Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 45, Issue 37-41, Pages L1013-L1015Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.45.L1013
Keywords
banana liquid crystal; nematic phase; pretilt angle; birefringence; dielectric constant; order parameter
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We report the first detailed optical and electrical characterizations of the nematic (N) phase of a banana liquid crystal, i.e., pretilt angle, and optical and dielectric anisotropies, and point out the difference from those of rodlike molecules. The pretilt angle measurements using a conventional crystal rotation method show that the pretilt angle is very small (less than 1 degrees) even in cells with a polyimide film yielding a high pretilt angle like 8 degrees for calamitic molecules. We also measured the birefringence An in the N phase as a function of temperature and estimated the orientational order parameter S. The medium shows a small negative dielectric anisotropy in the N phase and the anisotropy becomes large in the B2 phase mainly because of the tilt of the molecules from the layer normal.
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