Academic Bibliography

 Search 200 years of publications by Ghent University researchers.
Advanced search
1 file | 5.57 MB
Add to list
  1. Search results
  2. Photoaligned liquid crystal devices w...

Photoaligned liquid crystal devices with switchable hexagonal diffraction patterns

Inge Nys (UGent) , Brecht Berteloot (UGent) and Kristiaan Neyts (UGent)
(2022) MATERIALS. 15(7).
Author
Organization
Project
Abstract
Highly efficient optical diffraction can be realized with the help of micrometer-thin liquid crystal (LC) layers with a periodic modulation of the director orientation. Electrical tunability is easily accessible due to the strong stimuli-responsiveness in the LC phase. By using well-designed photoalignment patterns at the surfaces, we experimentally stabilize two dimensional periodic LC configurations with switchable hexagonal diffraction patterns. The alignment direction follows a one-dimensional periodic rotation at both substrates, but with a 60° or 120° rotation between both grating vectors. The resulting LC configuration is studied with the help of polarizing optical microscopy images and the diffraction properties are measured as a function of the voltage. The intricate bulk director configuration is revealed with the help of finite element Q-tensor simulations. Twist conflicts induced by the surface anchoring are resolved by introducing regions with an out-of-plane tilt in the bulk. This avoids the need for singular disclinations in the structures and gives rise to voltage induced tuning without hysteretic behavior.
Keywords
General Materials Science, nematic liquid crystal, 2D periodic structures, hexagonal diffraction patterns, photoalignment, out-of-plane reorientation, flat optical elements, ALIGNMENT, PHASE

Downloads

  • Download
    materials-15-02453 publishedarticle.pdf
    • full text (Published version)
    • |
    • open access
    • |
    • PDF
    • |
    • 5.57 MB

Citation

Please use this url to cite or link to this publication:

MLA
Nys, Inge, et al. “Photoaligned Liquid Crystal Devices with Switchable Hexagonal Diffraction Patterns.” MATERIALS, vol. 15, no. 7, 2022, doi:10.3390/ma15072453.
APA
Nys, I., Berteloot, B., & Neyts, K. (2022). Photoaligned liquid crystal devices with switchable hexagonal diffraction patterns. MATERIALS, 15(7). https://doi.org/10.3390/ma15072453
Chicago author-date
Nys, Inge, Brecht Berteloot, and Kristiaan Neyts. 2022. “Photoaligned Liquid Crystal Devices with Switchable Hexagonal Diffraction Patterns.” MATERIALS 15 (7). https://doi.org/10.3390/ma15072453.
Chicago author-date (all authors)
Nys, Inge, Brecht Berteloot, and Kristiaan Neyts. 2022. “Photoaligned Liquid Crystal Devices with Switchable Hexagonal Diffraction Patterns.” MATERIALS 15 (7). doi:10.3390/ma15072453.
Vancouver
1.
Nys I, Berteloot B, Neyts K. Photoaligned liquid crystal devices with switchable hexagonal diffraction patterns. MATERIALS. 2022;15(7).
IEEE
[1]
I. Nys, B. Berteloot, and K. Neyts, “Photoaligned liquid crystal devices with switchable hexagonal diffraction patterns,” MATERIALS, vol. 15, no. 7, 2022.
@article{8748393,
  abstract     = {{Highly efficient optical diffraction can be realized with the help of micrometer-thin liquid crystal (LC) layers with a periodic modulation of the director orientation. Electrical tunability is easily accessible due to the strong stimuli-responsiveness in the LC phase. By using well-designed photoalignment patterns at the surfaces, we experimentally stabilize two dimensional periodic LC configurations with switchable hexagonal diffraction patterns. The alignment direction follows a one-dimensional periodic rotation at both substrates, but with a 60° or 120° rotation between both grating vectors. The resulting LC configuration is studied with the help of polarizing optical microscopy images and the diffraction properties are measured as a function of the voltage. The intricate bulk director configuration is revealed with the help of finite element Q-tensor simulations. Twist conflicts induced by the surface anchoring are resolved by introducing regions with an out-of-plane tilt in the bulk. This avoids the need for singular disclinations in the structures and gives rise to voltage induced tuning without hysteretic behavior.}},
  articleno    = {{2453}},
  author       = {{Nys, Inge and Berteloot, Brecht and Neyts, Kristiaan}},
  issn         = {{1996-1944}},
  journal      = {{MATERIALS}},
  keywords     = {{General Materials Science,nematic liquid crystal,2D periodic structures,hexagonal diffraction patterns,photoalignment,out-of-plane reorientation,flat optical elements,ALIGNMENT,PHASE}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{12}},
  title        = {{Photoaligned liquid crystal devices with switchable hexagonal diffraction patterns}},
  url          = {{http://doi.org/10.3390/ma15072453}},
  volume       = {{15}},
  year         = {{2022}},
}
Altmetric
View in Altmetric
Web of Science
Times cited: