In this paper, we report for the first time the determination of the real part of the third-order nonlinear susceptibility, x(3) (–ω, ω, 0, 0), measurements in the isotropic phase of a nematic liquid crystal 4ʹ-n-pentyl-4-cyanobiphenyl (KI 5) from electro-optic Kerr effect experiments . The value of x(3) obtained at 632.8 run is found to be 1 .08 × 10-18 m2 V-2 corresponding to a temperature 35. 5 ° C and is the highest so far reported to the best of our knowledge. © 1993 Taylor &amp; Francis Ltd.

Tetali A. Prasada Rao

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Third-order Susceptibility Measurements in a Nematic Liquid Crystal—K15

Journal of Modern Optics

We report for the first time the determination of the real part of the third order nonlinear susceptibilities χ(3) (-ω, ω, 0, 0) in the isotropic phase of two nematic liquid crystals p-(ethoxybenzylidine)-p-butylaniline (EBBA) and p-(methoxybenzylidene)-p-butylaniline (MBBA) from electrooptic Kerr effect experiments. The highest value of χ(3) observed near nematic-to-isotropic transition temperature, at 632.8 nm is found to be 1.067×10-20 m2V-2 for EBBA and 6.602×10-20 m2V-2 for MBBA. © 1992 Chapman &amp; Hall.

Optical and Quantum Electronics

Electrooptical Kerr constant and third-order susceptibility measurements in nematic liquid crystals and their mixtures

Measurements are reported on the oc Kerr response and the pre-transitional behaviour of a negative nematic liquid crystal—p-ethoxy-benzylidine-p-butylaniline (ebba)—at temperatures above the nematic-isotropic transition temperature. The observed second-order pre-transitional temperature 7* from our measurements is found to be within 1 °C below the first-order nematic-isotropic transition temperature. The observed dependence of the Kerr constant on (T- T*)”1 is found to be in good agreement with the predictions of the Landau-dé Gennes model. The pre-transitional temperatures have also been investigated in p-ethoxy benzylidine p-butyl aniline-p-methoxy benzylidene p-n-butyl aniline (ebba-mbba) liquid crystal mixtures. © 1992 IOP Publishing Ltd.

Journal of Physics D: Applied Physics

Transient Kerr Response in a Nematic Liquid Crystal

We report for the first time the determination of the real part of the third order nonlinear susceptibility χ(3)(-ω;ω,0,0) above the nematic to isotropic phase transition temperature of a nematic liquid crystal 4 (trans-4'-4'-n-pentylcyclohexy)-benzonirtile (PCH-5) from electro-optic Kerr effect experiments. The value of χ(3) observed at 632.8 nm is found to be 6.2079×10-19 m2 V -2 close to the phase transition temperature at 55.1°C.

Fulltext

Journal of Applied Physics

Nonresonant third order susceptibility measurements in a nematic liquid crystal-PCH-5

The performance of a high-voltage pulse measuring system based on the Kerr effect is investigated with benzoyl chloride, o-nitrotoluene, acetophenone, acetonitrile, benzaldehyde and ethyl methyl ketone for the first time along with nitrobenzene and acetone that are well known. These investigations have been carried out using high-voltage pulse fields ranging from 4*105 V m-1 to 107 V m-1. The experimentally determined electric field from the Kerr signal and the applied field show good agreement.

Measurement Science and Technology

A high-voltage pulse measuring system based on the Kerr effect

Measurement of Kerr constant and the non-resonant part of the static non-linear susceptibility χ(3)1212 (ω1,-ω1,o,o) in acetonitrile, benzaldehyde, acetophenone, acetone, ethyl methyl ketone, o-nitrotoluene, nitrobenzene, and benzoylchloride are reported. The variation of Kerr constant in nitrobenzene-benzene and o-nitrotoluene-benzene mixtures have also been experimentally determined for the first time for different molar fractions and compared with the theoretically obtained values using the mean field theory. The experimentally determined values of the dielectric constant(ε{lunate}) and the refractive index(n) have been used for the theoretical calculations. © 1991.

Journal	Journal of Modern Optics
ISSN	09500340
Open Access	No