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Plasmonic nano-comb structures for efficient large-area second harmonic generation.

Hongchul Sim, Hee-Jin Lim, Jung-Hwan Song

    Optics Express
    |August 5, 2014
    PubMed
    Summary
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    We developed plasmonic nano-comb (PNC) structures for enhanced large-area second-harmonic generation (SHG). These PNCs significantly boost SHG efficiency, showing over 200x enhancement with larger laser beams.

    Area of Science:

    • Photonics
    • Materials Science
    • Nonlinear Optics

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion.
    • Existing methods often lack efficiency and scalability for large areas.

    Purpose of the Study:

    • To propose and demonstrate plasmonic nano-comb (PNC) structures for efficient large-area SHG.
    • To investigate the performance of PNCs with varying pump beam sizes.

    Main Methods:

    • Fabrication of PNCs using gold films with P(VDF-TrFE) filled nano-slits.
    • Resonant coupling of PNCs with 1.56 μm femtosecond laser beams.
    • Measurement of SHG power with varying pump beam diameters (2-6 μm).

    Main Results:

    • PNCs with 1.0 μm spacing show resonant coupling with 1.56 μm laser.

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  • SHG power is largely independent of pump diameter (2-6 μm) for PNCs.
  • SHG power is 8x higher than single-nano-gap structures at 2 μm pump diameter.
  • Relative SHG enhancement reaches >200x at 6 μm pump diameter.

    • Conclusions:

    • PNC structures offer efficient large-area SHG.
    • Resonant coupling between pump wave and plasmonic modes enhances SHG.
    • PNCs provide a scalable platform for nonlinear optical applications.