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V M O Batista1,2, N M Silvestre1,2, M M Telo da Gama1,2

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Researchers numerically studied nematic droplets on fibers, finding they can avoid topological defects. An electric field can transform ring defects into figure-eight defects in these responsive device components.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Nanoscience

Background:

  • New fabrication techniques for nematic droplets with complex topology enable responsive devices.
  • Nematic droplets on fibers are fundamental units for stimuli-responsive systems, including gas sensors.

Purpose of the Study:

  • To numerically investigate the properties and equilibrium textures of spherical nematic droplets on fibers.
  • To analyze the impact of electric fields on the texture of a homeotropic nematic droplet on a fiber with planar anchoring.

Main Methods:

  • Numerical simulation of spherical nematic droplets on fibers.
  • Analysis of equilibrium textures under homogeneous and hybrid boundary conditions.
  • Investigation of the effect of static (DC) and alternating (AC) electric fields on droplet texture.

Main Results:

  • Nematic droplets can avoid topological defect nucleation under certain boundary conditions, influencing optical response.
  • A DC electric field induces an orientational transition, transforming a ring defect into a figure-eight defect above a threshold field E(c).
  • AC electric fields (high and low frequency) produce textures similar to static fields, contrasting with recent experimental findings.

Conclusions:

  • Nematic droplets on fibers offer tunable properties for responsive device applications.
  • Electric fields provide a mechanism to control topological defects and optical responses in these systems.
  • The study highlights discrepancies with experimental results for AC field effects, suggesting further investigation is needed.