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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Published on: February 27, 2019

Patterned cholesteric liquid crystal polymer film.

Wei-Liang Hsu1, Ji Ma, Graham Myhre

  • 1University of Arizona, College of Optical Sciences, 1630 East University Boulevard, Tucson, Arizona 85721, USA. whsu@optics.arizona.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate patterned circular polarized optical devices using cholesteric liquid crystal polymer. This technique enables fabrication of advanced optical filters for 3D displays and medical imaging.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Polymer Science

Background:

  • Cholesteric liquid crystals (CLCs) exhibit unique optical properties useful for polarization control.
  • Fabricating arbitrarily patterned CLC devices with high precision remains a challenge.

Purpose of the Study:

  • To demonstrate the creation of arbitrarily patterned circular polarized optical devices.
  • To explore methods for large-area patterning of aligned cholesteric liquid crystal films.
  • To characterize the polarization properties of the fabricated devices.

Main Methods:

  • Utilized photoalignment with polarized ultraviolet light to create aligned CLC films.
  • Employed thermal annealing and solvent rinse techniques for large-area patterning.
  • Measured polarization properties using a Mueller matrix imaging polarimeter.

Main Results:

  • Successfully fabricated patterned nonlinearly polarized optical devices with feature sizes as small as 20 μm.
  • Achieved a circular diattenuation (CD) of 0.812±0.015 in the patterned devices.
  • Derived key polarization properties including depolarization index and circular retardance.

Conclusions:

  • Arbitrarily patterned circular polarized optical devices can be effectively fabricated using cholesteric liquid crystal polymer.
  • The developed patterning methods are suitable for large-area applications.
  • These devices hold significant potential for applications in 3D displays, medical imaging, and interferometry.