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Proceedings Paper

Cholesteric liquid crystals doped with gold nanoparticles
Author(s): Rajaa Bitar; Gonzague Agez; Michel Mitov
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Paper Abstract

The reflection color of a cholesteric liquid crystal depends on material parameters such as the molecular chirality or the concentration of chiral dopant, the helical pitch of the twisted structure and the optical indices. We show that the color may be selected simply by varying the annealing time of an open cholesteric oligomer film with hybrid anchoring. The 3D representation of the structure is provided by combining complementary imaging techniques. The color selectivity is due to controlled changes of the orientation of the helix axis with respect to the air-material interface. Potential applications are chiral microreflectors and microlenses. Then, we demonstrate the symbiotic association of gold nanoparticles within such cholesteric textures and their long-range self-organized arrangements. We show that the nanoparticles can be patterned on demand only by playing with the film thickness and the interfacial properties of the CLC film. We investigate how the selective reflection is affected by the in situ organization of gold nanoparticles and what is the plasmon response of nanoparticle chains. Potential applications are envisioned in the field of soft nanotechnology and optical materials.

Paper Details

Date Published: 11 October 2012
PDF: 12 pages
Proc. SPIE 8475, Liquid Crystals XVI, 847503 (11 October 2012); doi: 10.1117/12.928359
Show Author Affiliations
Rajaa Bitar, Ctr. d’Elaboration de Matériaux et d’Etudes Structurales, CNRS, Univ. Toulouse (France)
Gonzague Agez, Ctr. d’Elaboration de Matériaux et d’Etudes Structurales, CNRS, Univ. Toulouse (France)
Michel Mitov, Ctr. d’Elaboration de Matériaux et d’Etudes Structurales, CNRS, Univ. Toulouse (France)


Published in SPIE Proceedings Vol. 8475:
Liquid Crystals XVI
Iam Choon Khoo, Editor(s)

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