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Optically pumped surface-emitting lasing using self-assembled block-copolymer-distributed Bragg reflectors.

Jongseung Yoon1, Wonmok Lee, Edwin L Thomas

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nano Letters
|October 13, 2006
PubMed
Summary
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Researchers fabricated a novel organic laser using a block-copolymer photonic crystal. This thin-film device demonstrates efficient lasing through self-assembled polymeric distributed Bragg reflectors and an organic gain medium.

Area of Science:

  • Materials Science
  • Optics
  • Polymer Science

Background:

  • Organic lasers offer tunable and low-cost alternatives to traditional solid-state lasers.
  • Photonic crystals provide wavelength-selective feedback essential for laser operation.
  • Block copolymers enable precise nanoscale structuring for photonic applications.

Purpose of the Study:

  • To fabricate a thin-film organic laser cavity utilizing a block-copolymer-based one-dimensional photonic crystal.
  • To investigate the use of self-assembled polymeric distributed Bragg reflectors (DBRs) as spectral-band selective feedback elements.
  • To achieve optically pumped surface-emitting lasing in an organic gain medium.

Main Methods:

  • Fabrication of a one-dimensional photonic crystal using self-assembly of a lamellar-forming poly(styrene-b-isoprene) (PS-b-PI) diblock copolymer.

Related Experiment Videos

  • Preparation of polymeric distributed Bragg reflectors (DBRs) with a photonic stop band tuned to the gain medium's fluorescence spectrum.
  • Optical pumping of a poly(methyl methacrylate) (PMMA) gain medium doped with 1,4-di-(2-methylstyryl)benzene (Bis-MSB).

    • Main Results:

    • Successful fabrication of a thin-film organic laser cavity.
    • Demonstration of optically pumped surface-emitting lasing.
    • Effective use of self-assembled polymeric DBRs for spectral-band selective feedback.

    Conclusions:

    • Block-copolymer-based photonic crystals are viable for creating efficient organic laser cavities.
    • Self-assembled polymeric DBRs can serve as effective feedback elements in organic lasers.
    • This approach offers a promising route for developing low-cost, tunable organic laser devices.