Photosensitive Polymers for Liquid Crystal Alignment

Mahilny, U. V.; Станкевич, А. И.; Trofimova, Alexandra; Muravsky, Alexander; Murauski, Anatoli

doi:10.1016/j.phpro.2015.09.131

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…Ultraviolet irradiation causes photocrosslinking of GBP and increases both azimuthal and polar anchoring energies of the planar alignment domains . The latter effect results in a gradual reduction of the pretilt angle from 90° to 0° (Fig.…”

Section: Modeling Of Pretilt Angle Generationmentioning

confidence: 99%

“…Photosensitive benzaldehyde polymers (BP) have found their application for optical phase polarization recording and as alignment materials for LC due to high photo and thermal stability, as well as the moisture resistance of the recorded image. Photochemical reaction of the BP causes photocrosslinking under the influence of ultraviolet (UV) radiation during which chemical bonds formed by products of photo‐reduction of benzaldehyde groups transform the polymer into an insoluble net state .…”

Section: Introductionmentioning

confidence: 99%

“…Photochemical reaction of the BP causes photocrosslinking under the influence of ultraviolet (UV) radiation during which chemical bonds formed by products of photo‐reduction of benzaldehyde groups transform the polymer into an insoluble net state . Surface anisotropy of benzaldehyde‐containing polymer layers is achieved either by means of contactless – photoalignment technology with polarized UV exposure, or contact photostimulated rubbing alignment technology, with homogeneous rubbing of the polymer layer with a cloth followed by unpolarized UV exposure …”

Section: Introductionmentioning

confidence: 99%

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Alignment materials with controllable anchoring energy

et al. 2018

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New polymers with photo-controllable anchoring energy and tunable pretilt angle within 90°-0°range for nematic liquid crystals alignment were developed. The functional properties of polymers are provided by the effect of photoinduced planar alignment and the presence of side hydrocarbon chains in macromolecules that create a homeotropic alignment effect. Applying photosensitive alignment layers based on polymers with side benzaldehyde and hydrocarbon groups, fabrication of optical devices with refractive index gradient, uniform cell gap, and low operation voltage is possible. The developed materials are suitable for simple fabrication of tunable liquid crystal lenses.

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Section: Modeling Of Pretilt Angle Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Alignment materials with controllable anchoring energy

et al. 2018

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“…The LC layer thickness was set at d = 20 µm. The initial planar alignment of the LC director along z-axis was realized by photostimulated rubbing of photosensitive benzaldehyde polymer films [11]. Filling of the cell with a nematic LC material (n o = 1.49, n e = 1.67 at λ = 632.8 nm) was performed under isotropic phase condition (T = 75 • ).…”

Section: Electrically Switchable Lc Waveguides Based On Patterned Ele...mentioning

confidence: 99%

Nematic Liquid Crystal Waveguides for Spatial Control of Linearly Polarized Light Waves

Kabanova

Rushnova

Melnikova

et al. 2019

2019 PhotonIcs &Amp; Electromagnetics Research Symposium - Spring (PIERS-Spring)

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Electrically switchable liquid crystal (LC) waveguide structures for spatial-polarization control of light waves become more and more widespread as optical components for waveguide photonics. The motivation of the work was to design and fabricate miniaturized, low-cost electrically switchable LC waveguides for spatial control of linearly polarized light beams. With the use of new configurations of the spatially modulated electric field applied to planar-aligned sandwich-type LC cells (d = 20 µm thick), the polarization-sensitive waveguide structures performing the functions of optical splitter and adder were designed and experimentally studied. The current-conducting glass substrates coated with patterned electrodes (splitter-shaped and adder-shaped chromium layers) were used to control the optical properties of LC waveguides by applying an external low-frequency (1 kHz) electrical voltage to the LC cell electrodes. The operation principle of the fabricated optical components is based on the effect of total internal reflection (TIR) of laser radiation from the electrically controlled refractive interface between LC areas with orthogonal director orientations. Optical components of this type look promising for the production of competitive low power consumption photonic devices with enhanced functional characteristics.

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“…their surfaces. Experiments to create a photostimulated rubbing orientation and photoorientation[6], characteristic for benzaldehyde polymers, have not revealed the effect. Photosensitive benzaldehyde fragments provide photocrosslinking of the material under the influence of UV radiation, making it resistant to the action of organic solvents.…”

mentioning

confidence: 99%