Influence of Methyl Substituents on Azo-Dye Photoalignment in Thin Films

Mikulich, V. S.; Murawski, An. A.; Muravsky, Alexander; Agabekov, V. E.

doi:10.1007/s10812-016-0252-y

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…As illustrated in Figure a, during exposure, the intermolecular bonds of azo-dye molecules oriented along the polarization direction of the illuminated light are relaxed and reformed in the perpendicular direction, thus, inducing a preferential orientation of the bonds over time . This results in an in-plane prealignment of the LC molecules in the direction perpendicular to the polarization direction, with strong azimuthal anchoring energy of more than 2 × 10 –4 J/m 2 . This strong anchoring ability has been experimentally verified to show a long-time stability at 100 °C and is important for achieving long-term device operations .…”

Section: Resultsmentioning

confidence: 88%

“…36 This results in an in-plane prealignment of the LC molecules in the direction perpendicular to the polarization direction, with strong azimuthal anchoring energy of more than 2 × 10 −4 J/m 2 . 37 This strong anchoring ability has been experimentally verified to show a long-time stability at 100 °C and is important for achieving long-term device operations. 36 The prealignment direction can be readjusted by re-exposure with blue light with rotated polarization vector.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

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Electrically Tunable Transparent Displays for Visible Light Based on Dielectric Metasurfaces

et al. 2019

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Tunable dielectric metasurfaces able to manipulate visible light with high efficiency are promising for applications in displays, reconfigurable optical components, beam steering, and spatial light modulation. Infiltration of dielectric metasurfaces with nematic liquid crystals (LCs) is an attractive tuning approach, which is highly compatible with existing industrial platforms for optical and electronic devices. Here, we demonstrate electrically tunable transparent displays based on nematic LC-infiltrated tunable dielectric metasurfaces at visible frequencies. Importantly, the technique of photoalignment of LCs is adopted to improve the LC prealignment quality and thus the tuning accuracy and contrast in the visible. By applying a voltage across the infiltrated metasurface cell, we observe resonance shifts that are more than twice larger than their line width. We track the spectral shifts of the electric and magnetic dipole resonances as they move into and out of the so-called Huygens' regime of high transparency originating from spectrally overlapping electric and magnetic dipole resonances. Furthermore, we realize a switchable metasurface display with a measured modulation depth of 53% at 669 nm operation wavelength for an applied voltage of 20 V. The novel LC tuning platform demonstrated in our work may lead to the development of next-generation LC display devices that are able to overcome current limitations of minimal pixel size and speed of operation.

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Section: Resultsmentioning

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 92%

Electrically Tunable Transparent Displays for Visible Light Based on Dielectric Metasurfaces

et al. 2019

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“…In the process of work the authors have fabricated 1D and 2D fork-dislocation gratings based on the technology of layer patterned photoalignment of a polymerizable nematic liquid crystal (PLC) [17]. One-dimensional forked gratings were fabricated utilizing the photosensitive azo dye AtA-2 as an alignment material [18,19]. The The alignment properties of the selected azo dye were imparted on its irradiation by linearly polarized light with the wavelength λ = 465 nm the direction of the induced surface alignment being perpendicular to the activating radiation polarization direction.…”

Section: Methodsmentioning

confidence: 99%

Patterned Photoalignment-Based One- and Two-Dimensional Liquid Crystal Forked Gratings

Kabanova

Rushnova

Gorbach

et al. 2022

Nonlinear Phenomena in Complex Systems

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Based on the technology of patterned photoalignment of polymerizable nematic liquid crystal, one- and two-dimensional fork-dislocation gratings which enable formation of singular light beams (optical vortices) have been fabricated and examined. The proposed approach to the formation of a two-dimensional optical structure presents itself a combination of two one-dimensional gratings with mutually orthogonal orientations of the grooves. Phase structures of the formed singular beams as well as their spatial and polarization characteristics have been studied experimentally. The obtained results offer new potentialities in design of optical devices and systems for transformation of phase and polarization structures of light beams.

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“…Sandwich-type LC cells were fabricated by using glass substrates covered uniformly with a conducting layer of indium tungsten oxide (ITO) that had resistance of 50 Ohm/sq. Photosensitive AtA-2 azo dye [17] synthesized at the Materials and Technologies of LC Devices Laboratory at the Belarus National Academy of Sciences' of Institute of the Chemistry of New Materials was used as a photoaligned material. Thin films of AtA-2 azo dye were applied onto the thoroughly cleaned surfaces of substrates by means of rod coating using an automated laboratory facility [18].…”

Section: Methodsmentioning

confidence: 99%

Switchable Diffraction Gratings Based on the Periodic Binary Alignment of a Nematic Liquid Crystal

Kamiak

Kabanova

Rushnova

et al. 2021

Bull. Russ. Acad. Sci. Phys.

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The patterned photoalignment of nematic liquid crystal is used to produce one-dimensional diffraction gratings. The effect the orientation of molecules in adjacent liquid crystal domains has on the diffraction properties of the fabricated binary structures is established. Diffraction gratings based on the binary alignment of nematic liquid crystal are characterized by electrically switchable optical properties and control the spatial and polarization characteristics of light beams effectively.

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Influence of Methyl Substituents on Azo-Dye Photoalignment in Thin Films

Cited by 11 publications

References 29 publications

Electrically Tunable Transparent Displays for Visible Light Based on Dielectric Metasurfaces

Electrically Tunable Transparent Displays for Visible Light Based on Dielectric Metasurfaces

Patterned Photoalignment-Based One- and Two-Dimensional Liquid Crystal Forked Gratings

Switchable Diffraction Gratings Based on the Periodic Binary Alignment of a Nematic Liquid Crystal

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