MilliporeSigma
  • Home
  • Search Results
  • Topological switching and orbiting dynamics of colloidal spheres dressed with chiral nematic solitons.

Topological switching and orbiting dynamics of colloidal spheres dressed with chiral nematic solitons.

Scientific reports (2014-12-06)
T Porenta, S Copar, P J Ackerman, M B Pandey, M C M Varney, I I Smalyukh, S Žumer
ABSTRACT

Metastable configurations formed by defects, inclusions, elastic deformations and topological solitons in liquid crystals are a promising choice for building photonic crystals and metamaterials with a potential for new optical applications. Local optical modification of the director or introduction of colloidal inclusions into a moderately chiral nematic liquid crystal confined to a homeotropic cell creates localized multistable chiral solitons. Here we induce solitons that "dress" the dispersed spherical particles treated for tangential degenerate boundary conditions, and perform controlled switching of their state using focused optical beams. Two optically switchable distinct metastable states, toron and hopfion, bound to colloidal spheres into structures with different topological charges are investigated. Their structures are examined using Q-tensor based numerical simulations and compared to the profiles reconstructed from the experiments. A topological explanation of observed multistability is constructed.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cholesteryl pelargonate, 97%
Sigma-Aldrich
Melamine, 99%
Supelco
Melamine, Pharmaceutical Secondary Standard; Certified Reference Material
USP
Melamine, United States Pharmacopeia (USP) Reference Standard
Supelco
Melamine, analytical standard