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      Ultralow threshold laser action from toroidal polymer microcavity

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      Author(s)
      Tulek, A.
      Akbulut, D.
      Bayındır, Mehmet
      Date
      2009
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Publisher
      American Institute of Phycsics
      Volume
      94
      Issue
      20
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We report laser action from a toroidal microcavity coated with π-conjugated polymer. An ultralow threshold value of ∼200 pJ/pulse is achieved by free space excitation in ambient conditions. This is the lowest threshold energy obtained in microtoroid lasers by free space excitation. The effective refractive index of the polymer, extracted from Fourier analysis of emission spectra, is 1.787, which is very close to measured value of 1.790 indicating that laser modes are located around the circumference of the cavity as whispering gallery resonances. © 2009 American Institute of Physics.
      Keywords
      Ambient conditions
      Effective refractive index
      Emission spectrums
      Free space
      Laser action
      Polymer microcavity
      Threshold energy
      Toroidal microcavity
      Ultra-low threshold
      Whispering gallery
      Emission spectroscopy
      Fourier analysis
      Microcavities
      Organic polymers
      Polymers
      Refractive index
      Lasers
      Permalink
      http://hdl.handle.net/11693/22741
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.3141730
      Collections
      • Department of Physics 2397
      • Institute of Materials Science and Nanotechnology (UNAM) 1930
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