Conformational Optical Nonlinearity of Nematic Liquid Crystals

Pinkevich, I. P.; Reznikov, Yuriy; Reshetnyak, Victor; Yaroshchuk, O.

doi:10.1142/s0218199192000224

Cited by 19 publications

(16 citation statements)

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“…Most previous experiments showed that the addition of the Sn 2 P 2 S 6 nano-particles leads to an increase in the clearing temperature of the multi-component LC [3,7,[13][14][15], but a decrease of T c in some experiments was also observed [8,9]. In order to identify whether the sign of T c , and accordingly,S col is caused by changes in the composition of the multi-component mixtures [3,[7][8][9][13][14][15], or exists also in a single component LC, we have measured the values of T c in seven samples of Sn 2 P 2 S 6 particles dispersed in 5CB and compared them with T c of the pure 5CB.…”

Section: Resultsmentioning

confidence: 99%

“…In order to identify whether the sign of T c , and accordingly,S col is caused by changes in the composition of the multi-component mixtures [3,[7][8][9][13][14][15], or exists also in a single component LC, we have measured the values of T c in seven samples of Sn 2 P 2 S 6 particles dispersed in 5CB and compared them with T c of the pure 5CB. Despite identical fabrication procedure, in some cells we observed an increase of the average order parameter and clearing temperature of the LC while in others we observed a decrease (table 1).…”

Section: Resultsmentioning

confidence: 99%

“…It was also shown that the functionS(τ ) did not depend on the chemical structure of the additives and coincided with the dependenceS 0 (τ ) for the pure LC matrix. Later, Pinkevich et al [13] showed that this universality follows from the standard Grandjean-Maier-Saupe (GMS) molecular field theory. The sign of the shift of τ and T c is determined by the relationship between the amplitude of inter-molecular interaction of LC molecules, G lc−lc , and the amplitude of interaction "LC molecule -additive molecule", G lc−imp .…”

Section: Introductionmentioning

confidence: 99%

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Nano-colloids of Sn_{2}P_{2}S_{6} in nematic liquid crystal pentyl-cianobiphenile

Kurochkin¹,

Atkuri²,

Buchnev³

et al. 2010

Condens. Matter Phys.

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It has been shown experimentally that the ferroelectric nano-particles, in common with other molecular additives, shift the clearing temperature, Tc, extending or reducing the two-phase coexistent region and changing the average order parameter of the single-component nematics. An increase of up to 11 • C or a smaller decrease of as much as 3 • C of Tc, and corresponding changes of the order parameter were observed. In all cases the order parameter of the colloid followed the universal temperature behaviour, which is a characteristic of LCs with molecular additives.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nano-colloids of Sn_{2}P_{2}S_{6} in nematic liquid crystal pentyl-cianobiphenile

Kurochkin¹,

Atkuri²,

Buchnev³

et al. 2010

Condens. Matter Phys.

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“…Thus, a change in the refractive index ∆n ∼ 10 −2 leads to a considerable change in the director deviation ϕ 0 . In practice this means that changes in the refractive index due to the laser-induced heating of the liquid crystal [21] or molecular phototransformations [22] influence the amplitude of the surface director deviation. This also means that the cell thickness should be tuned rather precisely in order for the surface director orientation to be observed.…”

Section: A Linear Polarization Of the Incident Lightmentioning

confidence: 99%

Nematic director slippage: Role of the angular momentum of light

et al. 2000

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We propose a theoretical model of the light-induced director slippage effect. In this effect the bulk director reorientation contributes to the surface director reorientation. It is found that the director and ellipticity profiles, obtained in the geometric optics approximation, are dependent on the ellipticity of the incident light wave. The director distribution is spatially modulated in linearly polarized light but grows monotonically in circularly polarized light. The surface director deviation has been examined, and comparison made with existing experimental data, which then permits the magnitude of the orientational nonlinearity coefficient to be calculated.

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“…It was also shown that the function SðtÞ did not depend on the chemical structure of the impurities and coincided with the dependence S 0 ðtÞ for the pure LC matrix. Later, Pinkevich et al [48] showed that this universality follows from the standard Grandjean-Maier-Saupe (GMS) The same dependences in the reduced temperature coordinates [45]. molecular field theory.…”

Section: ð12:7þmentioning

confidence: 96%

Ferroelectric Colloids in Liquid Crystals

Reznikov

2012

Liquid Crystals Beyond Displays

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INTRODUCTIONFor many years the science of liquid crystals mostly served the needs of liquid crystal display (LCD) industry; vast majority of funds and human resources were directed to development of numerous LCD modes in nematic liquid crystals (LCs). It was the needs of LCD industry that initiated rapid development of surface LC science, deep studies of correlation between the molecular structures and macroscopic properties of nematic LCs. Studies of more complicated LCs phases and composite LC materials to a large extent have also been initiated by numerous attempts to propose competitive alternative to the traditional nematic LCDs (e.g. PDLCs, bistable LCDs, ferroelectric LCDs). By the beginning of the last decade, the LCD industry has reached such a high level that its further progress has become determined mainly by development of the technology of non-LC components (for example, by fabrication of gigantic highquality glass substrates for the last generation LCDs). This initiated some kind of rebooting of the scientific and mercantile interests of the LC scientific community. There are many sectors of hi-tech industry where LCs have great potentials, such as biotech, telecommunication, and optical processing. The new applications require new materials, sometimes with rather exotic properties, and new technologies. For example, LC materials for telecommunications usually require LCs with strong birefringence but low refractive index, adaptive LC optics needs materials with huge birefringence and low viscosity. Many promising applications of LC for terahertz region are suppressed by a strong absorption of LCs in this region; biotech needs replacement of thermotropic LCs to water-based lyotropic LCs. Tiny and precise patterning of LC alignment over the boundary surfaces becomes crucial for developing new optical elements. All of these new industry needs changed the priority points of LCs science; a number of LCD-related publications steadily decrease in expense of publications on application of LCs in photonics, optical processing, biosensors, and magneto-optics.One of the directions of the development of the modern LCs science is design and study of numerous LC composite materials. Long-distance orientation interaction in mesophase leads to extremely strong influence of a dispersed material on the mesogenic properties of the LC and vice versa; the LC matrix can effectively arrange the positional and translational ordering of the inclusions in the matrix. Therefore, combination of the orientational ordering and relative translation freedom in LCs with properties of the dispersed materials allows scientists to give unique properties to the composite, which are not inherent to its components. In order to obtain synergetic properties, part of the dispersion material in a LC matrix should not be high. Apparently, Brochard and de Gennes [1] first suggested that doping of a nematic LC with elongated submicron ferromagnetic particles in very low volume fraction (f n 10 À3 ) should result in drastic increase of the LC ...

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Conformational Optical Nonlinearity of Nematic Liquid Crystals

Cited by 19 publications

References 0 publications

Nano-colloids of Sn_{2}P_{2}S_{6} in nematic liquid crystal pentyl-cianobiphenile

Nano-colloids of Sn_{2}P_{2}S_{6} in nematic liquid crystal pentyl-cianobiphenile

Nematic director slippage: Role of the angular momentum of light

Ferroelectric Colloids in Liquid Crystals

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