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Quasi-two-dimensional diffusive random laser action.

Stefano Gottardo1, Stefano Cavalieri, Oleg Yaroshchuk

  • 1European Laboratory for Nonlinear Spectroscopy and INFM, 50019 Sesto Fiorentino (Florence), Italy. gottardo@lens.unifi.it

Physical Review Letters
|February 9, 2005
PubMed
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We demonstrate controllable random lasing in disordered liquid crystals. The system switches between 3D and 2D transport, showing electric field-controlled, polarized emission.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Random lasing utilizes multiple scattering for feedback in disordered media.
  • Controlling transport dimensionality and polarization is crucial for advanced optical devices.

Purpose of the Study:

  • To investigate tunable random lasing in dye-doped polymer dispersed liquid crystals.
  • To explore the switching of scattering feedback from 3D to quasi-2D transport.
  • To analyze the electric field control over anisotropic and polarized emission.

Main Methods:

  • Fabrication of dye-doped polymer dispersed liquid crystals.
  • Characterization of light scattering properties and transport regimes.
  • Measurement of emission spectra, polarization, and angular dependence under an external electric field.

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Main Results:

  • Demonstrated random lasing with tunable feedback mechanisms (3D to quasi-2D).
  • Observed anisotropic and extraordinary polarized emission.
  • Showcased electric field-induced control over the lasing characteristics.

Conclusions:

  • Dye-doped polymer dispersed liquid crystals offer a versatile platform for tunable random lasing.
  • The electric field effectively controls light transport and emission properties in these anisotropic materials.
  • This work opens possibilities for novel photonic devices based on controlled scattering and polarization.