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Article
Structure and Morphology of Polymer-Stabilized Cholesteric Diffraction Gratings
Applied Physics Letters
  • Shin-Woong Kang, Kent State University - Kent Campus
  • Samuel N. Sprunt, Kent State University - Kent Campus
  • Liang-Chy Chien, Kent State University - Kent Campus
Publication Date
6-12-2000
Document Type
Article
DOI
10.1063/1.126692
Disciplines
Abstract
We report a study of polymer network morphology in planar diffraction gratings formed from polymer-stabilized cholesteric liquid crystals. Photopolymerizing a mesogenic monomer yields a regular sawtooth morphology, composed of polymer sheets running at an acute angle between thick, uniformly aligned bundles which reside on the opposing substrates. To explain this morphology and evidence of two grating vectors in the diffraction pattern, we propose a model for the liquid-crystal director where out-of-phase twists at the surfaces gear into an interior twist, which has half the period of the surface twist, via splay distortions running between the substrates. The morphology also changes significantly when a nonmesogenic monomer is substituted or when selectively polarized states of UV radiation are used to cure the polymer.
Comments

Copyright 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 76, 3516 (2000) and may be found at http://dx.doi.org/10.1063/1.126692

Citation Information
Shin-Woong Kang, Samuel N. Sprunt and Liang-Chy Chien. "Structure and Morphology of Polymer-Stabilized Cholesteric Diffraction Gratings" Applied Physics Letters Vol. 76 Iss. 24 (2000) p. 3516 - 3518
Available at: http://works.bepress.com/liang-chy_chien/26/