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Phase-matched second harmonic generation in poled dye/polymer waveguide.

O Sugihara, T Kinoshita, M Okabe

    Applied Optics
    |August 14, 2010
    PubMed
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    Researchers aligned 2-methyl-4-nitroaniline (MNA) molecules in a polymer film, enhancing optical properties. This alignment enabled efficient phase-matched second harmonic generation (SHG) in an optical waveguide.

    Area of Science:

    • Nonlinear optics
    • Materials science
    • Polymer science

    Background:

    • Nonlinear optical materials are crucial for frequency conversion technologies.
    • Achieving efficient second harmonic generation (SHG) requires specific material properties and alignment.
    • Polymeric materials offer versatile platforms for fabricating nonlinear optical devices.

    Purpose of the Study:

    • To prepare and characterize a poled film of 2-methyl-4-nitroaniline (MNA) and poly(methyl methacrylate) (PMMA).
    • To investigate the effects of poling on MNA molecular alignment and optical properties.
    • To demonstrate phase-matched second harmonic generation (SHG) in an optical waveguide incorporating the poled film.

    Main Methods:

    • Fabrication of a poled film by combining 2-methyl-4-nitroaniline (MNA) with poly(methyl methacrylate) (PMMA).

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  • Characterization of MNA molecular alignment through analysis of absorption spectra and refractive index changes.
  • Utilizing the mode dispersion relation of an optical waveguide to achieve phase-matched SHG.

    • Main Results:

    • Successful poling of the MNA/PMMA film led to observed molecular alignments.
    • Poling resulted in a reduction of the absorption spectrum and an increase in the refractive index.
    • Phase-matched second harmonic generation (SHG) was successfully achieved, with an estimated conversion efficiency of 7.4 x 10(-3) %.

    Conclusions:

    • Poled MNA/PMMA films exhibit significant molecular alignment, altering their optical characteristics.
    • The demonstrated phase-matched SHG indicates the potential of these films for nonlinear optical applications.
    • The study highlights the effectiveness of poling techniques for enhancing nonlinear optical properties in polymer-based materials.