THERMAL FLUCTUATION EFFECTS IN FERROELECTRIC LIQUID-CRYSTAL POLARIZATION REVERSAL - LIGHT-SCATTERING FROM A TRANSIENT DOMAIN-WALL FOAM
THERMAL FLUCTUATION EFFECTS IN FERROELECTRIC LIQUID-CRYSTAL POLARIZATION REVERSAL - LIGHT-SCATTERING FROM A TRANSIENT DOMAIN-WALL FOAM
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DOI：
10.1103/physreva.44.2543
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发表时间：
1991-08-15
影响因子：
2.9
通讯作者：
CLARK, NA
中科院分区：
文献类型：
--
作者：
MACLENNAN, JE;CLARK, NA
在铁电液晶中电场诱导极化反转过程中指向矢场的热取向波动导致了强烈散射光的瞬态畴壁泡沫的不确定性形成。该泡沫包括分子的域，这些分子在近晶-C倾斜锥上以相同的意义局部重新取向，并且通过2-pi反转壁彼此分离。的形成和随后的退火的泡沫的动力学已探测使用激光散射。泡沫的各向异性变粗，这是占包括静电（空间电荷）相互作用的理论描述的铁电液晶，结果在一个惊人的图案的细长条纹。频闪显微镜显示，这些条纹一般从近晶层平面旋转的手性意义上，旋转的意义取决于dE/dt的符号。
Thermal orientation fluctuations of the director field during electric-field-induced polarization reversal in ferroelectric liquid crystals lead to the nondeterministic formation of a transient domain-wall foam that strongly scatters light. This foam comprises domains of molecules that have reoriented locally in the same sense on the smectic-C tilt cone and are separated from one another by 2-pi inversion walls. The dynamics of formation and the subsequent annealing of the foam have been probed using laser light scattering. Anisotropic coarsening of the foam, which is accounted for by including electrostatic (space-charge) interactions in the theoretical description of the ferroelectric liquid crystal, results in a striking pattern of elongated stripes. Stroboscopic microscopy reveals that these stripes are in general rotated from the smectic-layer planes in a chiral sense, the sense of the rotation depending on the sign of dE/dt.