手性近晶相液晶的铁电有序和电斜效应
Ferroelectric ordering and electroclinic effect in chiral smectic liquid crystals
摘要：
利用线性电光和二次谐波技术研究了薄平面铁电液晶（FLC）盒中的铁电有序、电斜效应和手性近晶C（SmC*）-近晶A（SmA*）相变。通过测量线性和非线性响应的方位角依赖性，在偏置的FLC单元中检测铁电开关。所施加的DC-电场使FLC对称轴旋转，初始和最终取向在单元平面中。在反射和透射的切换行为的比较研究允许区分的贡献，从散装和次表面层的细胞。温度依赖性的分析表明，存在一个强的表面耦合。温度相关的非线性极化表现出与超流模型相对应的临界行为。
英文摘要：
Ferroelectric ordering, the electroclinic effect and chiral smectic C (SmC*) - smectic A (SmA*) phase transitions in thin planar ferroelectric liquid crystal (FLC) cells are studied by means of linear electrooptic and second harmonic generation techniques. The ferroelectric switching is detected in biased FLC cells by measuring azimuthal dependences of linear and nonlinear responses. The applied DC-electric field rotates the FLC symmetry axis with initial and final orientations in the cell plane. Comparative studies of the switching behavior in reflection and transmission allows to distinguish the contributions from the bulk and the sub-surface layers of the cell. The analysis of temperature dependence shows the existence of a strong surface coupling. The temperature dependent nonlinear polarization shows a critical behavior corresponding to the superfluid model.
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