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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Ring-shaped liquid crystal structures through patterned planar photo-alignment.

Brecht Berteloot1, Inge Nys, Guilhem Poy

  • 1Liquid Crystals & Photonics Group, Department of Electronics and Information Systems, Ghent University, Technologiepark-Zwijnaarde 126, B-9052 Ghent, Belgium. kristiaan.neyts@ugent.be.

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This summary is machine-generated.

Researchers developed patterned photo-alignment to control liquid crystal (LC) structures in devices. This method stabilizes complex LC configurations, enabling new applications in optics and electronics.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Soft Matter Physics

Background:

  • Patterned liquid crystal (LC) configurations are crucial for functional devices like lenses, displays, and soft robots.
  • Photo-alignment on surfaces, combined with external stimuli, offers a method to stabilize diverse LC structures.

Purpose of the Study:

  • To develop a planar LC cell utilizing photo-alignment on the bottom substrate and a rubbed nylon film on the top.
  • To achieve patterned planar photo-alignment by modulating linear polarization with a spatial light modulator (SLM).

Main Methods:

  • Fabrication of a planar LC cell with a photo-alignment layer and a rubbed nylon film.
  • Writing a ring pattern with continuous rotation into the photo-alignment layer using an SLM.
  • Simulating LC director configurations using finite element (FE) Q-tensor simulations and optical transmission via a generalized beam propagation method.

Main Results:

  • Observation of four distinct LC configurations (A, B, C, D) based on the patterned photo-alignment.
  • Structure A: ring-shaped region with vertical LC orientation.
  • Structures B, C, and D: varied twist and disclination loop formations within the inner region of the photo-patterned ring.

Conclusions:

  • The study successfully demonstrates controlled patterning of LC structures using photo-alignment.
  • Simulations confirm the observed LC director configurations and predict optical transmission properties.
  • This technique provides a pathway for designing advanced LC-based functional devices.