Neha Yadav, Deepti Goel, Awdhesh K. Yadav, Amit Choudhary, Rajesh, Ashok M. Biradar, Surinder P. Singh
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引用次数: 0
摘要
我们报告了表面稳定的铁电液晶在一定温度和可控测量场强下的表面模式主导下的晶谱层重新定向过程。在加热和冷却循环中,通过介电光谱和光学纹理分析同时研究了这一过程。首先,通过施加 0.5 V 的偏压(因为此处的材料较软),在低于 Tc 值 1-2 oC 的温度下调整晶格层的方向,然后在没有偏压场的情况下将样品冷却到室温,我们称之为处理过的样品池。在第二种情况下,电池温度刚好高于 Tc,在冷却循环中进行测量,我们称之为未处理电池。我们观察到,在材料的加热和冷却循环过程中,由于重新定向的胶凝分层和有助于重新定向的表面效应,会产生明显的分子动态变化。我们还观察到,在加热循环中,表面效应现象占主导地位,而在冷却循环中,表面效应则较弱。有时会发现,在电场作用下加热和冷却样品会因胶粘层的重新调整而影响样品的光学性能。这项研究可能会阐明表面效应对层重新定向的控制,并为其在显示器和光通信设备中的应用提供可能。
Smectic layer reorientation by surface mode in surface stabilized ferroelectric liquid crystal
We report the smectic layer reorientation process in a surface-stabilized ferroelectric liquid crystal subject to the surface mode dominance at certain temperature and application of the controlled measuring field strength. The process is investigated by dielectric spectroscopy and optical textures analysis simultaneously in heating and cooling cycle. First the smectic layers are reoriented just 1–2 oC below Tc by applying a bias of 0.5 V as the material is soft here and cooled the sample to room temperature in absence of bias field which we call this a treated cell. In second type, the cell was taken to just above the Tc and taken the measurement in cooling cycle which we call an untreated cell. We have observed that there is a distinct molecular dynamic in the heating and cooling cycles of the material due to reoriented smectic layering and surface effect which assists the reorientation. It has also been observed that in heating cycles, the surface effect phenomenon is dominant, and in cooling cycles, it is weaker. Sometimes, the heating and cooling of the sample under electric field has been found affecting the optical performance of sample due to the readjustment of smectic layers. This study may clarify the control over the layer reorientation by surface effect and may open the possible application in displays and optical communication devices.
期刊介绍:
Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.