液晶
材料科学
功率(物理)
光学
光电子学
物理
热力学
出处
期刊:Acta crystallographica /
[International Union of Crystallography]
日期:1951-05-01
卷期号:4 (3): 219-226
被引量:1081
标识
DOI:10.1107/s0365110x51000751
摘要
A group of liquid crystals, mainly derivates of cholesterol, shows remarkable optical properties, including strong rotatory power and selective reflexion of circularly polarized light in a narrow region of wave-lengths. In this paper it is shown how these properties can be explained by the assumption that the molecules are arranged in a special way, so that the electrical axes rotate screw-like. It is inessential whether this occurs in small steps or continuously. When the axes make one revolution over a thickness p, then light in a region around λ=pn will be reflected (n = refractive index). The second important parameter is the value of the double refraction α = (n 2 - n 1)/n. From p and α all optical properties can be calculated. No accurate data for testing the theory are available but qualitatively the agreement is complete.
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