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Title: Kerr constant and third-order nonlinear optic susceptibility measurements in a liquid crystal composed of bent-shaped molecules
Authors: Dhara, Surajit
Araoka, Fumito
Lee, Mongryong
Van Le, Khoa
Guo, Lingfen
Sadashiva, B.K.
Song, Kigook
Ishikawa, Ken
Takezoe, Hideo
Issue Date: 2008
Publisher: American Physical Society
Citation: Physical Review E, 2008, Vol.78, 050701
Abstract: We report the determination of the Kerr constant (B) and the real part of the third-order nonlinear optic susceptibility (chi(3)) above the nematic-isotropic phase transition temperature (TNI) of a liquid crystal composed of bent-shaped molecules. The values of B and chi(3) just above (~0.3 °C) TNI are ~8×10−12 m/V2 and 5×10−20 m2/V2, respectively. The estimated critical temperature T<sub>C</sub><sup>*</sup> is about 1.5 °C below TNI indicating that the nematic-isotropic (NI) transition is weakly first order as in the case of calamitic liquid crystals. The temperature-dependent Kerr constant is found to be in good agreement with the predictions of the Landau–de Gennes theory. The experimental results are compared with those in a calamitic liquid crystal material with negative dielectric anisotropy in the nematic phase.
Description: Open Access.
ISSN: E-ISSN: 1550-2376
P-ISSN: 1539-3755
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Copyright: 2008 The American Physical Society
Appears in Collections:Research Papers (SCM)

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