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Related Experiment Videos

Photonic gaps in cholesteric elastomers under deformation.

P Cicuta1, A R Tajbakhsh, E M Terentjev

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 25, 2004
PubMed
Summary

Cholesteric liquid crystal elastomers exhibit tunable photonic properties. Mechanical deformation alters their structure, affecting light transmittance and photonic stop gaps, with results aligning with theoretical predictions.

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Area of Science:

  • Materials Science
  • Optics
  • Polymer Science

Background:

  • Cholesteric liquid crystal elastomers possess unique photonic properties, including selective Bragg reflection of circularly polarized light.
  • Their periodic structure leads to narrow-band reflection, but quenched disorder can broaden this reflection.
  • Understanding their response to external stimuli is crucial for applications.

Purpose of the Study:

  • To experimentally investigate the effect of mechanical deformation on light transmittance in cholesteric liquid crystal elastomers.
  • To correlate changes in transmittance with alterations in the liquid crystalline structure.
  • To compare experimental findings with theoretical predictions for photonic stop gap evolution.

Main Methods:

  • Synthesis of cholesteric liquid crystal elastomer samples with photonic stop gaps across the visible spectrum.

Related Experiment Videos

  • Experimental measurement of light transmittance as a function of mechanical deformation.
  • Analysis of structural changes in the liquid crystalline phase induced by deformation.

    • Main Results:

    • Mechanical deformation significantly impacts the light transmittance of cholesteric liquid crystal elastomers.
    • Changes in transmittance are directly related to modifications in the material's liquid crystalline structure.
    • The experimental evolution of photonic stop gaps under deformation shows good agreement with theoretical models.

    Conclusions:

    • Mechanical deformation is a viable method to tune the photonic properties of cholesteric liquid crystal elastomers.
    • The study validates theoretical predictions regarding the behavior of photonic stop gaps in these materials.
    • These findings pave the way for developing tunable photonic devices based on liquid crystal elastomers.