Topological Switching and Orbiting Dynamics of Colloidal Spheres Dressed with Chiral Nematic Solitons
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.
- Authors:
-
- Univ. of Ljubljana (Slovenia)
- Univ. of Ljubljana (Slovenia); J. Stefan Inst., Ljubljana (Slovenia); Univ. of Pennsylvania, Philadelphia, PA (United States)
- Univ. of Colorado, Boulder, CO (United States)
- Univ. of Colorado, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Univ. of Ljubljana (Slovenia); J. Stefan Inst., Ljubljana (Slovenia)
- Publication Date:
- Research Org.:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Slovenian Research Agency (ARRS)
- OSTI Identifier:
- 1624753
- Grant/Contract Number:
- SC0010305; ER46921; P1-0099; Z1-6725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Science & Technology - Other Topics; Colloids; Liquid Crystals
Citation Formats
Porenta, T., Čopar, S., Ackerman, P. J., Pandey, M. B., Varney, M. C. M., Smalyukh, I. I., and Žumer, S. Topological Switching and Orbiting Dynamics of Colloidal Spheres Dressed with Chiral Nematic Solitons. United States: N. p., 2014.
Web. doi:10.1038/srep07337.
Porenta, T., Čopar, S., Ackerman, P. J., Pandey, M. B., Varney, M. C. M., Smalyukh, I. I., & Žumer, S. Topological Switching and Orbiting Dynamics of Colloidal Spheres Dressed with Chiral Nematic Solitons. United States. https://doi.org/10.1038/srep07337
Porenta, T., Čopar, S., Ackerman, P. J., Pandey, M. B., Varney, M. C. M., Smalyukh, I. I., and Žumer, S. Fri .
"Topological Switching and Orbiting Dynamics of Colloidal Spheres Dressed with Chiral Nematic Solitons". United States. https://doi.org/10.1038/srep07337. https://www.osti.gov/servlets/purl/1624753.
@article{osti_1624753,
title = {Topological Switching and Orbiting Dynamics of Colloidal Spheres Dressed with Chiral Nematic Solitons},
author = {Porenta, T. and Čopar, S. and Ackerman, P. J. and Pandey, M. B. and Varney, M. C. M. and Smalyukh, I. I. and Žumer, S.},
abstractNote = {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.},
doi = {10.1038/srep07337},
journal = {Scientific Reports},
number = 1,
volume = 4,
place = {United States},
year = {Fri Dec 05 00:00:00 EST 2014},
month = {Fri Dec 05 00:00:00 EST 2014}
}
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Figure 1: POM micrographs of microsphere-soliton hybrids in frustrated cholesteric LCs. (a), (b), POM micrographs obtained for two different levels of the microscope’s focal plane (a), above and (b), below the cell midplane. The structures are (from left to right): (1) A bare colloidal microsphere with two boojums surrounded bymore »
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Figures / Tables found in this record:
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