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Light selective reflection asymmetry in cholesteric layer with planar–conical anchoring / M. A. Lesnoy, M. N. Krakhalev, W. Lee, V. Ya. Zyryanov // Opt. Mater. - 2025. - Vol. 162. - Ст. 116924, DOI 10.1016/j.optmat.2025.116924. - Cited References: 33. - The work was carried out within the state assignment of Federal Research Center KSC SB RAS and funded partially by the National Science and Technology Council, Taiwan through grant No. 113-2112-M-A49-022 . - ISSN 0925-3467. - ISSN 1873-1252
Кл.слова (ненормированные):
Cholesteric liquid crystal -- Orientational structure -- Selective light reflection -- Light scattering -- Boundary conditions -- Electric field
Аннотация: The orientational structure and spectral properties of a cholesteric layer with planar–conical boundary conditions are studied. Initially, a structure with circular-shaped domains characterized by double twisting of the surface linear defect is formed. Under the influence of an electric field, the domains take the shape of polygons. This system has an asymmetric selective reflection of light: the reflection of right-circularly polarized light close to 100% is observed at a normal incidence of radiation on the sample from the planar boundary conditions, while a selective reflection of light does not occur for radiation incident from the conical anchoring. The light transmission of the sample in the forward direction does not depend on which substrate the radiation falls on. This spectral behaviour is due to the peculiarity of the formation of the domain structure in the cholesteric layer, in which the circular domains are initially located only near the substrate with a conical anchoring. A practically uniform planar cholesteric structure is formed near another substrate with planar boundary conditions. The selective reflection asymmetry is reduced by an applied voltage in the range of 0 to 12 V. The cholesteric transforms into a scattering state at an applied voltage of 12 V˂U˂72 V and becomes a transparent at U˃72 V. Switching off the electric field, under the influence of which the cholesteric is in a transparent state, leads to the restoration of the asymmetry of selective light reflection.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, Krasnoyarsk, 660036, Krasnoyarskiy Region, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Academician Kirensky Street, 28, Krasnoyarsk, 660041, Krasnoyarskiy Region, Russian Federation
Institute of Imaging and Biomedical Photonics, College of Photonics, National Yang Ming Chiao Tung University, Guiren Dist., Tainan, 711010, Taiwan

Доп.точки доступа:
Lesnoy, M. A.; Лесной, М. А.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Lee, W.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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    Аномальный спектральный сдвиг дефектных мод мультислойной фотонной структуры с гибридно-упорядоченным холестериком / В. А. Гуняков, В. С. Сутормин, А. С. Зуев [и др.] // Жидк. крист. и их практич. использ. - 2024. - Т. 24, № 3. - С. 94-99 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2024.3.94. - Библиогр.: 3 . - ISSN 1991-3966. - ISSN 2499-9644
   Перевод заглавия: Anomalous spectral shift of defect modes of multilayer photonic structure with hybrid-aligned cholesteric
Кл.слова (ненормированные):
хиральная фотонная структура -- гибридно-упорядоченный холестерик -- дефектная мода -- аномальный спектральный сдвиг -- геометрическая фаза -- chiral photonic structure -- hybrid-aligned cholesteric -- defect mode -- anomalous spectral shift -- geometric phase
Аннотация: Исследованы изменения поляризационных и спектральных свойств мультислойной фотонной структуры с включением гибридно-упорядоченного холестерика в качестве дефекта, индуцированные переменным электрическим полем. Экспериментально определена величина аномального синего сдвига о-мод, соответствующего максимально достижимому вкладу неадиабатической геометрической фазы в общий фазовый набег, приобретаемый циркулирующей в резонаторе световой волной
The electrically induced changes in the polarized and spectral properties of a multilayer photonic structure with a hybrid-aligned cholesteric embedded as a defect have been investigated. The value of anomalous blue shift of o-modes corresponding to the maximum obtainable contribution of the non-adiabatic geometric phase to the total phase incursion acquired by the light wave circulating in the resonator has been experimentally determined.

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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:
Гуняков, Владимир Алексеевич; Gunyakov, V. A.; Сутормин, Виталий Сергеевич; Sutormin, V. S.; Зуев, Антон Сергеевич; Zuev A. S.; Тимофеев, Иван Владимирович; Timofeev, I. V.; Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.

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Photoinduced modification of cholesteric structure with tangential-conical boundary conditions / A. S. Abdullaev, M. N. Krakhalev, V. Ya. Zyryanov, P. S. Pankin // Proceedings of the 29th International liquid crystal conference (ILCC 2024). - Rio de Janeiro, 2024. - P. 218. - Cited References: 2. - РНФ грант № 24-12-20007, Красноярский краевой фонд науки . - ISBN 978-85-63273-60-4

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Держатели документа:
Институт физики им. Л. В. Киренского СО РАН
Сибирский федеральный университет

Доп.точки доступа:
Abdullaev, A. S.; Абдуллаев, Абылгазы Сабиралиевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Pankin, P. S.; Панкин, Павел Сергеевич; International Liquid Crystal Conference(29 ; 2024 ; July ; 21-26 ; Rio de Janeiro, Brazil)
}
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Lu, Zh. -W.
Adjustable active–passive dual-frequency liquid crystal smart window based on thermally responsive chiral molecules / Zh.-W. Lu, V. Ya. Zyryanov, W. Lee // J. Mol. Liq. - 2024. - Vol. 415, Part B. - Ст. 126383, DOI 10.1016/j.molliq.2024.126383. - Cited References: 31. - Special thanks go to Yi-Cheng Chang (Global Research and Development Center, Taiwan Semiconductor Manufacturing Company) for conceptualization and methodology. This research was funded by the National Science and Technology Council, Taiwan (Nos. 111-2112-M-A49-033 and 112-2112-M-A49-031) . - ISSN 0167-7322. - ISSN 1873-3166
Кл.слова (ненормированные):
Dual-frequency liquid crystal -- Crossover frequency -- Thermosensitive chiral dopant -- Cholesteric liquid crystal -- Dichroic dye -- Smart window
Аннотация: We present a cholesteric liquid crystal (CLC) smart window with both passive and active control mechanisms, capable of reversible thermo-optical switching from high-transmission to low-transmission states as the temperature increases. By incorporating a mixture of a thermoresponsive chiral dopant and a left-handed chiral dopant into dual-frequency liquid crystal (DFLC), we have produced thermosensitive CLC that exhibit weak left-handed chirality at low temperature and enhanced left-handed chirality at rising temperature. This change in chirality strength results in increasing thickness-to-pitch ratio as the ambient temperature increases, transforming the CLC texture from the homeotropic to fingerprint state. Additionally, we doped a dichroic dye into the thermosensitive CLC to promote the contrast ratio between the high-transmission homeotropic and low-transmission fingerprint optical textures. Simultaneously, dielectric anisotropy in the host DFLC at different frequencies allows for adjustable switching temperature and varying transparency level. This advancement in smart window technology offers more control options and holds significant potential for practical applications.

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Держатели документа:
Institute of Photonic System, College of Photonics, National Yang Ming Chiao Tung University, Guiren Dist., Tainan 711010, Taiwan
Kirensky Institute of Physics, Federal Research Center "Krasnoyarsk Scientific Center", Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Institute of Imaging and Biomedical Photonics, College of Photonics, National Yang Ming Chiao Tung University, Guiren Dist., Tainan 711010, Taiwan

Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.
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    Electrically tunable thermoresponsive optic switch for smart window application based on dye-doped cholesteric liquid crystal / Y. -C. Chang, S. -H. Yang, V. Y. Zyryanov, W. Lee // J. Mol. Liq. - 2023. - Vol. 388. - Ст. 122752, DOI 10.1016/j.molliq.2023.122752. - Cited References: 24. - This work was financially supported by National Science and Technology Council, Taiwan (NSTC), under Grant Nos. 110-2112-M-A49-023 and 111-2112-M-A49-033 . - ISSN 0167-7322. - ISSN 1873-3166
   Перевод заглавия: Электрически настраиваемый термочувствительный оптический переключатель для применения в «умных окнах» на основе холестерического жидкого кристалла, легированного красителем
Кл.слова (ненормированные):
Black dye -- Liquid-crystal devices -- Texture switching -- Smart window -- Cholesteric liquid crystal -- Optical switch
Аннотация: We demonstrate a cholesteric liquid crystal (CLC) smart window that functions as a reversible thermo-optic switch between a transparent state at a low temperature and a low-transmission state at a higher temperature. This smart window is based on the addition of a thermoresponsive handedness-reversible chiral dopant in a mixture of a typical chiral dopant, a dichroic dye and nematic liquid crystal, yielding a thermosensitized CLC. In such a homeotropically anchored dye-doped CLC, the thickness-to-pitch ratio increases as the temperature rises, causing the device to switch from the homeotropic texture to the fingerprint texture. The absorption characteristic of the dichroic dye enables the homeotropic and fingerprint configurations in the dye-doped CLC to create two distinct transmission levels—the transparent and opaque optically stable states, respectively. Such a switching mechanism entails no additional electric power and, thus, is energy-saving. Moreover, the switching temperature at which the texture transition takes place can be actively increased by increasing voltage for the smart window. This allows the CLC device to be perfectly adaptable to the need of a user and, in turn, applicable to a wider variety of environments.

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Держатели документа:
Institute of Lighting and Energy Photonics, National Yang Ming Chiao Tung University, Guiren Dist, Tainan, 711010, Taiwan
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center, ” Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Imaging and Biomedical Photonics, College of Photonics, National Yang Ming Chiao Tung University, Guiren Dist, Tainan, 711010, Taiwan

Доп.точки доступа:
Chang, Y.-C.; Yang, S.-H.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.
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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, V. Yu.; Barbashov, V. A.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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    Anomalous spectral shift of o-modes in multilayer photonic structure induced by homeotropic–homeoplanar transition in chiral–nematic defect layer / V. A. Gunyakov, V. S. Sutormin, I. V. Timofeev [et al.] // Photonics. - 2023. - Vol. 10, Is. 9. - Ст. 959, DOI 10.3390/photonics10090959. - Cited References: 39 . - ISSN 2304-6732
   Перевод заглавия: Аномальный спектральный сдвиг о-мод в мультислойной фотонной структуре индуцированный переходом от гомеотропной к гомеопланарной конфигурации в хиральном нематическом дефектном слое
Кл.слова (ненормированные):
liquid crystal -- hybrid aligned cholesteric -- ionic surfactant -- multilayer photonic structure -- geometric phase
Аннотация: A chiral nematic is embedded between multilayer mirrors to obtain voltage-inducible polarized resonance spectra. Initially, the nematic director is uniformly oriented perpendicular to the mirrors’ surfaces because the chiral nematic helix is completely untwisted due to the homeotropic boundary conditions specified by the adsorbed cations. Then, a voltage is applied to remove the layer of surface-active cations from the input mirror. The obtained twisted homeoplanar configuration has a helix pitch exceeding the layer’s thickness. The twisting leads to the anomalous blue shift of the o-modes in the transmittance spectrum of the photonic structure. This blue shift can be effectively compensated by repulsion of spectral peaks as a result of mode coupling in the vicinity of the virtual avoided crossing point. The experimental results obtained are confirmed numerically using the 4 ˣ 4 transfer matrix method and explained with the contribution of a geometric phase.

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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; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Shabanov, V. F.; Шабанов, Василий Филиппович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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    Tuning Q-factor and perfect absorption using coupled Tamm states on polarization-preserving metasurface / N. V. Rudakova, R. G. Bikbaev, L. E. Tyryshkina [et al.] // Photonics. - 2023. - Vol. 10, Is. 12. - Ст. 1391, DOI 10.3390/photonics10121391. - Cited References: 58 . - ISSN 2304-6732
   Перевод заглавия: Управление добротностью и идеальным поглощением с помощью связанных оптических таммовских состояний на сохраняющей поляризацию метаповерхности
Кл.слова (ненормированные):
bound state in the continuum -- optical Tamm state -- coupled modes -- cholesteric liquid crystal -- polarization-preserving metasurface
Аннотация: The circular polarization of light flips its handedness after a conventional metallic mirror reflection. Therefore, a polarization-preserving metasurface is a crucially important element in a series of chiral photonic structures. They include tunable cholesteric LCs and anisotropic photonic crystals. Chiral structures are rich in interfacial localized modes including Tamm states. In this report, coupled modes formed as a result of the interaction between two chiral optical Tamm states or a chiral optical Tamm state and a chiral Tamm plasmon polariton are analytically and numerically investigated. It is shown that the effective control of coupled modes can be carried out by changing the pitch of the cholesteric and the angle between the optical axis of the cholesteric and the polarization-preserving anisotropic mirror. The influence of the metasurface period on the spectral characteristics of coupled modes is investigated. The possibility of realizing a bound state in the continuum of the Friedrich–Wintgen type, resulting from the destructive interference of coupled modes, which leads to the collapse of the resonance line corresponding to the chiral optical Tamm state, has been demonstrated.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Rudakova, N. V.; Рудакова, Наталья Викторовна; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Tyryshkina, L. E.; Тырышкина, Лариса Егоровна; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович
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    Electrically induced structural transformations of a chiral nematic under tangential-conical boundary conditions / D. A. Kostikov, M. N. Krakhalev, O. O. Prishchepa, V. Ya. Zyryanov // Molecules. - 2023. - Vol. 28, Is. 23. - Ст. 7842, DOI 10.3390/molecules28237842. - Cited References: 30 . - ISSN 1420-3049
   Перевод заглавия: Электрически индуцированные трансформации структур хирального нематика с тангенциально-коническими граничными условиями
Кл.слова (ненормированные):
chiral nematic -- cholesteric -- conical anchoring -- polymethacrylate -- director tilt angle -- electrically induced transformation -- orientational structure -- polarizing optical microscopy
Аннотация: In this study, structural transformations induced by an electric field in the chiral nematic under tangential-conical boundary conditions have been considered. The composition influence of the orienting polymer films on the director tilt angles, the formation of orientational structures in the LC layer, as well as the electro-optical response and relaxation processes have been studied. It has been shown that the poly(tert-butyl methacrylate) concentration change in the orienting polymer mixture allows for smoothly controlling the director tilt angle without fixing its azimuthal orientation rigidly.

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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:
Kostikov, D. A.; Костиков, Денис Андреевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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10.

    Effect of elastic constants on electrically induced transition in twisted radial cholesteric droplets / V. Y. Rudyak, M. N. Krakhalev, A. P. Gardymova [et al.] // Sci. Rep. - 2022. - Vol. 12, Is. 1. - Ст. 9565, DOI 10.1038/s41598-022-13612-4. - Cited References: 42. - 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 2045-2322
   Перевод заглавия: Влияние констант упругости на электрически индуцированный переход в закрученных радиальных каплях холестерика
Аннотация: In this work, we investigated the behavior of cholesteric droplets with homeotropic boundary conditions experimentally and by computer simulations. Small droplets forming twisted radial structures were studied. We obtained two different paths of structural transformations under electric field in such droplets. The choice between these paths has probabilistic nature. The ratio between the two transition types was found to be sensitive to the elastic constants of LC forming the droplet. We suggest the principal approach for in situ estimation of ratios between elastic constants in cholesteric LCs deposited in polymer-dispersed LC material and discuss its strong and weak sides.

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Держатели документа:
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russian Federation
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:
Rudyak, V. Y.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Abdullaev, A. S.; Абдуллаев, Абылгазы Сабиралиевич; Alekseev, A. A.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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