Determination of ordinary and extraordinary refractive indices of nematic liquid crystals by using wedge cells
Determination of ordinary and extraordinary refractive indices of nematic liquid crystals by using wedge cells
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使用楔形池测定向列液晶的普通和非常折射率
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
K. Ogrodnik
中科院分区：
文献类型：
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作者：
J. Kędzierski;Z. Raszewski;M. Kojdecki;E. Kruszelnicki;P. Perkowski;W. Piecek;E. Miszczyk;J. Zieliński;P. Morawiak;K. Ogrodnik
本文提出并讨论了一种新的精确、快速测定液晶寻常折射率和非寻常折射率的干涉方法。该方法依赖于显微镜测量的干涉条纹之间的距离出现在偏振的平行相干单色光束传输正常的表面，通过一个楔形细胞充满了一个棱镜。两个玻璃板限制细胞涂有部分透明的金属薄膜，这是通过在真空中蒸发沉积。由于表面之间的多次反射和小的边缘角，在楔顶边缘附近观察到的干涉条纹是尖锐的和等距的。为了应用这种方法，只需要少量的研究液晶。文中还简要地讨论了基本的数学公式和实验结果。
A new accurate and fast interference method for determining ordinary and extraordinary refractive indices of nematic liquid crystals is presented and discussed. The method relies on microscopic measurements of distances between interference fringes appearing in polarised parallel coherent monochromatic light beam transmitted normally to the surfaces through a wedge cell filled with a nematic. Both glass plates confining the cell are coated with a partly transparent thin film of metal which is deposited by evaporation in vacuum. Owing to the multiple reflections between the surfaces and a small edge angle, the interference fringes observed near the wedge apex edge are sharp and equidistant. To apply this method one needs only small amount of an investigated liquid crystal. Basic mathematical formulae and results of an experiment are briefly discussed.