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Fundamental Study on Electroclinic Effect in Smectic A Liquid Crystals and the Application for Fast Optical Modulator

近晶A液晶电致效应的基础研究及快速光调制器的应用

基本信息

批准号：
63550227
负责人：
TAKEZOE Hideo
金额：
$ 1.28万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550227/
关键词：
ferroelectric liquid crystal electroclinic effect smectic A phase electro optic effect X-ray diffraction layer structure X線回折 X線線回折

项目摘要

In the first year of this project, we obtained the results that not only the molecular tilt but also the layer deformation are induced in the electroclinic effect.1. Using the cells whose layers are perpendicular to the glass surfaces, the X-ray diffraction experiments were carried out. The X-ray diffraction intensity was measured under an electric field as rotating the cell with the detector fixed at the Bragg angle of the inter layer spacing. With increasing the field, two peaks appeared at the symmetry positions and the separation became wide. This fact suggests that the chevron layer structure is formed by applying the field. It was confirmed that the layer tilt angle is nearly equal to the molecular tilt angle in the low field region.2. The above experiment gives information about the layer deformation perpendicular to the glass surfaces. The microscope observation, however, suggests the existence of the layer deformation parallel to the surfaces. To confirm this, it is necessary to observe the transmission Laue pattern. For this purpose, we are trying to detect the Laue pattern using the cells composed with very thin glasses. At this moment, the diffuse scattering due to the glasses prevents the observation of the Laue spot.3. Since the electroclinic effect is equivalent to the excitation of the soft mode in the paraelectric phase, we should observe the divergent increase of the dielectric constant as the temperature approaches to the phase transition point. We developed the automatic system for determining dielectric constant and confirmed the behavior.

在本计画的第一年，我们得到的结果是：在电斜效应中，不仅会诱发分子的倾斜，也会诱发层的变形.利用垂直于玻璃表面的衍射池进行了X射线衍射实验。X射线衍射强度在电场下测量，同时旋转单元，检测器固定在层间间距的布拉格角。随着电场的增加，在对称位置出现两个峰，分离变宽。这一事实表明，人字形层结构是通过施加场而形成的。证实了在低场区，层倾角与分子倾角几乎相等.上述实验给出了关于垂直于玻璃表面的层变形的信息。然而，显微镜观察表明存在平行于表面的层变形。为了证实这一点，有必要观察传输劳厄图案。为此，我们正试图使用由非常薄的玻璃组成的细胞来检测劳厄图案。此时，由于玻璃的漫散射，使劳厄斑的观察受到阻碍.由于电斜效应等效于顺电相软模的激发，我们应该观察到随着温度接近相变点，介电常数的发散增加。我们开发了介电常数自动测定系统，并确认了该行为。