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3. Photonic Devices with Multi-Domain Liquid Crystal Structures

Author

Kudreyko, Aleksey, Chigrinov, Vladimir, Neyts, Kristiaan, Chausov, Denis, Perestoronina, Arina, Kudreyko, Aleksey, Chigrinov, Vladimir, Neyts, Kristiaan, Chausov, Denis, and Perestoronina, Arina

Abstract

Photoalignment by azo dye nanolayers can provide high alignment quality for large-area liquid crystal devices. Application of this technology to active optical elements for signal processing and communications is a hot topic of photonics research. In this article, we review recent demonstrations and performance of liquid crystal photonic devices, discuss the advantages of the proposed technology, and identify challenges and future prospects in the research field of photoaligned multi-domain liquid crystal structures. We believe that the developments discussed here can provide directions for future research and potential opportunities for applications of liquid crystal devices based on multi-domain photoalignment. © 2024 by the authors.

Published
2024

5. Photoaligned Liquid Crystalline Structures for Photonic Applications

Author

Kudreyko, Aleksey, Chigrinov, Vladimir, Hegde, Gurumurthy, Chausov, Denis, Kudreyko, Aleksey, Chigrinov, Vladimir, Hegde, Gurumurthy, and Chausov, Denis

Abstract

With the advancement of information display technologies, research on liquid crystals is undergoing a tremendous shift to photonic devices. For example, devices and configurations based on liquid crystal materials are being developed for various applications, such as spectroscopy, imaging, and fiber optics. One of the problems behind the development of photonic devices lies in the preparation of patterned surfaces that can provide high resolution. Among all liquid crystal alignment techniques, photoalignment represents a promising non-contact method for the fabrication of patterned surfaces. In this review, we discuss the original research findings on electro-optic effects, which were mainly achieved at the Department of Electronic and Computer Engineering of the Hong Kong University of Science and Technology and the collaborating research laboratories.

Published
2023

7. Langmuir-Schaefer Films Based on Cyclotriphosphazene-Substituted Phthalocyanines: Supramolecular Organization, Uv/Vis Study, and Laser-Induced Nonlinear Absorption

Author

Kazak, Alexandr, primary, Nikitin, Konstantin, additional, Маrchenkova, Маrgarita, additional, Savelyev, Mikhail, additional, Vasilevsky, Pavel, additional, Gerasimenko, Alexander, additional, Yakushko, Egor, additional, Chausov, Denis, additional, Kholodkov, Igor, additional, Usol'tseva, Nadezhda, additional, and Tolbin, Alexander, additional

Published
2023
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9. New Structural Nanocomposite Based on PLGA and Al2O3 NPs as a Balance between Antibacterial Activity and Biocompatibility with Eukaryotic Cells

Author

Simakin, Alexander V., primary, Sarimov, Ruslan M., additional, Smirnova, Veronika V., additional, Astashev, Maxim E., additional, Serov, Dmitriy A., additional, Yanykin, Denis V., additional, Chausov, Denis N., additional, Shkirin, Alexey V., additional, Uvarov, Oleg V., additional, Rotanov, Evgeny, additional, Shakhovskoy, Andrey, additional, Bruskov, Vadim I., additional, Ivanov, Vladimir E., additional, Dorokhov, Alexey S., additional, and Izmailov, Andrey Y., additional

Published
2022
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10. Azodyes for liquid crystal photoalignment in displays and diffraction optical elements

Author

Chigrinov, Vladimir, Belyaev, Victor V., Kozenkov, Vladimir M., Chausov, Denis N., Margaryan, Hakob L., Hakobyan, Nune H., Tabiryan, Nelson V., Chigrinov, Vladimir, Belyaev, Victor V., Kozenkov, Vladimir M., Chausov, Denis N., Margaryan, Hakob L., Hakobyan, Nune H., and Tabiryan, Nelson V.

Abstract

Photoalignment on azo dye films is a simple and efficient way to achieve anisotropic ordering of molecules, which is promising to achieve ultra-thin high-performance dichroic polarizers. Besides, the photoalignment technique shows a unique advantage on patterned alignment applications, and enables the realization of advanced optical elements such as liquid crystal (LC) Dammann grating, LC Fresnel lens, holographic polarizers and bifocal optical-vortex lens. © 2022 SPIE.

Published
2022

12. Synthesis of a Novel, Biocompatible and Bacteriostatic Borosiloxane Composition with Silver Oxide Nanoparticles

Author

Chausov, Denis N., primary, Smirnova, Veronika V., additional, Burmistrov, Dmitriy E., additional, Sarimov, Ruslan M., additional, Kurilov, Alexander D., additional, Astashev, Maxim E., additional, Uvarov, Oleg V., additional, Dubinin, Mikhail V., additional, Kozlov, Valery A., additional, Vedunova, Maria V., additional, Rebezov, Maksim B., additional, Semenova, Anastasia A., additional, Lisitsyn, Andrey B., additional, and Gudkov, Sergey V., additional

Published
2022
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13. A Novel Biodegradable Composite Polymer Material Based on PLGA and Silver Oxide Nanoparticles with Unique Physicochemical Properties and Biocompatibility with Mammalian Cells

Author

Smirnova, Veronika V., primary, Chausov, Denis N., additional, Serov, Dmitriy A., additional, Kozlov, Valery A., additional, Ivashkin, Petr I., additional, Pishchalnikov, Roman Y., additional, Uvarov, Oleg V., additional, Vedunova, Maria V., additional, Semenova, Anastasia A., additional, Lisitsyn, Andrey B., additional, and Simakin, Alexander V., additional

Published
2021
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15. New Organosilicon Composite Based on Borosiloxane and Zinc Oxide Nanoparticles Inhibits Bacterial Growth, but Does Not Have a Toxic Effect on the Development of Animal Eukaryotic Cells

Author

Chausov, Denis N., primary, Burmistrov, Dmitriy E., additional, Kurilov, Alexander D., additional, Bunkin, Nikolai F., additional, Astashev, Maxim E., additional, Simakin, Alexander V., additional, Vedunova, Maria V., additional, and Gudkov, Sergey V., additional

Published
2021
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16. New Structural Nanocomposite Based on PLGA and Al 2 O 3 NPs as a Balance between Antibacterial Activity and Biocompatibility with Eukaryotic Cells.

Author

Simakin, Alexander V., Sarimov, Ruslan M., Smirnova, Veronika V., Astashev, Maxim E., Serov, Dmitriy A., Yanykin, Denis V., Chausov, Denis N., Shkirin, Alexey V., Uvarov, Oleg V., Rotanov, Evgeny, Shakhovskoy, Andrey, Bruskov, Vadim I., Ivanov, Vladimir E., Dorokhov, Alexey S., and Izmailov, Andrey Y.

Subjects
ALUMINUM oxide, CYTOCOMPATIBILITY, EUKARYOTIC cells, ANTIBACTERIAL agents, METALLIC oxides, PACKAGING materials, ALUMINUM foam
Abstract

Development of eco-friendly and biodegradable package materials is an important goal of modern science and international industry. Poly(lactic)-co-glycolic acid (PLGA) is suitable for this purpose. However, biocompatible materials may be contaminated with bacteria. This problem may be solved by the addition of metal oxides nanoparticles (NPs) with antibacterial properties. Although metal oxides NPs often show cytotoxicity against plant and mammalian cells, a new nanocomposite based on PLGA and aluminum oxide (Al2O3) NPs has been developed. The PLGA/Al2O3 NP composite has pronounced antibacterial properties. The addition of Al2O3 NPs 0.01% inhibited growth of E. coli for >50%. The antimicrobial effect of Al2O3 NPs is implemented through the generation of reactive oxygen species and damage of bacterial proteins and DNA. The biocompatibility of the nanocomposite with plant and mammalian cells was studied. The PLGA/Al2O3 NP composite did not influence the growth and development of tomatoes and cucumbers. PLGA and its composite with Al2O3 NPs 0.001–0.1% did not influence viability and proliferation of mammalian cells, on their density or substrate colonization rate. The developed nanocomposite has controlled mechanical properties, high antibacterial activity and high biocompatibility, which makes it an attractive candidate for building and food package material manufacture and agriculture. [ABSTRACT FROM AUTHOR]

Published
2022
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23. Dielectric Properties of Liquid Crystals for Display and Sensor Applications

Author

Belyaev, Victor V., Chausov, Denis N., Kurilov, Alexander D., Rybakov, Dmitriy O., Solomatin, Alexey S., Murauski anatoli a., Muravsky alexander a., Chigrinov, Vladimir G, Fan fan, Belyaev, Victor V., Chausov, Denis N., Kurilov, Alexander D., Rybakov, Dmitriy O., Solomatin, Alexey S., Murauski anatoli a., Muravsky alexander a., Chigrinov, Vladimir G, and Fan fan

Abstract

Temperature dependence of dielectric properties of nematic liquid crystals are investigated for two types of devices: wide temperature range liquid crystal displays and capacitor temperature sensor. © 2015 Society for Information Display.

Published
2015

28. Polar and azimuthal anchoring energy of liquid crystals

Author

Dadivanyan, Artem K., Pashinina, Yu M., Noah, O.V., Belyaev, Victor V., Chigrinov, Vladimir G., Chausov, Denis N., Dadivanyan, Artem K., Pashinina, Yu M., Noah, O.V., Belyaev, Victor V., Chigrinov, Vladimir G., and Chausov, Denis N.

Abstract

The interaction energy between mesogenic molecules (diphenyl, pentylbiphenyl and 4-n-octyl-4′-cyanebiphanyl) and the graphite and PE surface has been calculated using atom-atom potentials method. Polar and azimuthal anchoring energies are obtained and their dependences on the order parameter were derived. The good coincidence of calculated values of anchoring energies as well as of their dependences on the order parameter with experimental data is shown.

Published
2011

32. Holograms Recording in AZO Nematic Liquid Crystal and in its Solid Polymer Solutions.

Author

Kozenkov, Vladimir M., Spakhov, Aleksei A., Belyaev, Victor V., and Chausov, Denis N.

Subjects
ZINC oxide, NEMATIC liquid crystals, POLYMERS
Abstract

Methods of holographical images recording in nematic LC are proposed. Kinetic performances have been investigated for induced phase transition "nematic-isotropic liquid" in the layers of LC-440D, based on a mixture of liquid crystal (LC) azoxy compounds. Different cases of the absorption of polarized or unpolarized radiation were realized. Spectral changes of LC-440D, as well as the influence of activating radiation wavelength (365 and 405 nm) on the change in the transmission of the LC cell (10 μm thick) with rubbed polymer layers as orientants have been measured. At the same time the kinetics of changes in the intensity of light scattering on it in the transparency (λ = 632.8nm) formed by the spatial anisotropy of the diffraction pattern in the cross section of the probe beam was measured. Holograms are recorded in layers of solid mixtures of molecular solutions LC-440D (12 wt. %) of polymetyl metacrylate that were stored in a few hours, whereas in the pure LC-440D they disappeared in a few minutes. [ABSTRACT FROM AUTHOR]

Published
2016
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35. Measurement of the LC Pretilt Angle and Polar Anchoring in Cells with Homogeneous and Inhomogeneous LC Director Configuration and Weak Anchoring on Organosilicon Aligning Films.

Author

Belyaev, Victor V., Solomatin, Alexey S., Chausov, Denis N., and Gorbunov, Artem A.

Subjects
LIQUID crystals, LIQUID crystal displays, ORGANOSILICON compounds, MOLECULAR structure, STATISTICAL reliability
Abstract

New optical and electro-optical methods of LC director average tilt angle measurement are described in LC cells with homogeneous and inhomogeneous LC director distribution. The LC pretilt on both LC substrates can have the same or opposite direction. Both LC pretilt angle and polar anchoring energy values have been measured for both polar and weak polar liquid crystal materials on aligning films of organosilicon compounds (OC) of different molecular structure. The method developed can be used also in optical compensator design. [ABSTRACT FROM AUTHOR]

Published
2012
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