Journal ArticleDOI
Transient Electro-Optic Kerr Effect in Liquid Crystalline Isothiocyanates
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TLDR
In this paper, the D.C. Kerr response and the pre-transitional behavior of two liquid crystalline isothiocyanates 4-(4 ′ -n-pentyl phenyl)-phenyl isothIocyanate (5NCS) and 4-( 4 ′ −n-heptylphenyl-phenyl)-isothIOCyanate(7NCS), at temperatures above the smectic-isotropic transition temperatures were investigated.Abstract:
Measurements are reported for the first time on the D.C. Kerr response and the pre-transitional behaviour of two liquid crystalline isothiocyanates 4-(4 ′ -n-pentyl phenyl)-phenyl isothiocyanate (5NCS) and 4-(4 ′ -n-heptyl phenyl)-phenyl isothiocyanate (7NCS) at temperatures above the smectic-isotropic transition temperatures. The Kerr law has been verified and the real part of the third order nonlinear susceptibilities (χ (3) ) above the smectic-isotropic transition are determined for the two liquid crystalline isothiocyanates from the electro-optic Kerr effect (EOKE) experiments. The variation of susceptibility with temperature has also been studied. The results have been compared with the cyanobiphenyls which have been widely studied and are known for their giant optical non-linearities.read more
References
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Nonlinear Susceptibility Constants and Self-Focusing of Optical Beams in Liquids
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The Order-Disorder Phase Transition in Liquid Crystals as a Function of Molecular Structure. I. The Alkyl Cyanobiphenyls
Harry J. Coles,C. Strazielle +1 more
TL;DR: In this paper, the authors studied the pretransitional behavior of a series of mesomorphic compounds, the alkyl cyanobiphenyls (CNρρC n H 2n + 1) for n = 5-12, and showed that the presence of the smectic A phase changes markedly the pret-ransitional behaviour, and gives rise to two distinct pret-transitional regions.
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