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Proceedings Paper

Molecular alignment in nanofilm crystal polarizers and retarders
Author(s): Leonid Ignatov; Pavel I. Lazarev; Victor Nazarov; Natalya Ovchinnikova; Michael Paukshto
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Paper Abstract

We introduce a new group of organic materials and method for the three-step nano-film crystallization of these materials on the surface of glass or plastic. Materials are based on polycyclic aromatic compounds. Chemical modification of compounds changes hydrophobic-hydrophilic balance of disk-shaped molecules and makes them water-soluble with aggregation into rod-like supramolecules in aqueous solution and subsequent formation of supramolecular lyomesophases. Coating techniques provide control of crystallographic axes direction of the final crystal film. Shear force that is applied during deposition controls alignment of supramolecules. Structure of liquid material, wet coating and resulting 100-700 nm thin crystal films has been studied optically and by X-ray diffraction. The properties of the molecular material dictate the properties of Thin Crystal Film (TCF), which exhibit the layered molecular structure with interlayer distance equal to thickness of flat molecules (0.336 nm). Molecular alignment during the shear deposition of Lyotropic Liquid Crystal (LLC) results in formation of film with a strong preferred orientation. TCF order parameter determined from both X-ray analysis and optical data is about 0.9. TCFs exhibit a high optical anisotropy and birefringence which makes them unique nano-scale polarizing films and high efficiency retarders. New submicron film retarders have high refraction coefficient anisotropy. Birefringence varies from 0.3 to 1.0 for 380-900nm wavelength range. TCF polarizers and retarders provide new options for LCD designs.

Paper Details

Date Published: 15 November 2002
PDF: 12 pages
Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); doi: 10.1117/12.451032
Show Author Affiliations
Leonid Ignatov, Optiva, Inc. (United States)
Pavel I. Lazarev, Optiva, Inc. (United States)
Victor Nazarov, Optiva, Inc. (United States)
Natalya Ovchinnikova, Optiva, Inc. (United States)
Michael Paukshto, Optiva, Inc. (United States)

Published in SPIE Proceedings Vol. 4807:
Physical Chemistry of Interfaces and Nanomaterials
Jin Z. Zhang; Zhong L. Wang, Editor(s)

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