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1 January 1998 Pattern formation in homeotropic nematic induced by mechanical rectilinear and elliptical oscillatory excitation
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Abstract
A homeotropic nematic liquid crystal was exposed to low frequency oscillatory shear. In the presence of rectilinear shear a stationary roll pattern was found above a critical amplitude. In case of elliptical excitation a spatially nonuniform slow rotation of the director was observed, which lead to the propagation of the so-called phase waves in two different systems: in a two-phase system and in a homeotropic nematic layer in the presence of a destabilizing external electric filed. Phase waves also have been observed in the ultrasonic frequency range at much smaller shear amplitudes.
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T. Boerzsoenyi, A. P. Krekhov, O. A. Scaldin, and A. Buka "Pattern formation in homeotropic nematic induced by mechanical rectilinear and elliptical oscillatory excitation", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301268
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