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Optical modes of multilayered photonic structure containing nematic layer with abnormal electroconvective rolls / V. A. Gunyakov, M. N. Krakhalev, I. V. Timofeev [et al.] // Opt. Mater. - 2020. - Vol. 100. - Ст. 109630, DOI 10.1016/j.optmat.2019.109630. - Cited References: 30. - We are grateful to M.N. Volochaev for providing TEM micrograph of the mirror . - ISSN 0925-3467
Кл.слова (ненормированные):
Nematic liquid crystal -- Optical modes -- Nematic liquid crystal -- Electroconvective instability -- Cross-polarization diffraction -- Geometric phase
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович
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Optical modes of multilayered photonic structure containing nematic layer with abnormal electroconvective rolls / V. A. Gunyakov [et al.]. - Electronic text data // ArXiv. - 2019. - Ст. 1912.00368. - Cited References: 30. - We are grateful to M.N. Volochaev for providing TEM micrograph of the mirror.

РУБ Optical Materials
Рубрики:
Optics
Кл.слова (ненормированные):
Photonic structure -- Optical modes -- Nematic liquid crystal -- Electroconvective instability -- Cross-polarization diffraction -- Geometric phase
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russia

Доп.точки доступа:
Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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    Синтез органилтрифенилфосфоний галогенидов, четвертичных аммонийных солей и исследование их применения в качестве сурфактантов, растворимых в жидких кристаллах / Н. М. Кузьменок, С. Г. Михалёнок, А. С. Орёл [и др.] // Жидк. кристаллы и их практич. использ. - 2020. - Т. 20, № 1. - С. 6-18 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2020.1.6. - Библиогр.: 18. - Работа выполнена частично при финансировании по проекту междисциплинарных интеграционных исследований СО РАН. . - ISSN 1991-3966
   Перевод заглавия: Synthesis of organotriphenylphosphonium halides, quaternary ammonium salts and study of their application as surfactants soluble in liquid crystals
Кл.слова (ненормированные):
жидкий кристалл -- нематик -- сурфактант -- четвертичная аммонийная соль -- органилтрифенилфосфоний галогенид -- ионно-сурфактантный метод -- liquid crystal -- nematic -- surfactant -- quaternary ammonium salt -- organotriphenylphosphonium halides -- onic-surfactant method
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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Держатели документа:
Белорусский государственный технологический университет
Институт физики им. Л. В. Киренского Сибирского отделения РАН
Сибирский федеральный университет
Институт теоретической и прикладной механики им. С. А. Христиановича СО РАН

Доп.точки доступа:
Кузьменок, Н. М.; Kuz'menok N. M.; Михалёнок, С. Г.; Mikhalyonok S. G.; Орёл, А. С.; Arol A. S.; Shevchuk, M. O.; Bezborodov, V. S.; Крахалев, Михаил Николаевич; Krakhalev, M. N.; Сутормин, Виталий Сергеевич; Sutormin, V. S.; Прищепа, Оксана Олеговна; Prishchepa, O. O.; Жаркова, Г. М.; Zharkova G. M.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Zyryanov, Victor Yakovlevich; Krakhalev, Mikhail

}
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Small-angle scattering and radiation polarization by a stretched polymer film with nematic liquid crystal droplets having a single-domain structure / V. A. Loiko, A. V. Konkolovich, A. A. Miskevich [et al.] // Opt. Spectrosc. - 2020. - Vol. 128, Is. 3. - P. 331-338, DOI 10.1134/S0030400X20030121. - 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). . - ISSN 0030-400X. - ISSN 1562-6911

РУБ Optics + Spectroscopy
Рубрики:
IONIC MODIFICATION
LIGHT
Кл.слова (ненормированные):
light scattering -- radiation polarization -- liquid crystal
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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Публикация на русском языке Малоугловое рассеяние и поляризация излучения вытянутой полимерной пленкой с каплями нематического жидкого кристалла, имеющими монодоменную структуру [Текст] / В. А. Лойко, А. В. Конколович, А. А. Мискевич, М. Н. Крахалев // Оптика и спектроскопия. - 2020. - Т. 128 Вып. 3. - С. 343-350

Держатели документа:
Natl Acad Sci Belarus, Stepanov Inst Phys, Minsk 220072, BELARUS.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Loiko, V. A.; Konkolovich, A. V.; Miskevich, A. A.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; 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]
}
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    Polar anchoring energy and tilt angle measured by magneto-optical technique in nematic doped with ionic surfactant / A. M. Parshin, V. S. Sutormin, V. Y. Zyryanov, V. F. Shabanov // Liq. Cryst. - 2020. - Vol. 47, Is. 12. - P. 1825-1831, DOI 10.1080/02678292.2020.1733683. - Cited References: 32 . - ISSN 0267-8292. - ISSN 1366-5855
   Перевод заглавия: Полярная энергия сцепления и угол наклона измеренные магнитооптической методикой в нематике допированном ионным сурфактантом

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
LIQUID-CRYSTAL
   TEMPERATURE-DEPENDENCE
   INTERFACE
   ADSORPTION
Кл.слова (ненормированные):
Nematic -- ionic surfactant -- tilt angle -- anchoring energy -- magnetooptics
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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Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr,Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Parshin, A. M.; Паршин, Александр Михайлович; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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    Orientational structures in cholesteric droplets with homeotropic surface anchoring / M. N. Krakhalev [et al.] // Soft Matter. - 2019. - Vol. 15, Is. 28. - P. 5554-5561, DOI 10.1039/c9sm00384c. - 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. . - ISSN 1744-683X. - ISSN 1744-6848
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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Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Lomonosov Moscow State Univ, Fac Phys, Moscow 119991, Russia.
Natl Cheng Kung Univ, Tainan 70101, Taiwan.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, Vladimir Yu.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Gardymova, Anna P.; Emelyanenko, Alexander V.; Liu, Jui-Hsiang; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Foundation for Basic Research Project [19-53-52011 MNT_a, RFMEFI62117X0011]
}
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    Nematic and Cholesteric Liquid Crystal Structures in Cells with Tangential-Conical Boundary Conditions / M. N. Krakhalev [et al.] // Crystals. - 2019. - Vol. 9, Is. 5. - Ст. 249, DOI 10.3390/cryst9050249. - Cited References: 43. - This work was supported by the Russian Science Foundation (No. 18-72-10036). . - ISSN 2073-4352
   Перевод заглавия: Структуры нематика и холестерика в ячейках с тангенциально-коническими граничными условиями

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
TRANSITION
GRATINGS
Кл.слова (ненормированные):
liquid crystal -- cholesteric -- nematic -- conical boundary conditions -- orientational structure -- director configuration -- topological defect
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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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation [18-72-10036]
}
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Polymer films with elongated droplets of nematic liquid crystal: light transmission, scattering, and polarization / V. A. Loiko [et al.] // 15th Eur. Conf. Liq. Cryst. (ECLC) : conf. progr. - 2019. - Ст. H2-O-31. - Cited References: 3

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Доп.точки доступа:
Loiko, V. A.; Konkolovich, A. V.; Miskevich, A. A.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; European Conference on Liquid Crystals(15 ; 2019 ; June 30 - July 5 ; Wroclaw, Poland)
}
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    Parshin, A. M.
    Structural stability of nematic liquid crystal droplets in the light of the catastrophe theory / A. M. Parshin // Mod. Phys. Lett. B. - 2019. - Vol. 33, Is. 34. - Ст. 1950434, DOI 10.1142/S0217984919504347. - 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. . - ISSN 0217-9849. - ISSN 1793-6640
   Перевод заглавия: Структурная устойчивость нематических жидкокристаллических капель в свете теории катастроф
Кл.слова (ненормированные):
Liquid crystal droplet -- polymer -- anchoring energy -- cups catastrophe -- control parameters -- structural transition
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036 Russia
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041 Russia

Доп.точки доступа:
Паршин, Александр Михайлович
}
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10.

Orientation structures of nematic liquid crystal in ellipsoidal droplets / O. O. Prishchepa [et al.] // 15th Eur. Conf. Liq. Cryst. (ECLC) : conf. progr. - 2019. - Ст. PB-17. - Cited References: 4

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Доп.точки доступа:
Rudyak, V. Yu.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Prischepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Emelyanenko, A. V.; European Conference on Liquid Crystals(15 ; 2019 ; June 30 - July 5 ; Wroclaw, Poland)
}
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