Determination of symmetry and molecular arrangements of free-standing liquid crystal films using null-transmission ellipsometry |
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| Authors: | D A Olson X F Han P M Johnson A Cady C C Huang |
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| Institution: | 1. Department of Chemistry , Nankai University , Tianjin, China hanjie@nankai.edu.cn;3. Department of Chemistry , Nankai University , Tianjin, China |
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| Abstract: | A high resolution null-transmission ellipsometry system has been developed for measurement of the optical properties of liquid crystal free-standing films. The ellipsometric parameters are measured to within a resolution of 0.002° from samples held in a sealed, temperature-controlled environment. By measuring the ellipsometric parameters as a function of applied electric field orientation, the optical symmetry and molecular orientations of free-standing liquid crystal films can be determined in some cases. Three carefully selected applications of this technique are presented. |
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| Keywords: | heterocyclic liquid crystal spectroscopic property cholesteric mesophase synthesis |
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