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All-polymer organic semiconductor laser chips: parallel fabrication and encapsulation.

Christoph Vannahme1, Sönke Klinkhammer, Mads Brøkner Christiansen

  • 1Institute for Microstructure Technology, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany. christoph.vannahme@kit.edu

Optics Express
|December 18, 2010
PubMed
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Encapsulated all-polymer organic semiconductor lasers offer tunable visible light. This fabrication method enhances operational lifetime, paving the way for market-ready, mass-produced laser devices.

Area of Science:

  • Optoelectronics
  • Materials Science
  • Polymer Science

Background:

  • Organic semiconductor lasers are promising for tunable visible light sources.
  • Commercialization requires practical device lifetimes and mass-producible fabrication methods.
  • Encapsulation is crucial for protecting organic lasers from environmental degradation.

Purpose of the Study:

  • To introduce all-polymer chips with encapsulated distributed feedback (DFB) organic semiconductor lasers.
  • To demonstrate a scalable fabrication process for these encapsulated lasers.
  • To evaluate the impact of encapsulation on laser performance and operational lifetime.

Main Methods:

  • Fabrication of DFB organic semiconductor lasers using thermal nanoimprint on wafer scale.

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  • Utilizing poly(methyl methacrylate) (PMMA) and cyclic olefin copolymer (COC) for chip fabrication.
  • Hermetic sealing of lasers by thermally bonding a polymer lid, with the organic thin film protected from direct contact.

    • Main Results:

    • Achieved lasing wavelengths from 622 nm to 685 nm by varying grating periods (378 nm to 428 nm).
    • Demonstrated that encapsulation does not alter the spectral properties compared to unencapsulated devices.
    • Observed significant improvements in operational lifetime: 11-fold for PMMA and 3-fold for COC encapsulated lasers compared to unencapsulated PMMA devices.

    Conclusions:

    • All-polymer encapsulated DFB organic semiconductor lasers can be fabricated using scalable nanoimprint technology.
    • The proposed encapsulation method effectively enhances device lifetime without compromising optical performance.
    • These findings represent a significant step towards the commercialization of organic semiconductor lasers.