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Organic semiconductor distributed feedback laser fabricated by direct laser interference ablation.

Marc Stroisch, Thomas Woggon, Uli Lemmer

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    Researchers used holographic ablation with a picosecond laser to create surface relief gratings in an organic semiconductor. This method achieved laser action comparable to traditional lithography, demonstrating efficient distributed feedback lasers.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Organic Electronics

    Background:

    • Organic semiconductors offer tunable optical properties for laser applications.
    • Surface relief gratings are crucial for fabricating distributed feedback (DFB) lasers.
    • Traditional lithographic techniques can be complex and costly for micro/nanostructuring.

    Purpose of the Study:

    • To investigate holographic ablation as a novel method for patterning organic semiconductors.
    • To fabricate surface relief gratings for second-order distributed feedback lasers.
    • To compare the performance of holographically fabricated DFB lasers with those made by standard lithography.

    Main Methods:

    • Utilized a pulsed, frequency-tripled picosecond Nd:YAG laser for holographic ablation.

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  • Patterned a surface relief grating into an organic semiconductor guest-host system (Alq(3):DCM).
  • Analyzed the resulting grating structure and its effect on laser performance.

    • Main Results:

    • Achieved laser action in the patterned organic semiconductor guest-host system.
    • Demonstrated lasing at 646.6 nm using second-order Bragg reflection.
    • Observed laser thresholds comparable to devices fabricated using standard lithographic techniques.
    • Fabricated a relief grating with a period of 399 nm.

    Conclusions:

    • Holographic ablation is an effective technique for creating surface relief gratings in organic semiconductors.
    • This method enables the fabrication of efficient second-order distributed feedback lasers with competitive performance.
    • The study highlights a promising, potentially simpler, route for organic laser fabrication.