Kenneth John Harrison
Defence Research Agency
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Proceedings of SPIE | 1992
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
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
Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson; David F. Newton
Archive | 1982
Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson
Archive | 1992
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
Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson
Archive | 1982
Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson
Archive | 1982
Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson
Archive | 1982
Kenneth John Harrison; Edward Peter Raynes; Frances Carolyn Saunders; David John Thompson
Archive | 1982
David John Thompson; Frances Carolyn Saunders; Edward Peter Raynes; Kenneth John Harrison