Abstract
Abstract Response times for conical-helical perturbation of ternary mixtures of cholesteric compounds were measured. It was found that by adding 5–30% of MBBA (p-methoxybenzylidenebutylaniline) to the mixture, a blue shift and bandwidth broadening in the transmission spectra occur. The response time is reduced by a factor of four and the intensity ratio is increased by a factor of seven, accompanied by a wavelength shift towards the blue. By increasing the percentage of MBBA from 30 to 50% the blue mixture is shifted back to red, while the trend of bandwidth broadening continues. The response time for the first stage is further reduced, but a second response stage with much longer time constants is introduced. Optimum response time and contrast occur at ∼30% MBBA
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