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Polymer Dispersed Cholesteric Liquid Crystals With a Toroidal Director Configuration under an Electric Field.

Anna P Gardymova1, Mikhail N Krakhalev1,2, Victor Ya Zyryanov2

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Polymers
|March 6, 2021
PubMed
Summary

Polymer dispersed liquid crystal (PDLC) films exhibit tunable optical properties. Twisted toroidal cholesteric liquid crystal (LC) droplet structures respond strongly to electric fields, enabling applications in optical filters.

Keywords:
cholesteric dropletdichroic dyeelectric fieldorientational structurepolymer dispersted liquid crystal

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Area of Science:

  • Materials Science
  • Optics
  • Condensed Matter Physics

Background:

  • Polymer dispersed liquid crystal (PDLC) films' electro-optical properties depend on liquid crystal (LC) droplet characteristics.
  • Cholesteric LC droplets with homeotropic boundaries exhibit diverse orientational structures (e.g., twisted toroidal).
  • These structures are sensitive to applied electric fields.

Purpose of the Study:

  • Investigate the structural response of twisted toroidal LC droplets in PDLC films to electric fields.
  • Correlate structural changes with optical texture variations.
  • Explore the use of these films as tunable optical filters.

Main Methods:

  • Experimental characterization of PDLC films with cholesteric LC droplets.
  • Computer simulations of droplet behavior under electric fields.
  • Analysis of optical textures using crossed polarizers.

Main Results:

  • Twisted toroidal droplets show significant structural deformation under electric fields.
  • Droplet response is size-independent when analyzed with dimensionless parameters.
  • Comparison of theoretical and experimental curves aids in determining droplet shape.
  • PDLC films with dichroic dyes function as tunable optical filters without polarizers.

Conclusions:

  • The strong electro-optical response of twisted toroidal LC droplets can be leveraged for tunable optical applications.
  • Dimensionless parameter analysis simplifies the understanding of droplet behavior across different scales.
  • PDLC films offer a versatile platform for developing advanced optical filters.