Orientation of Nematic Liquid Crystals on Random Anchoring Surface

Aryasova, Natalie; Iljin, Andrey G.; Reshetnyak, Victor; Reznikov, Yuriy; Glushchenko, Anatoliy; West, John L.

doi:10.1080/10587250210593

Cited by 12 publications

(6 citation statements)

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“…Placing the LC layer between two polarizers, one can obtain the interference oscillations with the light intensity maxima and minima by changing the phase difference between the ordinary and extraordinary beams using an external electric or magnetic field under the conditions of the Frederiks transition [2]. In the misoriented LC layers, the birefringence effects can be observed without polarizers [3][4][5]. In [3], the interference maxima and minima were found using the monochromatic light.…”

Section: Introductionmentioning

confidence: 99%

Interference of nonpolarized light in liquid crystal domains on a polymer surface

et al. 2019

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The interference of the nonpolarized light transmitted through an ensemble of nematic liquid crystal domains formed on the polycarbonate surface has been investigated. A model based on the superposition of the ordinary and extraordinary beams passed through domains with the radial structure has been developed. Expressions for the phase difference and intensity of the interfering beams, which take into account the distribution of the liquid crystal director field, have been derived. The dependences of the optical transmittance of a domain layer on the applied voltage have been calculated with regard to the material and optical constants of a liquid crystal and structural features and averaged morphological parameters of individual domains in the experimental sample. The results of the calculation are consistent with the experimental data, which confirms the validity of the proposed model.

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Section: Introductionmentioning

confidence: 99%

Interference of nonpolarized light in liquid crystal domains on a polymer surface

et al. 2019

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“…Here, we therefore investigate the effects of disorder in the homeotropic easy direction at the bounding surfaces of a nematic LC film [24,25] on the interaction between them. Describing the surface disorder fields with a simple Gaussian distribution for the homeotropic easy direction (with an assumed width or variance) allows us grosso modo to capture the orientational anchoring disorder present at heterogeneous surfaces.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Casimir interactions across nematic films with disordered anchoring axis

Haddadan

Naji

Seifi

et al. 2014

J. Phys.: Condens. Matter

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We consider the effective pseudo-Casimir interaction forces mediated by a nematic liquidcrystalline film bounded by two planar surfaces, one of which imposes a random (disordered) distribution of the preferred anchoring axis in the so-called easy direction. We consider both the case of a quenched as well as an annealed disorder for the easy direction on the disordered surface and analyze the resultant fluctuation-induced interaction between the surfaces. In the case of quenched disorder, we show that the disorder effects appear additively in the total interaction and are dominant at intermediate inter-surface separations. Disorder effects are shown to be unimportant at both very small and very large separations. In the case of annealed disorder its effects are non-additive in the total inter-surface interaction and can be rationalized in terms of a renormalized extrapolation length.

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“…To check this, the dependence of the twist angle, test ϕ , on the exposure time t exp were measured (figure 6). The twist angle test ϕ determines the azimuthal anchoring energy, W, via the formula [42]:…”

Section: Resultsmentioning

confidence: 99%

Liquid crystal photoalignment on As₂S₃chalcogenide thin films

Sheremet

Sharpnack

Gelbaor-Kirzhner

et al. 2017

J. Phys. D: Appl. Phys.

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Recent studies of photoalignment of liquid crystals (LCs) on chalcogenide surfaces have a rich variety of mechanisms responsible for the photoalignment on these materials. Both chalcogenide surface-mediated and LC bulk-mediated photoalignment were observed. We report on investigation toward understanding the origin of the chalcogenide surface-mediated photoalignment. The contributions of light-induced optical and surface morphological anisotropy of the chalcogenide surface were studied. Light-induced optical anisotropy in the film was observed by polarization interferometry and the surface anisotropy was measured by high-resolution x-ray reflectivity. The data reveals the lack of a strong anisotropy in the surfaces’ morphology after irradiation with polarized blue light. At the same time, an evident correlation between the anchoring energy and the quality of the photoalignment was observed. This allows us to conclude that the photoalignment of LCs on chalcogenide surfaces is mainly determined by a light-induced anisotropic distribution of the glass structural elements in the bulk and on the chalcogenide surface.

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Orientation of Nematic Liquid Crystals on Random Anchoring Surface

Cited by 12 publications

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Interference of nonpolarized light in liquid crystal domains on a polymer surface

Interference of nonpolarized light in liquid crystal domains on a polymer surface

Pseudo-Casimir interactions across nematic films with disordered anchoring axis

Liquid crystal photoalignment on As₂S₃chalcogenide thin films

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Orientation of Nematic Liquid Crystals on Random Anchoring Surface

Cited by 12 publications

References 0 publications

Interference of nonpolarized light in liquid crystal domains on a polymer surface

Interference of nonpolarized light in liquid crystal domains on a polymer surface

Pseudo-Casimir interactions across nematic films with disordered anchoring axis

Liquid crystal photoalignment on As2S3chalcogenide thin films

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Liquid crystal photoalignment on As₂S₃chalcogenide thin films