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Nematic Order, Plasmonic Switching and Self-Patterning of Colloidal Gold Bipyramids

Journal Article · · Advanced Science
 [1];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [4]
  1. South China Normal University, Guangzhou (China); University of Colorado, Boulder, CO (United States)
  2. University of Colorado, Boulder, CO (United States)
  3. South China Normal University, Guangzhou (China)
  4. University of Colorado, Boulder, CO (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Dispersing inorganic colloidal nanoparticles within nematic liquid crystals provides a versatile platform both for forming new soft matter phases and for predefining physical behavior through mesoscale molecular-colloidal self-organization. However, owing to formation of particle-induced singular defects and complex elasticity-mediated interactions, this approach has been implemented mainly just for colloidal nanorods and nanoplatelets, limiting its potential technological utility. Here, orientationally ordered nematic colloidal dispersions are reported of pentagonal gold bipyramids that exhibit narrow but controlled polarization-dependent surface plasmon resonance spectra and facile electric switching. Bipyramids tend to orient with their C5 rotation symmetry axes along the nematic director, exhibiting spatially homogeneous density within aligned samples. Topological solitons, like heliknotons, allow for spatial reorganization of these nanoparticles according to elastic free energy density within their micrometer-scale structures. With the nanoparticle orientations slaved to the nematic director and being switched by low voltages ≈1 V within a fraction of a second, these plasmonic composite materials are of interest for technological uses like color filters and plasmonic polarizers, as well as may lead to the development of unusual nematic phases, like pentatic liquid crystals.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China; Science and Technology Program of Guangzhou; Guangdong Provincial Key Laboratory of Optical Information Materials and Technology; National Science Foundation (NSF)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
2471207
Journal Information:
Advanced Science, Journal Name: Advanced Science Journal Issue: 22 Vol. 8; ISSN 2198-3844
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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