dc and ac voltage effects on a mixture of cholesteric liquid crystals are studied. The wavelength of the scattering light shifts to the longer wavelength-side with the application of ac voltage at a frequency higher than 20 Hz, while it shifts to the shorter wavelength-side with the increase in dc voltage. Moreover, it is demonstrated experimentally that the modulation of the light can be observed with ac voltage at a frequency lower than 20 Hz. The modulation frequency of the light changes from f to 2f at 0.1 Hz with decreasing the applied frequency f. The phenomena such as the modulation factor and the phase lag are observed strongly dependent upon the frequency.
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Wako et al. (1972) studied this question.
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