Journal ArticleDOI
Kerr Effect Investigations in Liquid Crystals Containing the Isothiocyanato and Cyano Groups with Identical Flexible Tails
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TLDR
In this article, the second-order phase-transition temperatures for 6CB, 6CHBT, 6PCH, and 6BOBT at temperatures greater than the nematicisotropic transition temperature were determined.Abstract:
Electro-optical Kerr effect data have been obtained for 6CB, 6CHBT, 6PCH, and 6BOBT at temperatures greater than the nematic–isotropic transition temperature. Using these data, the real parts of the third-order nonlinear susceptibility χ(3) are determined for all the liquid crystals. All the compounds had a positive Kerr constant, which increased with decreasing of temperature. The second-order phase-transition temperatures, T*, were determined for these compounds. The replacement of aromatic ring by a flexible cyclohexyl group or a bulkier bicyclooctane has a marked effect on the birefringence. Hexyl 4-(4-isothiocyanato-phenyl) bicycle [2 2 2] octane, 6BOBT, with the highest transition temperature, had the lowest Kerr constant. In contrast, hexyl cyanobiphenyl, 6CB, showed the largest Kerr constant (6BOBT → 6CHBT ≈ 6PCH → 6CB). The effect of the rigid core and polar head group of the liquid crystals was investigated.read more
Citations
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Journal ArticleDOI
Strong modulation of electric permittivity at an isotropic-nematic phase transition in a liquid crystal mixture for optical devices based on the Kerr effect
Mateusz Mrukiewicz,Paweł Perkowski,Rafał Mazur,Olga Chojnowska,Wiktor Piecek,Roman Dąbrowski +5 more
TL;DR: In this article, the dielectric and electro-optical properties of a new bicomponent mixture, which at room temperature exhibits an isotropic phase, were investigated.
Journal ArticleDOI
Prenematic Self-Assembling of Mesogenic Molecules in Isotropic Liquid and Orientational Order in Nematic Phase
TL;DR: In this article, an analysis of the static permittivity and the relaxation process related to the rotation of molecules around their short axis was performed in the frequency range from 50 kHz to 100 MHz in the nematic and isotropic phases.
Journal ArticleDOI
Phase diagram and electro-optical Kerr effect of nematic mixtures containingtolane and biphenyl cores
TL;DR: In this article, an experimental phase diagram for two types of nematic liquid crystals and their binary mixtures was established by polarised optical microscopy and differential scanning calorimetry methods.
Journal ArticleDOI
Kerr Effect Studies on Mixtures of the Two Tolane Base Liquid Crystals
TL;DR: The static Kerr effect and third order nonlinearity were investigated for mixtures of the tolane-base liquid crystals within the isotropic phase in the neighborhood of the nematic phase as discussed by the authors.
Journal ArticleDOI
Characterization of short-range molecular interaction by empirical solvent polarity scale to analyze the Kerr effect of nematic liquid crystals in the isotropic phase
TL;DR: In this article, an empirical solvent polarity scale (ETN) was employed to characterize the nonlinear electro-optic Kerr effect in the isotropic phase of NLCs.
References
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Journal ArticleDOI
Nonlinear Dielectric Polarization in Optical Media
TL;DR: The physical mechanisms which can produce second-order dielectric polarization are discussed on the basis of a simple extension of the theory of dispersion in ionic crystals in this paper.
Book
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Paul N. Butcher,David Cotter +1 more
TL;DR: In this paper, the constitutive relation between quantum mechanics and optical properties of artificial materials has been discussed, including the susceptibility tensors, symmetry properties, and wave propagation and processes in nonlinear media.
Journal ArticleDOI
Short Range Order Effects in the Isotropic Phase of Nematics and Cholesterics
TL;DR: In this article, the authors assume that the local state of order in the isotropic phase is a symmetric traceless tensor Qαβ, proportional to the anisotropic part of a tensor property such as the magnetic susceptibility.
Journal ArticleDOI
XL. A new relation between electricity and light: Dielectrified media birefringent
TL;DR: A new relation between electricity and light: dielectrified media birefringent was proposed in this article, where the authors proposed a dielectric media bifurcation.
Journal ArticleDOI
Laser and Electric Field Induced Birefringence Studies on the Cyanobiphenyl Homologues
TL;DR: In this paper, the optical and d.c. pulsed field Kerr effects have been used to study the pretransitional behaviour in the isotropic phase for the alkyl cyano-biphenyl homologues (CN φ.φ CnH2n+1) for n = 5-8.
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