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Каталог книг и брошюр библиотеки ИФ СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Huang K.-C., Hsiao Yu-Cheng, Timofeev I. V., Zyryanov V. Ya., Lee W.
Заглавие : Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal
Место публикации : Opt. Express: Optical Society of America, 2016. - Vol. 24, Is. 22. - P.25019-25025. - ISSN 10944087 (ISSN), DOI 10.1364/OE.24.025019
Примечания : 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).
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Gardymova A. P., Emel'yanenko A. V., Liu, Jui-Hsiang, Zyryanov V. Ya.
Заглавие : Untwisting of the helical structure of cholesteric droplets with homeotropic surface anchoring
Коллективы : 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]
Место публикации : JETP Letters. - 2017. - Vol. 105, Is. 1. - P.51-54. - ISSN 0021-3640, DOI 10.1134/S002136401701012X. - ISSN 1090-6487(eISSN)
Примечания : 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).
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Timofeev I. V., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Transformation of cholesteric orientational structures and optical textures induced by the electric field–driven ionic modification of surface anchoring
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2017. - Vol. 81, Is. 5. - P.602-604. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873817050239
Примечания : Cited References: 8
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Gardymova A. P., Prishchepa O. O., Rudyak V. Yu., Emelyanenko A. V., Liu J. -H., Zyryanov V. Ya.
Заглавие : Bipolar configuration with twisted loop defect in chiral nematic droplets under homeotropic surface anchoring
Место публикации : Sci. Rep. - 2017. - Vol. 7, Is. 1. - Ст.14582. - ISSN 20452322 (ISSN), DOI 10.1038/s41598-017-15049-6
Примечания : 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).
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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak V. Yu., Gardymova A. P., Prishchepa O. O., Emelyanenko A. V., Zyryanov V. Ya.
Заглавие : Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.1-Е-6
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Sutormin V. S., Prishchepa O. O., Kuz'menok N. M., Mikhalyonok S. G., Bezborodov V. S., Zyryanov V. Ya.
Заглавие : Anionic-cationic surfactant mixture providing the electrically controlled homeotropic surface anchoring of liquid crystals
Коллективы : International conference on Hole Burning, Single Molecule, and Related Spectroscopies: Science and Applications - 2018 , 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]
Место публикации : J. Mol. Liq. - 2019. - Vol. 282: Suzdal Conference (2018, Suzdal, RUSSIA). - P.57-62. - ISSN 0167-7322, DOI 10.1016/j.molliq.2019.02.132. - ISSN 1873-3166(eISSN)
Примечания : 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).
Предметные рубрики: IONIC MODIFICATION
TRANSITION
DROPLETS
CONFIGURATION
LAYER
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shvetsov S. A., Emelyanenko, Alexander, V, Bugakov M. A., Boiko N. I., Zyryanov V. Ya.
Заглавие : Photo-orientation of nematic liquid crystal without preliminary cell surface treatment
Коллективы : Russian Science Foundation (RSF) [18-72-00242]
Место публикации : Opt. Mater. Express. - 2019. - Vol. 9, Is. 6. - P.2595-2600. - ISSN 2159-3930, DOI 10.1364/OME.9.002595
Примечания : Cited References: 28. - Russian Science Foundation (RSF) (18-72-00242).
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak, V. Yu., Gardymova A. P., Zyryanov V. Ya.
Заглавие : Toroidal Configuration of a Cholesteric Liquid Crystal in Droplets with Homeotropic Anchoring
Коллективы : Russian Science Foundation [18-72-10036]; Ministry of Education and Science of the Russian Federation [RFMEFI62117X0011]
Место публикации : JETP Letters. - 2019. - Vol. 109, Is. 7. - P.478-481. - ISSN 0021-3640, DOI 10.1134/S0021364019070075. - ISSN 1090-6487(eISSN)
Примечания : 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).
Предметные 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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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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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudyak V. Yu., Krakhalev M. N., Gardymova A. P., Prishchepa O. O., Emelyanenko A. V., Zyryanov V. Ya.
Заглавие : Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.PB-31
Примечания : Cited References: 4
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