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      Laser action studies of π-conjugated polymer microcavities

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      Author(s)
      Tülek, Abdullah
      Vardeny, Z. V.
      Date
      2008
      Source Title
      Proceedings of the 10th Anniversary International Conference on Transparent Optical Networks, ICTON 2008
      Publisher
      IEEE
      Pages
      69 - 72
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
      118
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      Abstract
      Unidirectional laser emission was observed from φ-conjugated polymer microcavities with spiral geometry, and from microdisks containing line defects. For both type of cavities directionality contrast of the laser emission was found to be ̃ 10, with far-field lateral divergence angle of ̃ 15°. No significant increase in the laser threshold intensity was observed compared with simple microdisk cavities. In addition we also studied the emission spectra of microring polymer lasers fabricated on nylon microfibers upon application of uniaxial stress with strain up to ̃ 12%. Substantial change in the laser emission spectrum was observed when stress was applied; showing enhanced optical sensitivity to stress larger than the changes induced in the emission spectrum caused by the microfiber diameter change. We explain the enhanced sensitivity to stress as due to the induced change in the polymer refractive index dispersion, in particular at the laser emission wavelength (̃ 635 nm).
      Keywords
      π-Conjugated polymers
      Optical design
      Optical materials
      Optical properties
      Organic polymers
      Photoresists
      Polymers
      Refractive index
      Videodisks
      Directional emission
      Divergence angles
      Emission spectrums
      Enhanced sensitivity
      Far fields
      Laser action
      Laser actions
      Laser emission spectrum
      Laser emissions
      Laser thresholds
      Line defects
      Micro rings
      Micro-disks
      Micro-fibers
      Microcavity
      Microdisk cavities
      Optical sensitivity
      Polymer lasers
      Refractive index dispersion
      Spiral geometries
      Transparent optical networks
      Uniaxial stress
      Whispering gallery modes
      Permalink
      http://hdl.handle.net/11693/26860
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ICTON.2008.4598736
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      • Department of Physics 2397
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