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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) : Gunyakov V. A., Timofeev I. V., Krakhalev M. N., Lee W., Zyryanov V. Ya.
Заглавие : Electric field-controlled transformation of the eigenmodes in a twisted-nematic Fabry-Perot cavity
Коллективы : Ministry of Science and Technology, Taiwan [106-2923-M-009-002-MY3]
Место публикации : Sci. Rep. - 2018. - Vol. 8. - Ст.16869. - ISSN 2045-2322, DOI 10.1038/s41598-018-35095-y
Примечания : Cited References: 33. - The work of W.L. was supported by the Ministry of Science and Technology, Taiwan, through Grant No. 106-2923-M-009-002-MY3.
Предметные рубрики: DIMENSIONAL PHOTONIC CRYSTAL
TUNABLE OPTICAL FILTER
LIQUID-CRYSTAL
Аннотация: The polarized optical states in the transmission spectrum of a twisted-nematic Fabry-Perot cavity with the distinctly broken Mauguin's waveguide regime have been theoretically and experimentally investigated. Specific features of the electric field-induced transformation of the polarization and spectral characteristics of eigenmodes of the neighboring series at the overlap resonant frequencies have been examined. It is demonstrated that the linear polarizations of eigenmodes at the cavity boundaries remain nearly orthogonal and their frequency trajectories reproduce the avoided crossing phenomenon. The experimental data are confirmed analytically and by the numerical simulation of light transmission through the investigated anisotropic multilayer with the use of a Berreman matrix method. The results obtained can be generalized to any materials with the helix response.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Timofeev I. V., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Polarization exchange of optical eigenmode pair in twisted-nematic Fabry-Perot resonator
Коллективы : Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P [0356-2015-0410, 0356-2015-0411]; RFBR [17-42-240464]
Место публикации : Phys. Rev. E: American Physical Society, 2017. - Vol. 96, Is. 2. - Ст.022711. - ISSN 2470-0045, DOI 10.1103/PhysRevE.96.022711. - ISSN 2470-0053(eISSN)
Примечания : Cited References:30. - This work was partially supported by the Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (Projects No. 0356-2015-0410 and No. 0356-2015-0411). I.V.T. acknowledges the support by RFBR 17-42-240464.
Предметные рубрики: LIQUID-CRYSTAL
REFRACTIVE-INDEX
FORMULATION
FILTER
CELL
Аннотация: The polarization exchange effect in a twisted-nematic Fabry-Perot resonator is experimentally confirmed in the regimes of both uniform and electric-field-deformed twisted structures. The polarization of output light in the transmission peaks is shown to be linear rather than elliptical. The polarization deflection from the nematic director grows from 0 degrees to 90 degrees. angle and exchanges the longitudinal and transverse directions. Untwisting of a nematic by a voltage leads to the rotation of the polarization plane of light passing through the resonator. The polarization exchange effect allows using the investigated resonator as a spectral-selective linear polarizer with the voltage-controlled rotation of the polarization plane.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович
Заглавие : Отклик гибридно-упорядоченного нематика с поверхностной линией дисклинации на импульс магнитного поля
Место публикации : Жидк. кристаллы и их практич. использ. - 2021. - Т. 21, № 3. - С. 60-67. - ISSN 1991-3966 (ISSN), DOI 10.18083/LCAppl.2021.3.60; Liq. Cryst. Appl. - ISSN 2499-9644 (eISSN)
Примечания : Библиогр.: 23
Предметные рубрики: LIQUID-CRYSTAL
DOMAIN-STRUCTURE
INTERFERENCE
DYNAMICS
BEHAVIOR
FILM
Аннотация: Исследовано оптическое пропускание гибридно-упорядоченного нематического слоя с поверхностной линией дисклинации, деформированного импульсным магнитным полем. Получены выражения для времен реакции на полевое воздействие и релаксации жидкого кристалла к недеформированному состоянию. Время реакции оказалось существенно больше расчетного значения и сопоставимым с длительностью импульса магнитного поля. Выведены зависимости интенсивности света от разности фаз между обыкновенным и необыкновенным лучами с учетом рассеяния. Для процесса релаксации получено хорошее совпадение экспериментальной и расчетной временных зависимостей интенсивности лазерного излучения, прошедшего через весь слой жидкого кристалла, за исключением тонкого переходного приповерхностного слоя. Аномалия хода кривой релаксации в переходном слое рассмотрена в рамках известных модельных представлений.The optical transmission of a hybrid-ordered nematic layer with a surface disclination line, strained by a pulsed magnetic field, is studied. The expressions for the reaction times to the field action and relaxation of a liquid crystal to an untrained state are obtained. The experimental reaction time turned out to be significantly longer than its calculated value and comparable to the magnetic field pulse duration. The light intensity dependences on the phase difference between the ordinary and extraordinary rays, taking into account scattering are derived. For the relaxation process, good agreement is obtained between the experimental and calculated time dependences of the laser radiation intensity transmitted through the entire liquid crystal layer, with the exception of a thin transitional near-surface layer. The anomaly in the course of the relaxation curve run in the transition layer is considered within the framework of the known model concepts.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostikov D. A., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Nematic structures under conical anchoring at various director tilt angles specified by polymethacrylate compositions
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [20-42-240007]
Место публикации : Polymers. - 2021. - Vol. 13, Is. 17. - Ст.2993. - ISSN 2073-4360(eISSN), DOI 10.3390/polym13172993
Примечания : Cited References: 49. - Mikhail N. Krakhalev and Oxana O. Prishchepa acknowledge financial support from Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (No 20-42-240007)
Предметные рубрики: LIQUID-CRYSTAL
PRETILT ANGLE
ALIGNMENT LAYERS
SURFACE
INTERFACE
Аннотация: Dependence of the director tilt angle of nematic liquid crystal (LC) under conical anchoring from the two-component polymer mixture composition has been studied. We varied the ratio of poly(isobutyl methacrylate) (PiBMA), which specifies a conical anchoring for the nematic liquid crystal LN-396, and poly(methylmethacrylate) (PMMA) assigning a tangential alignment for the same nematic. An oblique incidence light technique to determine a tilt angle has been used. It has been shown that the tilt angle increases from 0∘ to 47.7∘ when PiBMA:PMMA ratio changes in the range 30:70 to 100:0. The specific optical textures viewed under the polarizing microscope and proper orientational structures have been considered for various compositions of the polymer films. An electric field action on the formed orientational structures has been investigated. The obtained results are promising for the application in various electro-optical LC devices with a conical anchoring in which the director tilt angle is a crucial parameter: a controlled diffraction gratings, an electrically operated achromatic rotators of linear light polarization, etc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Barannik A. V., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Light interference in a hybrid-aligned nematic layer with nonordered surface disclination lines
Место публикации : J. Opt. Soc. Am. B. - 2020. - Vol. 37, Is. 7. - P.2053-2057. - ISSN 0740-3224, DOI 10.1364/JOSAB.395976. - ISSN 1520-8540(eISSN)
Примечания : Cited References: 19
Предметные рубрики: LIQUID-CRYSTAL
SCATTERING
DEFECTS
DOMAINS
Аннотация: The propagation of a laser beam through a hybrid-aligned nematic layer with a surface disclination line has been investigated. A model of the light interference has been developed to consider the scattering by the structural inhomogeneities. The analytical expression that includes the factor characterizing an exponential decrease in the light scattering has been obtained. The dependence of the intensity of light transmitted through the layer on the magnetic field has been measured. The dependence has been accompanied by the interference oscillations. The theoretical expression is consistent with the experiment, which confirms the correctness of the model concepts.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Gunyakov V. A., Myslivets S. A., Gerasimov V. P., Zyryanov V. Y., Vetrov S. Y., Shabanov V. F.
Заглавие : One-dimensional photonic crystals with a planar oriented nematic layer: Temperature and angular dependence of the spectra of defect modes
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 2. - P388-398. - ISSN 1063-7761, DOI 10.1134/S1063776108020179
Примечания : Cited References: 58
Предметные рубрики: LIQUID-CRYSTAL
TRANSMISSION SPECTRUM
BANDGAP STRUCTURES
PERIODIC STRUCTURE
REFRACTIVE-INDEX
LATTICE-DEFECTS
LASER
ENHANCEMENT
SILICON
MICROCAVITIES
Аннотация: Transmission spectra of a one-dimensional photonic crystal (PC) formed by two multilayer dielectric mirrors and a planar oriented layer of 5CB nematic liquid crystal (LC) that is sandwiched between these mirrors and serves as a structure defect are investigated experimentally. Specific features of the behavior of the spectrum of defect modes as a function of the angle of incidence of light on the crystal are studied for two polarizations: parallel and perpendicular to the director of the LC; the director either lies in the plane of incidence or is perpendicular to it. It is shown that, for the configurations considered, the maxima of the defect modes shift toward the short-wavelength region as the tilt angle of incidence radiation increases; this tendency is more manifest for the parallel-polarized component, when the director lies in the plane of incidence. In the latter case, the width of the photonic band gap (PBG) appreciably decreases. The temperature dependence of the polarization components of the transmission spectra of a PC is investigated in the case of normal incidence of light. The spectral shift of defect modes due to the variation of the refractive index of the LC at the nematic-isotropic liquid phase transition point is measured. It is shown that, in real PCs, the amplitude of defect modes decreases when approaching the center of the band gap, as well as when the number of layers in the dielectric mirrors increases. Theoretical transmission spectra of the PCs calculated by the method of recurrence relations with regard to the decay of defect modes are in good agreement with experimental data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Lee W., Zyryanov V. Ya.
Заглавие : Electro-optical response of an ionic-surfactantdoped nematic cell with homeoplanar-twisted configuration transition
Коллективы : Russian Foundation for Basic Research [12-03-00816]; Siberian Branch of the Russian Academy of Sciences (SB RAS) [30, 24.32]; Ministry of Science and Technology of Taiwan through an NSC-SB-RAS joint project [NSC 103-2923-M-009-003-MY3]
Место публикации : Opt. Mater. Express: Optical Society of America, 2014. - Vol. 4, Is. 4. - P.810-815. - ISSN 2159-3930, DOI 10.1364/OME.4.000810
Примечания : Cited References: 16. - This work was partially supported by the Russian Foundation for Basic Research (project No. 12-03-00816), and by the Siberian Branch of the Russian Academy of Sciences (SB RAS) through Grants Nos. 30, 24.32, and by the Ministry of Science and Technology of Taiwan under Grant No. NSC 103-2923-M-009-003-MY3 through an NSC-SB-RAS joint project.
Предметные рубрики: LIQUID-CRYSTAL
ORIENTATION
SURFACES
LAYER
Аннотация: This study is concerned with the optical response of an electro-optical material consisting of nematic liquid crystal as well as ionic surfactant as a dopant. The dopant is a key component to carry out the working of the resulting device through configuration switching. The operational principle is based on the surface anchoring transition induced by a steady electric field. The dynamic characteristics of the electro-optical cell can be considerably improved when the nematic layer is reoriented from the initially homeoplanar director configuration into the twisted state. Besides, a method to shorten the relaxation time is demonstrated by using a controlling pulse with a bipolar waveform. (C)2014 Optical Society of America
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Timofeev I. V., Lin Y. T., Gunyakov V. A., Myslivets S. A., Arkhipkin, V. G., Vetrov S. Y., Lee W., Zyryanov V. Ya.
Заглавие : Voltage-induced defect mode coupling in a one-dimensional photonic crystal with a twisted-nematic defect layer
Место публикации : Phys. Rev. E: American Chemical Society, 2012. - Vol. 85, Is. 1. - Ст.11705. - ISSN 1539-3755, DOI 10.1103/PhysRevE.85.011705
Примечания : Cited References: 39. - This work was supported in part by DSP Grant No. 2.1.1/3455; RAS Grants No. 3.9.1 and No. 21.1, SB RAS Grants No. 5 and No. 144, and by the National Science Council of Taiwan under Grant No. NSC 98-2923-M-033-001-MY3.
Предметные рубрики: LIQUID-CRYSTAL
REFLECTION SPECTRUM
OPTICAL-PROPERTIES
ANISOTROPIC MEDIA
ELECTRIC-FIELD
EIGENVALUES
ORIENTATION
Аннотация: Defect modes are investigated in a band gap of an electrically tunable one-dimensional photonic crystal infiltrated with a twisted-nematic liquid crystal. Their frequency shift and interference under applied voltage are studied both experimentally and theoretically. We deal with the case where the defect layer thickness is much larger than the wavelength (i.e., the Mauguin condition). It is shown theoretically that the defect modes could have a complex structure with elliptic polarization. Two series of polarized modes are coupled with each other and exhibit an avoided crossing phenomenon in the case of opposite parity.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Electrically induced anchoring transition in nematics with small or zero dielectric anisotropy
Коллективы : Russian Foundation for Basic Research [15-02-06924, 16-53-00073, 16-32-60036, 16-32-00164]; Siberian Branch of Russian Academy of Sciences [II.2P 0358-2015-0010]
Место публикации : Liq. Cryst.: Taylor & Francis, 2017. - Vol. 44, Is. 3. - P.577-581. - ISSN 0267-8292, DOI 10.1080/02678292.2016.1225840. - ISSN 1366-5855(eISSN)
Примечания : Cited References:23. - This work was supported by Russian Foundation for Basic Research under Grants [15-02-06924 and 16-53-00073] and by the Siberian Branch of Russian Academy of Sciences under Complex Program [II.2P 0358-2015-0010]. V.S.S. acknowledges financial support from Russian Foundation for Basic Research under Grants [16-32-60036 and 16-32-00164].
Предметные рубрики: LIQUID-CRYSTAL
IONIC MODIFICATION
ORIENTATION
ALIGNMENT
DROPLETS
Ключевые слова (''Своб.индексиров.''): nematic--ionic surfactant--anchoring transition--hybrid homeoplanar--structure--dielectric anisotropy--electrooptics
Аннотация: The orientational transitions induced by electrically controlled ionic modification of surface anchoring in liquid crystal cells based on the nematics with small or zero dielectric anisotropy Δε are considered. The type of director reorientation is shown to be independent of the sign of dielectric anisotropy and can be the same for the nematics with both negative and positive Δε. Besides, the orientational transition and corresponding switchable optical states do not depend on the Δε value and can be effectively realised even for the nematics with zero dielectric anisotropy.
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