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Templated Sphere Phase Liquid Crystals for Tunable Random Lasing.

Ziping Chen1, Dechun Hu2, Xingwu Chen3

  • 1National Engineering Lab for TFT-LCD Materials and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. positive_ping@sjtu.edu.cn.

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|November 16, 2017
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Summary

Researchers stabilized sphere phase liquid crystals (SPLCs) using polymer templates, enabling tunable random lasing. This advancement broadens SPLC temperature ranges and allows for electric field-controlled wavelength shifting.

Keywords:
lasers and laser opticsliquid crystalmaterialssphere phase

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optics

Background:

  • Sphere phase liquid crystals (SPLCs) exhibit unique 3D twist structures but are limited by a narrow thermal stability range.
  • Disclinations within SPLCs contribute to their complex phase behavior between isotropic and blue phases.

Purpose of the Study:

  • To enhance the thermal stability of sphere phase liquid crystals (SPLCs) using polymer templates.
  • To demonstrate wavelength-tunable random lasing in dye-doped SPLCs.
  • To investigate the effect of polymer concentration on SPLC properties and lasing characteristics.

Main Methods:

  • Incorporation of a low-concentration polymer template into SPLC formulations.
  • Fabrication of dye-doped SPLC samples with varying polymer concentrations.
  • Characterization of SPLC thermal stability and optical properties.
  • Demonstration and analysis of random lasing phenomena and wavelength tunability.

Main Results:

  • Polymer templating significantly improved SPLC thermal stability, broadening the operational temperature range to over 448 K.
  • Wavelength-tunable random lasing was successfully demonstrated in dye-doped, template-processed SPLCs.
  • Continuous wavelength shifting of over 40 nm was achieved through electric field modulation, dependent on polymer concentration.

Conclusions:

  • Polymer templating is an effective strategy to enhance the thermal stability and broaden the operating temperature range of SPLCs.
  • Template-processed SPLCs offer a promising platform for developing tunable random lasers with electric field controllability.
  • The ability to tune lasing wavelength by over 40 nm opens possibilities for advanced optical applications.