Instability of a nematic liquid crystal in a biharmonic electric field
Lev B. I. , Sergienko V. N. , Tomchuk P. M. , Frolova E. K.
New characteristic behavior of a nematic liquid crystal (NLC) under the simultaneous action of electric fields with two different frequencies is reported. The changes in the external parameters gave rise to a series of new phenomena: In the case of close frequencies a great diversity of structures of the spatially periodic distribution of the director, including new structures which "intergrow" and "nicker" with the beat frequency, was recorded. In the case of a large frequency difference the critical field for the appearance of Williams domains depends mono-tonically on the higher frequency and this dependence saturates. A theoretical explanation of the observed effects is given. © 1995 American Institute of Physics.
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![](/ps/1213/article_18340_800_head.png "New characteristic behavior of a nematic liquid crystal (NLC) under the simultaneous action of electric fields with two different frequencies is reported. The changes in the external parameters gave rise to a series of new phenomena: In the case of close frequencies a great diversity of structures of the spatially periodic distribution of the director, including new structures which "intergrow" and "nicker" with the beat frequency, was recorded. In the case of a large frequency difference the critical field for the appearance of Williams domains depends mono-tonically on the higher frequency and this dependence saturates. A theoretical explanation of the observed effects is given. © <i>1995 American Institute of Physics.</i>")