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Proceedings of SPIE | 1992

Measurement of x(3) in novel liquid-crystal materials

Kenneth J. McEwan; Se Day; Damien Gerard Mcdonnell; Kenneth John Harrison

In this paper we describe measurements of the third order nonlinear susceptibility and the response time for a large number of novel liquid crystal materials, in their isotropic phase, at temperatures close to the isotropic to nematic phase transition. By examining the dependence of the length of the alkyl chain part of the molecule, for the cyanobiphenyl and alkoxy- cyanobiphenyl homologous series, it is shown that the small alkyl chain materials have a superior nonlinear response. Unfortunately in these materials the large nonlinear effects close to the nematic phase are inaccessible because the solid phase is formed directly on cooling the isotropic liquid. An alternative route to large effects is to increase the molecular anisotropy in polarizability, while maintaining approximately the same molecular dimensions. It is shown that a significant increase in the size of the nonlinear response can be achieved by changing the various chemical constituents.


Archive | 1992

Naphthyl organic compounds

Kenneth J. Toyne; John William Goodby; Alexander J. Seed; George William Gray; Damien Gerad McDonnel; Edward Peter Raynes; Se Day; Kenneth John Harrison; Michael Hird


Archive | 1983

Liquid crystal materials containing pleochroic anthraquinone dyes

Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson; David F. Newton


Archive | 1982

Liquid crystal compositions with pleochroic anthraquines dyes

Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson


Archive | 1992

Anisotropic organic compounds

Kenneth J. Toyne; John W. Goodby; Alexander J. Seed; G. W. Gray; Damien Gerard Mcdonnel; Edward Peter Raynes; Se Day; Kenneth John Harrison; Michael Hird


Archive | 1984

ORGANISCHE ZUSAMMENSETZUNGEN, DIE FUER EINE GUEST- HOST-FLUESSIGKRISTALLANZEIGEVORRICHTUNG GEEIGNET SIND.

Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson


Archive | 1982

Pleochroitische Farbstoffe enthaltende flüssigkristalline Materialien

Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson


Archive | 1982

Liquid crystal materials including pleochroic dyes

Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson


Archive | 1982

Liquid crystal materials comprising pleochroic dyes Liquid crystal materials Comprising pleochroic dyes

Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson


Archive | 1982

Colorants anthraquinoniques pléochroiques

David John Thompson; Frances Carolyn Saunders; Edward Peter Raynes; Kenneth John Harrison

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Se Day

University College London

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