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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Krakhalev M. N., Timofeev I. V., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical modes of multilayered photonic structure containing nematic layer with abnormal electroconvective rolls
Место публикации : Opt. Mater. - 2020. - Vol. 100. - Ст.109630. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2019.109630
Примечания : Cited References: 30. - We are grateful to M.N. Volochaev for providing TEM micrograph of the mirror
Аннотация: Optical modes of a multilayered photonic structure with the twisted nematic liquid crystal as a defect layer have been investigated. The electroconvective flow in the nematic makes a spatially periodic structure in the form of abnormal rolls. Non-adiabatic propagation of polarized light in the defect layer causes unique features of the optical modes corresponding to the ordinary o-waves. The decay of these modes has been demonstrated with increasing voltage due to the effect of cross-polarization diffraction loss. The modes short-wave shift resulting from the contribution of the non-adiabatic geometric phase to the total phase delay of the wave during a round-trip propagation through the photonic structure has been found both experimentally and numerically.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Krakhalev M. N., Timofeev I. V., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical modes of multilayered photonic structure containing nematic layer with abnormal electroconvective rolls [Electronic resource]
Место публикации : ArXiv. - 2019. - Ст.1912.00368
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 30. - We are grateful to M.N. Volochaev for providing TEM micrograph of the mirror.
Предметные рубрики: Optics
Аннотация: Optical modes of a multilayered photonic structure with the twisted nematic liquid crystal as a defect layer have been investigated. The electroconvective flow in the nematic makes a spatially periodic structure in the form of abnormal rolls. Non-adiabatic propagation of polarized light in the defect layer causes unique features of the optical modes corresponding to the ordinary o-waves. The decay of these modes has been demonstrated with increasing voltage due to the effect of cross-polarization diffraction loss. The modes short-wave shift resulting from the contribution of the non-adiabatic geometric phase to the total phase delay of the wave during a round-trip propagation through the photonic structure has been found both experimentally and numerically.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Кузьменок Н. М., Михалёнок С. Г., Орёл А. С., Shevchuk M. O., Bezborodov V. S., Крахалев, Михаил Николаевич, Сутормин, Виталий Сергеевич, Прищепа, Оксана Олеговна, Жаркова Г. М., Zyryanov V. Ya.
Заглавие : Синтез органилтрифенилфосфоний галогенидов, четвертичных аммонийных солей и исследование их применения в качестве сурфактантов, растворимых в жидких кристаллах
Место публикации : Жидк. кристаллы и их практич. использ. - 2020. - Т. 20, № 1. - С. 6-18. - ISSN 1991-3966, DOI 10.18083/LCAppl.2020.1.6; Liq. Cryst. Appl.
Примечания : Библиогр.: 18. - Работа выполнена частично при финансировании по проекту междисциплинарных интеграционных исследований СО РАН.
Аннотация: Синтезированы четвертичные аммонийные соли и органилтрифенилфосфоний галогениды, ионы которых могут оказывать ориентирующее воздействие на жидкие кристаллы. Исследована растворимость полученных соединений в нематическом жидком кристалле – 4-пентил-4'-цианобифениле (5ЦБ). Показано, что две аммонийные соли не только растворяются в нематике, но и диссоциируют на ионы. При этом анионы, перемещаясь в электрическом поле, способны модифицировать граничные условия, что открывает возможность использования данных соединений для ионно-сурфактантного метода управления жидкокристаллическими материалами.Quaternary ammonium salts and organotriphenylphosphonium halides have been synthesized. Their ions can have an orienting effect on liquid crystals. The solubility of the obtained compounds in the nematic liquid crystal - 4-cyano-4'-pentylbiphenyl (5CB) has been studied. It was shown that two ammonium salts both dissolve in the nematic and also dissociate into ions. At that, the anions moving in electric field can modify the boundary conditions. This fact allows using these compounds for the ion-surfactant method of controlling liquid crystal materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Small-angle scattering and radiation polarization by a stretched polymer film with nematic liquid crystal droplets having a single-domain structure
Коллективы : Belarusian Republican Foundation for Fundamental Research [F18RA-003]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk krai; Krasnoyarsk Krai Foundation of Science [18-42-243006]
Место публикации : Opt. Spectrosc. - 2020. - Vol. 128, Is. 3. - P.331-338. - ISSN 0030-400X, DOI 10.1134/S0030400X20030121. - ISSN 1562-6911(eISSN)
Примечания : Cited References: 24. - This work was carried out within the framework of the agreement on interacademic collaboration between the National Academy of Sciences of Belarus and Siberian Branch of the Russian Academy of Sciences. It was supported by the Belarusian Republican Foundation for Fundamental Research (project no. F18RA-003). M.N. Krakhalev acknowledges the support of the Russian Foundation for Basic Research, the Government of Krasnoyarsk krai, and Krasnoyarsk Krai Foundation of Science (grant no. 18-42-243006).
Предметные рубрики: IONIC MODIFICATION
LIGHT
Аннотация: The coefficient of directed transmittance of a stretched polymer-dispersed liquid crystal film with a defect-free single-domain liquid crystal droplet structure formed by a stretched surfactant-doped film and the polarization degree of forward-transmitted light in the visible and near-infrared spectrum ranges are studied. Results are presented for the 5CB, E7, and E44 nematic liquid crystals. Dependences of the transmission coefficient and polarizing ability of the film on the photodetector field of view are studied. Relationships allowing one to determine film parameters at which the transmission coefficient and polarizing ability of the films simultaneously reach values close to limit ones (0.5 and ±1.0, respectively) are obtained in the Foldy–Twersky and anomalous diffraction approximations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Sutormin V. S., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Polar anchoring energy and tilt angle measured by magneto-optical technique in nematic doped with ionic surfactant
Место публикации : Liq. Cryst. - 2020. - Vol. 47, Is. 12. - P.1825-1831. - ISSN 0267-8292, DOI 10.1080/02678292.2020.1733683. - ISSN 1366-5855(eISSN)
Примечания : Cited References: 32
Предметные рубрики: LIQUID-CRYSTAL
TEMPERATURE-DEPENDENCE
INTERFACE
ADSORPTION
Аннотация: The surface anchoring of a nematic doped with the ionic surfactant has been investigated and compared with the one in the undoped sample. The director tilt angle at the substrates coated with the orienting polymer film has been determined by the null method in a rotating magnetic field. The Frederiks transition in a magnetic field has been chosen as a convenient technique to measure the polar anchoring energy Wθ. The temperature dependences of anchoring energy have been obtained for the various nematic cells. The Wθ values for nematic doped with the ionic surfactant are less than for the undoped one. The factors affecting the measurement accuracy have been discussed. The accuracy is higher for the thinner nematic layers and weaker anchoring energy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak, Vladimir Yu., Prishchepa O. O., Gardymova, Anna P., Emelyanenko, Alexander V., Liu, Jui-Hsiang, Zyryanov V. Ya.
Заглавие : Orientational structures in cholesteric droplets with homeotropic surface anchoring
Коллективы : Russian Foundation for Basic Research Project [19-53-52011 MNT_a, RFMEFI62117X0011]
Место публикации : Soft Matter. - 2019. - Vol. 15, Is. 28. - P.5554-5561. - ISSN 1744-683X, DOI 10.1039/c9sm00384c. - ISSN 1744-6848(eISSN)
Примечания : Cited References: 67. - This work was supported by the Russian Foundation for Basic Research Project No. 19-53-52011 MNT_a. The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University supported by the project RFMEFI62117X0011.
Предметные рубрики: LIQUID-CRYSTAL DROPLETS
TOPOLOGICAL DEFECTS
NEMATIC DROPLETS
Аннотация: The dependency of orientational structures in cholesteric droplets with homeotropic surface anchoring on the helicity parameter has been studied by experiment and simulations. We have observed a sequence of structures, in which the director configurations and topological defects were identified by comparison of polarized microscopy pictures with simulated textures. A toron-like and low-symmetry intermediate layer-like structures have been revealed and studied in detail. The ranges of stability of the observed structures have been summarized in a general diagram and explained by the helicity parameter dependence of the free energy terms.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Bikbaev R. G., Sutormin V. S., Timofeev I. V., Zyryanov V. Ya.
Заглавие : Nematic and Cholesteric Liquid Crystal Structures in Cells with Tangential-Conical Boundary Conditions
Коллективы : Russian Science Foundation [18-72-10036]
Место публикации : Crystals. - 2019. - Vol. 9, Is. 5. - Ст.249. - ISSN 2073-4352, DOI 10.3390/cryst9050249
Примечания : Cited References: 43. - This work was supported by the Russian Science Foundation (No. 18-72-10036).
Предметные рубрики: TRANSITION
GRATINGS
Аннотация: Orientational structures formed in nematic and cholesteric layers with tangential-conical boundary conditions have been investigated. LC cells with one substrate specifying the conical surface anchoring and another substrate specifying the tangential one have been considered. The director configurations and topological defects have been identified analyzing the texture patterns obtained by polarizing microscope in comparison with the structures and optical textures calculated by free energy minimization procedure of director field and finite-difference time-domain method, respectively. The domains, periodic structures and two-dimensional defects proper to the LC cells with tangential-conical anchoring have been studied depending on the layer thickness and cholesteric pitch.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Prishchepa O. O., Shabanov A. V., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Polymer films with elongated droplets of nematic liquid crystal: light transmission, scattering, and polarization
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.H2-O-31
Примечания : Cited References: 3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M.
Заглавие : Structural stability of nematic liquid crystal droplets in the light of the catastrophe theory
Место публикации : Mod. Phys. Lett. B. - 2019. - Vol. 33, Is. 34. - Ст.1950434. - ISSN 0217-9849, DOI 10.1142/S0217984919504347. - ISSN 1793-6640 (eISSN)
Примечания : Cited References: 25. - The work was supported in part by the Siberian Branch of the Russian Academy of Sciences, integration Project No. 356-2018-0058.
Аннотация: Dynamical systems and defects in liquid crystals (LCs) are described using topological methods. Meanwhile, the director field distribution in LC droplets is affected by many bulk and surface factors that are difficult to take into account in the topological analysis. Therefore, the structural instability of a LC droplet formed in a magnetic field has been investigated by us in the framework of the catastrophe theory. The effect of temperature on the control parameters of the cusp catastrophe, which leads to the transition from a bipolar structure with extended poles to the homogeneous or radial configuration, has been estimated. It has been established from the potential curves that the transition is induced by the variation in the LC director orientation between the potential minima related to the LC polymer anchoring energy and magnetic field. The interplay of the cusp catastrophe control parameters and anchoring parameters has been elucidated.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudyak V. Yu., Krakhalev M. N., Sutormin V. S., Prischepa O. O., Zyryanov V. Ya., Emelyanenko A. V.
Заглавие : Orientation structures of nematic liquid crystal in ellipsoidal droplets
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.PB-17
Примечания : Cited References: 4
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