Abstract
Pure noise-induced electrohydrodynamic convections (EHCs) in nematic liquid crystals are presented in comparison with ac field-induced ones. There exists a characteristic cutoff frequency f c * of noise dividing EHC patterns qualitatively. Sufficiently colored noise with f c < f c * can induce a variety of well-ordered patterns such as Williams domains, fluctuating Williams domains, and grid patterns. The amplitude of the primary pattern (Williams domains) and its wavelength are investigated with varying intensity V N and/or cutoff frequency f c of noise. The present noise-induced EHCs are discussed on the basis of the conventional (ac-based) Carr–Helfrich mechanism.
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