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Optical properties of cholesteric materials used in surface stabilised cholesteric texture devices.
Roberts, N. W.; Guillou, J.-P. S.; Gleeson, H. F.; Kirar, I.; Watson, S. J.; Arikainen, E. O
Molecular Crystals and Liquid Crystals. 2004;411:1099-1112.
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Abstract
An in depth study has been made of the optical properties of a series of non-thermochromic chiral nematic materials to det. the influence of refractive index dispersion on pitch measurements. The materials used were mixts. of a chiral nematic material, BL131a, and a nematic material BL130 (from Merck Ltd.) in which the pitch is changed by varying the concn. of the nematic component. Detailed measurements were made of the ordinary and extraordinary refractive indexes as a function of wavelength across the visible spectrum. Dispersion effects changed the birefringence by approx. 10% across the visible spectrum. Reflection spectra were obtained and used to deduce the helicoidal pitch. Failure to include dispersion in the calcn. led to a significant error in calcns. of both the bandwidth and pitch of the material. Finally, as SSCT devices are electro-optic in nature, the influence of the conducting surface of the device on the optical properties is examd. [on SciFinder (R)]
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