Linear electro‐optic effect based on flexoelectricity in a cholesteric with sign change of dielectric anisotropy
Linear electro‐optic effect based on flexoelectricity in a cholesteric with sign change of dielectric anisotropy
复制标题
基于介电各向异性符号变化的胆甾型弯曲电的线性电光效应
DOI：
10.1063/1.358523
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发表时间：
1994
影响因子：
3.2
通讯作者：
S. Lagerwall
中科院分区：
文献类型：
--
作者：
P. Rudquist;M. Buivydas;L. Komitov;S. Lagerwall
短节距胆固醇中的线性电光效应是基于介质与外加电场的线性耦合。它有许多显著的特性。电场导致光轴在平行于单元玻璃板表面的平面中倾斜，从而给出与近晶C* 相（表面稳定的铁电液晶和变形螺旋模式）和近晶A* 相（软模式/电斜效应）中的电光效应相同的对称性。对于快门和显示器，这保证了非常宽的视角。感应倾斜是所施加的场的线性函数，至少对于小场而言，这给出了良好控制的连续灰度。此外，它实际上与温度无关。100 μs量级的响应时间很容易实现。这种效应中最有趣的发展将是将线性机制扩展到更大的倾斜角，特别是22.5°，其中光可以从100%调制到零透射。
The linear electro‐optic effect in short‐pitch cholesterics is based on the linear coupling of the medium with an applied electric field. It has a number of remarkable properties. The electric field causes the optic axis to tilt in a plane parallel to the surfaces of the cell glass plates, giving the same symmetry as the electro‐optic effects in the smectic C* phase (surface stabilized ferroelectric liquid crystals and deformed helix mode) and the smectic A* phase (soft mode/electroclinic effect). For shutters and displays this guarantees a very wide viewing angle. The induced tilt is a linear function of the applied field, at least for small fields, which gives a well‐controlled continuous grey scale. Furthermore, it is practically independent of temperature. Response times of the order of 100 μs are easily achievable. The most interesting development in this effect would be to extend the linear regime to much larger tilt angles, in particular to 22.5°, where light could be modulated from 100% to zero tr...