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      Unidirectional laser emission from π-conjugated polymer microcavities with broken symmetry

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      Author
      Tulek, A.
      Vardeny, Z.V.
      Date
      2007
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Volume
      90
      Issue
      16
      Language
      English
      Type
      Article
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      Abstract
      We report unidirectional laser emission from π-conjugated polymer microcavities with broken symmetry geometries such as spiral and microdisk containing a "line defect," in comparison with plain microdisk cavity having isotropic emission. We found that the laser emission directionality contrast ratio is 8-10 and far field lateral divergence angle is 12°-15° for both broken symmetry geometries, with no significant increase in the laser threshold intensity. Fourier transform analysis of the laser emission spectra shows that unlike microdisks with line defect, the variation of light trajectories in the spiral microcavities leads to less defined laser modes. © 2007 American Institute of Physics.
      Keywords
      Broken symmetry
      Laser emission spectra
      Lateral divergence angle
      Line defect
      Conjugated polymers
      Emission spectroscopy
      Fourier transforms
      Laser modes
      Laser radiation
      Threshold current density
      Microcavities
      Permalink
      http://hdl.handle.net/11693/23483
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.2723078
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