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Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal / K. -C. Huang [et al.] // Opt. Express. - 2016. - Vol. 24, Is. 22. - P. 25019-25025, DOI 10.1364/OE.24.025019. - Cited References: 22. - Ministry of Science and Technology (MOST), (103-2923-M-009-003-MY3); Ministry of Education and Science of the Russian Federation (3.1276.2014/K); Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (0358-2015-0010, 0358-2015-0011). . - ISSN 1094-4087
Кл.слова (ненормированные):
Defects -- Energy gap -- Liquid crystals -- Nematic liquid crystals -- Photonic crystals -- Spontaneous emission -- Homeotropic nematic liquid crystals -- Intensity modulators -- Low-power consumption -- Multi-channel filter -- One dimensional photonic crystal -- Photonic application -- Photonic bandgap devices -- Transmission characteristics -- Light transmission
Аннотация: We report on the spectral properties of an optically switchable tristable chiral-tilted homeotropic nematic liquid crystal (LC) incorporated as a tunable defect layer in one-dimensional photonic crystal. By varying the polarization angle of the incident light and modulating the light intensity ratio between UV and green light, various transmission characteristics of the composite were obtained. The hybrid structure realizes photo-tunability in transmission of defect-mode peaks within the photonic bandgap in addition to optical switchability among three distinct sets of defect modes via photoinduced tristable state transitions. Because the fabrication process is easier and less critical in terms of cell parameters or sample preparation conditions and the LC layer itself possesses an extra stable state compared with the previously reported bistable counterpart operating on the basis of biased-voltage dual-frequency switching, it has much superior potential for photonic applications such as a low-power-consumption multichannel filter and an optically controllable intensity modulator. © 2016 Optical Society of America.

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Держатели документа:
College of Photonics, National Chiao Tung University, Guiren Dist., Tainan, Taiwan
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Huang, K.-C.; Hsiao, Yu-Cheng; Yu-Cheng Hsiao; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.
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Untwisting of the helical structure of cholesteric droplets with homeotropic surface anchoring / M. N. Krakhalev [et al.] // JETP Letters. - 2017. - Vol. 105, Is. 1. - P. 51-54, DOI 10.1134/S002136401701012X. - Cited References:35. - This work was supported in part by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Region (project no. 16-42-240704r_a). The work of A.V.E on the theoretical analysis of the structure of liquid crystal droplets was supported by the Russian Science Foundation (project no. 16-43-03010). The work of Jui-Hsiang Liu was supported by the Ministry of Science and Technology of Taiwan (contract no. MOST105-2923-E-006-007). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTAL DROPLETS
   CYLINDRICAL CAVITIES
   TRANSITION
   KNOTS
Аннотация: Cholesteric droplets dispersed in a polymer with homeotropic surface anchoring are studied. A director configuration with the bipolar distribution of the axis of the helix is formed in droplets. The untwisting of the helical structure (i.e., an increase in the pitch of the helix) is experimentally observed at a decrease in the size of droplets. This dependence is analyzed for liquid crystal droplets with various concentrations of the chiral addition. A proposed empirical relation describes well the correlation of the helix pitch and the size of droplets in the studied samples.

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Публикация на русском языке Раскрутка спиральной структуры капель холестерика с гомеотропным поверхностным сцеплением [Текст] / М. Н. Крахалев [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2017. - Т. 105 Вып. 1-2. - С. 43-46

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.
Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Emel'yanenko, A. V.; Liu, Jui-Hsiang; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Foundation for Basic Research; Government of the Krasnoyarsk Region [16-42-240704r_a]; Russian Science Foundation [16-43-03010]; Ministry of Science and Technology of Taiwan [MOST105-2923-E-006-007]
}
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Transformation of cholesteric orientational structures and optical textures induced by the electric field–driven ionic modification of surface anchoring / V. S. Sutormin [et al.] // Bull. Russ. Acad. Sci. Phys. - 2017. - Vol. 81, Is. 5. - P. 602-604, DOI 10.3103/S1062873817050239. - Cited References: 8 . - ISSN 1062-8738
Кл.слова (ненормированные):
Cholesteric liquid crystals -- Liquid crystals -- Dc electric field -- Helical pitch -- Homeotropic alignment -- Ionic modification -- Liquid crystal cells -- Optical texture -- Orientational structure -- Surface-anchoring -- Electric fields
Аннотация: The reorientation of a cholesteric liquid crystal with a large helical pitch induced by the electric field–driven modification of surface anchoring is investigated. In the initial state, the liquid crystal cell has a homeotropic alignment of the director. An applied dc electric field produced a twisted homeoplanar structure of the cholesteric. © 2017, Allerton Press, Inc.

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Публикация на русском языке Трансформация ориентационных структур и оптических текстур холестерика, индуцированная электроуправляемой ионной модификацией поверхностного сцепления [Текст] / В. С. Сутормин [и др.] // Изв. РАН. Сер. физич. - 2017. - Т. 81 № 5. - С. 649-652

Держатели документа:
Kirensky Institute of Physics, Federal Research Center–Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sutormin, V. S.; Сутормин, Виталий Сергеевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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    Bipolar configuration with twisted loop defect in chiral nematic droplets under homeotropic surface anchoring / M. N. Krakhalev [et al.] // Sci. Rep. - 2017. - Vol. 7, Is. 1. - Ст. 14582, DOI 10.1038/s41598-017-15049-6. - Cited References: 45. - We are grateful to Dr. Timofeev Ivan Vladimirovich for valuable comments and discussions. This work was supported by the Russian Foundation for Basic Research (RFBR) under Grants Nos 15-02-06924, 16-53-00073, and Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 16-42-240704, and by the Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P 0358-2015-0010. The work of V.Y.R. and À.V.Å. on the simulation of droplet structure and texture was supported by the Russian Science Foundation (project No. 16-43-03010). The work of J.H.L. was supported by the Ministry of Science and Technology of Taiwan (contract No. MOST105-2923-E-006-007). . - ISSN 2045-2322
   Перевод заглавия: Биполярная конфигурация с дефектом в виде закрученной петли в нематических каплях при гомеотропном поверхностном сцеплении
Аннотация: Optical textures and appropriate orientational structures have been studied within droplets of chiral nematic dispersed in polymer assigning the homeotropic anchoring. The helix axis of the chiral structure inside droplets forms the bipolar configuration. The optical droplet textures were analysed in the unpolarised light, analyser switching-off scheme and in crossed polarisers. The twisted loop defect reveals itself convincingly in all schemes. Its appearance at the optical patterns of the chiral nematic droplets has been examined depending on their size and the aspect direction. The existence of the defect has been verified by the structural and optical calculations. The effect of an electric field on both the defect line shape and the orientational structure of chiral nematic has been studied.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center - Krasnoyarsk Scientific Center, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Faculty of Physics, Lomonosov Moscow State University, Moscow, Russian Federation
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Rudyak, V. Yu.; Emelyanenko, A. V.; Liu, J. -H.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring / M. N. Krakhalev [et al.] // Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст. 1-Е-6. - Cited References: 5

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Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Gardymova, A. P.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Emelyanenko, A. V.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; International Liquid Crystal Conference(27 ; 2018 ; July ; 22-27 ; Kyoto, Japan)
}
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    Anionic-cationic surfactant mixture providing the electrically controlled homeotropic surface anchoring of liquid crystals / M. N. Krakhalev [et al.] // J. Mol. Liq. - 2019. - Vol. 282: Suzdal Conference (2018, Suzdal, RUSSIA). - P. 57-62, DOI 10.1016/j.molliq.2019.02.132. - Cited References: 30. - The reported study was supported by the Belarusian Republican Foundation for Fundamental Research (project No X16P-110) and Russian Foundation for Basic Research (RFBR) (project No 16-53-00073). Mikhail N. Krakhalev and Vitaly S. Sutormin acknowledge financial support from RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (project No 18-42-243006). . - ISSN 0167-7322. - ISSN 1873-3166
   Перевод заглавия: Смесь анионного и катионного сурфактантов, обеспечивающая электроуправляемое гомеотропное поверхностное сцепление в жидких кристаллах

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
IONIC MODIFICATION
   TRANSITION
   DROPLETS
   CONFIGURATION
   LAYER
Кл.слова (ненормированные):
Polymer dispersed liquid crystal -- Nematic droplet -- Ionic surfactant -- Anchoring transition -- Director configuration -- Optical texture
Аннотация: In search of a substance able to function as an anionic surfactant applied for the electrically-induced anchoring transitions in liquid crystals, the compound 4-heptyloxybenzoate benzyl dodecyldimethylammonium (HOBBDDA) has been synthesized. Its orienting influence on nematic liquid crystal 4-pentyl-4'-cyanobiphenyl (5CB) has been tested. HOBBDDA dissolved up to 1.4%in 50 droplets dispersed in polymer film does not change the tangential surface anchoring inherent to polyvinyl alcohol matrix used. Homeotropic surface anchoring is realized if the HOBBDDA content exceeds 1.7%. The molecules of the surfactant in 5CB dissociate into anions and cations. The anions modify the surface anchoring under the action of DC electric field both in the normal and inverse mode. The mixture of HOBBDDA and cetyltrimethylammonium bromide can function as a binary ionic cationic surfactant which significantly expands the prospects for using the ionic-surfactant method to control liquid crystal materials. (C) 2019 Elsevier B.V. All rights reserved.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Belarusian State Technol Univ, Minsk 220006, BELARUS.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Kuz'menok, N. M.; Mikhalyonok, S. G.; Bezborodov, V. S.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Belarusian Republican Foundation for Fundamental Research [X16P-110]; Russian Foundation for Basic Research (RFBR) [16-53-00073]; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-243006]; International conference on Hole Burning, Single Molecule, and Related Spectroscopies: Science and Applications - 2018(XIII ; August 6-12, 2018 ; Suzdal - Moscow, Russia)
}
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Photo-orientation of nematic liquid crystal without preliminary cell surface treatment / S. A. Shvetsov [et al.] // Opt. Mater. Express. - 2019. - Vol. 9, Is. 6. - P. 2595-2600, DOI 10.1364/OME.9.002595. - Cited References: 28. - Russian Science Foundation (RSF) (18-72-00242). . - ISSN 2159-3930

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
HOMEOTROPIC ALIGNMENT
   INTERFACE
   DYE
   PHOTOALIGNMENT
   NONLINEARITY
Аннотация: We propose a simple and effective method of liquid crystal photoalignment that does not require any preliminary treatment of the cell substrates. To this aim, a small amount (0.1 wt %) of azobenzene carboxylic acid is added into the nematic liquid crystal. After filling the liquid crystal cell, a part of the dopant molecules is spontaneously adsorbed and attached to the glass surface by hydrogen bonds. This allows one to switch the boundary conditions of liquid crystal between homeotropic and planar due to the reversible trans-cis photoizomerization. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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Держатели документа:
Lomonosov Moscow State Univ, Moscow 119991, Russia.
Lebedev Phys Inst, Moscow 119991, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Siberian Branch, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Shvetsov, S. A.; Emelyanenko, Alexander, V; Bugakov, M. A.; Boiko, N. I.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation (RSF) [18-72-00242]
}
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    Toroidal Configuration of a Cholesteric Liquid Crystal in Droplets with Homeotropic Anchoring / M. N. Krakhalev [et al.] // JETP Letters. - 2019. - Vol. 109, Is. 7. - P. 478-481, DOI 10.1134/S0021364019070075. - Cited References: 30. - This work was supported by the Russian Science Foundation (project no. 18-72-10036). The work was performed using the equipment of the Shared Usage Center of High-Capacity Computational Resources, Moscow State University, supported by the Ministry of Education and Science of the Russian Federation (project no. RFMEFI62117X0011). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
NEMATIC DROPLETS
   SURFACE
Аннотация: Orientational structures formed in cholesteric droplets with homeotropic surface anchoring have been studied by means of polarization optical microscopy and computer simulations. It has been found that, when the ratio of the size of droplets to the pitch of a cholesteric helix ranges from 1.4 to 2.9, an axisymmetric toroidal cholesteric structure is formed with a topological linear defect in the form of an equatorially located surface ring. The features of the toroidal structure in cholesteric droplets and their optical textures for various observation schemes are examined in detail.

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Публикация на русском языке Тороидальная конфигурация холестерика в каплях с гомеотропным сцеплением [Текст] / М. Н. Крахалев [и др.] // Письма в ЖЭТФ. - 2019. - Т. 109 Вып. 7-8. - С. 487-491

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Gardymova, A. P.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation [18-72-10036]; Ministry of Education and Science of the Russian Federation [RFMEFI62117X0011]
}
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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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10.

Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring / V. Yu. Rudyak [et al.] // 15th Eur. Conf. Liq. Cryst. (ECLC) : conf. progr. - 2019. - Ст. PB-31. - Cited References: 4

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Доп.точки доступа:
Rudyak, V. Yu.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Emelyanenko, A. V.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; European Conference on Liquid Crystals(15 ; 2019 ; June 30 - July 5 ; Wroclaw, Poland)
}
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11.

Homeotropic to planar realignment of nematicliquid crystal cell induced by self-assembled photosensitive layer / S. A. Shvetsov [et al.] // 15th Eur. Conf. Liq. Cryst. (ECLC) : conf. progr. - 2019. - Ст. PC-35. - Cited References: 4

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Доп.точки доступа:
Shvetsov, S. A.; Emelyanenko, A. V.; Bugakov, M. A.; Boiko, N. I.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; European Conference on Liquid Crystals(15 ; 2019 ; June 30 - July 5 ; Wroclaw, Poland)
}
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12.

    Magnetic-field tunable defect modes in a photonic-crystal/liquid-crystal cell / V. Ya. Zyryanov [et al.] // Opt. Express. - 2010. - Vol. 18, Is. 2. - P. 1283-1288, DOI 10.1364/OE.18.001283. - Cited Reference Count: 15. - Гранты: This work was partially supported by the Russian Federal Grant No. 02.740.11.0220 and SB RAS Grant Nos. 5, 27.1 and 144. W. Lee gratefully acknowledges financial support from the National Science Council of the Republic of China (Taiwan) under Grant No. NSC 98-2923-M-033-001-MY3 dedicated to an internationally joint effort between Russia and Taiwan. - Финансирующая организация: Russian Federal [02.740.11.0220]; SB RAS [5, 27.1, 144]; National Science Council of the Republic of China (Taiwan) [NSC 98-2923-M-033-001-MY3] . - JAN 18. - ISSN 1094-4087
Рубрики:
NEMATIC LIQUID-CRYSTAL
   BAND-GAP MATERIALS
   SPONTANEOUS EMISSION
   SPECTRUM
Кл.слова (ненормированные):
Crystal defects -- Magnetic fields -- Photonic crystals -- Applied magnetic fields -- Crossed polarizers -- Crystal cells -- Defect mode -- Homeotropic -- Light transmission spectra -- Light wave -- Nematic director -- Optical cells -- Planar alignment -- Spectral shift -- Tunable defect -- Light transmission -- article -- artifact -- chemistry -- electromagnetic field -- liquid crystal -- materials -- materials testing -- radiation exposure -- refractometry -- Artifacts -- Electromagnetic Fields -- Liquid Crystals -- Manufactured Materials -- Materials Testing -- Refractometry
Аннотация: Light transmission spectrum of a multilayer photonic crystal with a central liquid-crystal defect layer placed between crossed polarizers has been studied. Transmittance was varied due to the magnetically induced reorientation of the nematic director from homeotropic to planar alignment. Two notable effects were observed for this scheme: the spectral shift of defect modes corresponding to the extraordinary light wave and its superposition with the ordinary one. As a result, the optical cell allows controlling the intensity of interfering defect modes by applied magnetic field. (C) 2010 Optical Society of America

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660014, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Chung Yuan Christian Univ, Dept Phys, Chungli 32023, Taiwan
Chung Yuan Christian Univ, Ctr Nanotechnol, Chungli 32023, Taiwan

Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Parshin, A. M.; Паршин, Александр Михайлович; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Lee, Wei
}
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13.

Polymer-dispersed cholesteric liquid crystal under homeotropic anchoring: Electrically induced structures with λ1/2-disclination / A. P. Gardymova, M. N. Krakhalev, V. Yu. Rudyak [et al.] // Polymers. - 2022. - Vol. 14, Is. 7. - Ст. 1454, DOI 10.3390/polym14071454. - Cited References: 44. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038 . - ISSN 2073-4360
Кл.слова (ненормированные):
polymer-dispersed cholesteric liquid crystal -- orientational structure -- electric field-induced transformation -- topological defect -- metastable state
Аннотация: Orientational structures of polymer-dispersed cholesteric liquid crystal under homeotropic anchoring and their transformations under the action of an electric field are studied. The switching of cholesteric droplets between different topological states are experimentally and theoretically demonstrated. Structures with λ+1/2-disclination are found and considered. These structures are formed during the transformation of a twisted toroidal configuration induced by a decrease in the electric field when a relative chiral parameter N0>6.3. The transformation of the initial structure with a bipolar distribution of the helix axis into a twisted toroidal configuration and then into a structure with λ+1/2-disclination is investigated in detail. The behavior of these structures under the influence of an external electric field, as well as the appearance of structures with λ−1/2-disclination, are studied. Obtained results are promising for the development of optical materials with programmable properties.

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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
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russian Federation
Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Gardymova, A. P.; Гардымова, Анна Петровна; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Рудяк, В. Ю.; Barbashov, V. A.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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14.

Inverse mode of ion-surfactant method of director reorientation inside nematic droplets / M. N. Krakhalev, O. O. Prishchepa, V. Y. Zyryanov // Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P. 1998-2003, DOI 10.1080/15421400903050814. - Cited Reference Count: 8. - Гранты: This work was partially supported by the grants Nos. NSh-3818.2008.3; 02.740.11.0220, and No. 08-03-01007 of RFBR, and Nos. 27.1; 110; 144 of SB RAS. M. Krakhalev acknowledges the financial support from K. I. Zamaraev MBN Foundation. O. Prishchepa acknowledges the financial support from Russian Science Support Foundation. - Финансирующая организация: RFBR [NSh-3818.2008.3, 02.740.11.0220, 08-03-01007]; SB RAS [27.1; 110; 144]; Zamaraev MBN Foundation; Russian Science Support Foundation . - ISSN 1542-1406
Кл.слова (ненормированные):
electrically commanded surfaces -- ion surfactant -- nematic -- polymer dispersed liquid crystals -- surface anchoring -- Electrically commanded surfaces -- Ion surfactant -- Nematic -- Polymer dispersed liquid crystals -- Surface anchoring -- Applied voltages -- Crossed polarizers -- Director fields -- Director reorientation -- Droplet structure -- Electrically commanded surfaces -- High concentration -- Homeotropic -- Initial state -- Ionic modification -- Liquid-crystal droplets -- Nematic droplets -- Nematic polymer -- Surface-active cations -- Surface-anchoring -- Trimethyl -- Ammonium compounds -- Cationic surfactants -- Crystals -- Drop formation -- Dyes -- Ionization of liquids -- Ions -- Liquid crystal displays -- Liquid crystals -- Liquids -- Nematic liquid crystals
Аннотация: Inverse mode of a novel electrooptical effect caused by the ionic modification of boundary conditions has been studied for liquid crystal droplets. We have considered the droplets of nematic 5CB doped with cationic surfactant cetyl-trimethyl-ammonium-bromide and dispersed in polyvinyl alcohol. In the initial state the surface anchoring was normal on the whole interface due to the high concentration of homeotropic surfactant. Applied voltage results in the purification of a section of the interface from the surface-active cations thereby restoring here a tangential anchoring and stimulating the significant transformation of droplet structure. At that three different types of director field distribution can be realized within the same droplet. The proper textures of the droplet both in the crossed polarizers and without analyzer are considered.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia
Siberian Fed Univ, Krasnoyarsk, Russia

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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15.

    Ориентационный переход в слое нематика с гомеотропно-коническими граничными условиями, индуцированный ионной модификацией поверхностного сцепления / В. С. Сутормин, М. Н. Крахалев, О. О. Прищепа, В. Я. Зырянов // Жидк. крист. и их практич. использ. - 2022. - Т. 22, № 3. - С. 105-110 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2022.3.105. - Библиогр.: 4. - В.С. Сутормин, М.Н. Крахалев и О.О. Прищепа благодарят за поддержку грант РФФИ, Правительства Красноярского края и Красноярского краевого фонда науки в рамках научного проекта № 20-42-240007 . - ISSN 1991-3966. - ISSN 2499-9644
   Перевод заглавия: Orientational transition in nematic layer with homeotropic-conical boundary conditions induced by ionic modification of surface anchoring
Кл.слова (ненормированные):
нематик -- ионный сурфактант -- поверхностное сцепление -- конические граничные условия -- конфигурация директора -- оптическая текстура -- nematic -- ionic surfactant -- surface anchoring -- conical boundary conditions -- director configuration -- optical texture
Аннотация: Исследована трансформация ориентационной структуры в слое нематика с гомеотропно-коническими граничными условиями, индуцированная электроуправляемой ионной модификацией поверхностного сцепления. Обнаружено, что изменение азимутального угла директора на подложке с коническим сцеплением возможно осуществить путем модификации граничных условий на второй подложке.
The transformation of the orientational structure induced by the electrically controlled ionic modification of surface anchoring in the nematic layer with homeotropic-conical boundary conditions has been considered. It has been found that the change in the azimuthal angle of director at the substrate with conical anchoring can be realized by modification of boundary conditions at the second substrate.

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Держатели документа:
Институт физики им. Л. В. Киренского, ФИЦ КНЦ СО РАН, Красноярск, Россия
Институт инженерной физики и радиоэлектроники, Сибирский федеральный университет, Красноярск, Россия

Доп.точки доступа:
Сутормин, Виталий Сергеевич; Sutormin, V. S.; Крахалев, Михаил Николаевич; Krakhalev, M. N.; Прищепа, Оксана Олеговна; Prishchepa, O. O.; Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.

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16.

    Optical textures and orientational structures of nematic and cholesteric droplets with heterogeneous boundary conditions / O. O. Prishchepa [et al.] // Mol. Cryst. Liquid Cryst. - 2008. - Vol. 489, Is. 1. - P. 84-93, DOI 10.1080/15421400802219817. - Cited Reference Count: 17. - Гранты: This work was supported in part by the grants of DSP, No 2.1.1.1814; RFBR, No 0803-01007; Council of the President of the RF for Support of Young Scientists and Leading Scientific Schools (projects NSh-3818-2008.3, MK-3624.2007.2); RAS, No 8.1, 2.10.2; SB RAS, No 33. - Финансирующая организация: DSP [2.1.1.1814]; RFBR [0803-01007]; Young Scientists and Leading Scientific Schools [NSh-3818-2008.3, MK-3624.2007.2]; RAS [8.1, 2.10.2]; SB RAS [33] . - ISSN 1542-1406
Рубрики:
LIQUID-CRYSTAL DROPLETS
   ELECTRIC-FIELD
   BIPOLAR
Кл.слова (ненормированные):
director configuration -- interfaces -- nematic and cholesteric droplets -- surfactant -- Director configuration -- Interfaces -- Nematic and cholesteric droplets -- Surfactant -- Boundary value problems -- Drop formation -- Drops -- Fluid mechanics -- Phospholipids -- Surface active agents -- Boundary conditioning -- Director configuration -- Homeotropic -- Interfaces -- Nematic and cholesteric droplets -- Nematic droplets -- Nematics -- Optical textures -- Orientational structures -- Surface anchoring -- Surfactant -- Boundary conditions
Аннотация: Brief review of the orientational structures within the droplets of chiral as well as achiral nematics with the heterogeneous boundary conditions is reported. The modification of boundary conditions in the 5CB/polyvinylbutyral and LN-396/cholesterylacetate/polyvinylbutyral compositions with the planar anchoring at the interface is created by addition of the homeotropic surfactant (lecithin). Sequences of the novel stable and non-stable orientational structures being realized within the droplets of achiral nematic are presented. For the LN-396 nematic droplets doped by cholesterylacetate the formation of a spherulite structure has been shown when the tangential surface anchoring is modified to the homeotropic one.

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Держатели документа:
Siberian Fed Univ Krasnoyarsk, Krasnoyarsk Sci Ctr, SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
L.V. Kirensky Institut of physics

Доп.точки доступа:
Prishchepa, O. O.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Gardymova, A. P.; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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17.

Electrically induced transformation of cholesteric droplets under homeotropic boundary conditions / M. N. Krakhalev, A. P. Gardymova, V. Yu. Rudyak [et al.] // J. Mol. Liq. - 2023. - Vol. 385. - Ст. 122379, DOI 10.1016/j.molliq.2023.122379. - Cited References: 37. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038. The research was carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University . - ISSN 0167-7322. - ISSN 1873-3166
Кл.слова (ненормированные):
Cholesteric droplet -- Orientational structure -- Topological defect -- Electric field -- Structure relaxation
Аннотация: Cholesteric droplets under homeotropic boundary conditions demonstrate a rich variety of possible orientational structures. We have implemented electrically controlled switching of such droplets between two classes of stable states: i) structures with cylindrical cholesteric layers and ii) layer-like structures with one or more λ+1/2-disclinations. Structure relaxation after switching off the voltage proceeded via the fast (less than 1 s), the slow (more than 1 s), and the stabilization stages (~10 hours). We investigated intermediate long-lived metastable states occurring in the relaxation process and explained the formation of various structures in cholesteric droplets. The fast and the slow stages of relaxation were found to be sensitive to the voltage reduction regime. We have determined the combinations of droplet size and voltage reduction regimes leading to the two types of structures after relaxation.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38 Akademgorodok, Krasnoyarsk, 330036, Krasnoyarsk region, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, 79 Svobodny Pr., Krasnoyarsk, 660041, Krasnoyarsk region, Russia
Faculty of Physics, Moscow State University, 1/2 Leninskiye Gory, Moscow, 119991, Moscow, Russia
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninsky Pr., Moscow, 119991, Moscow, Russia

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Гардымова, Анна Петровна; Rudyak, Vladimir Yu.; Barbashov, Vadim A.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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