser polarization.

    • Main Results:

    • Achieved an effective interaction area as small as ≈ 0.11 µm².
    • Demonstrated THG efficiency of ≈ 10⁻³ W⁻² within an effective length of ≈ 4.3 µm.
    • Observed strong correlation between THG and incident laser polarization, confirming plasmonic modal phase matching.

    Conclusions:

    • Plasmonic modal phase matching enables highly efficient THG in compact devices.
    • The demonstrated approach significantly reduces device area, ideal for integration.
    • This work opens avenues for on-chip nonlinear optical applications.