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Общее количество найденных документов : 81
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1.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bikbaev R. G., Krakhalev M. N., Prishchepa O. O., Sutormin V. S., Timofeev I. V., Zyryanov V. Ya.
Заглавие : Active beam steering by cholesteric layer with tangential-conical boundary conditions
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 28th International Liquid Crystal Conference (ILCC 2022). - 2022. - Ст.PF.292
Примечания : Cited References: 2
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Vetrov S. Ya., Lee W.
Заглавие : All-dielectric polarization-preserving anisotropic mirror
Место публикации : OSA Contin. - 2018. - Vol. 1, Is. 2. - P.682-689. - ISSN 2578-7519, DOI 10.1364/OSAC.1.000682
Примечания : Cited References: 39. - Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund (17-42-240464). Ministry of Science and Technology, Taiwan (MOST) (106-2923-M-009-002-MY3).
Предметные рубрики: Nanophotonics, Metamaterials, and Photonic Crystals
Ключевые слова (''Своб.индексиров.''): cholesteric liquid crystals--circular polarization--electric fields--optical devices--phase plates--refractive index
Аннотация: The structure consisting of alternating uniaxial dielectric layers is known to produce reflection of the same polarization as the incident field; e.g., the right-hand elliptically polarized light preserves this right-handedness and ellipticity of polarization at reflection. The parameters permitting the properly-polarized reflectance to exceed 99% in a wide frequency range were considered both analytically and numerically. The mirror with tuned top-layer thickness is shown to have several times less polarization losses than the uniform mirror. The hybrid mirror with metallic bottom layer has a considerably reduced thickness.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Sutormin V. S., Timofeev I. V., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Anomalous spectral shift of o-modes in multilayer photonic structure induced by homeotropic–homeoplanar transition in chiral–nematic defect layer
Колич.характеристики :11 с
Место публикации : Photonics. - 2023. - Vol. 10, Is. 9. - Ст.959. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10090959
Примечания : Cited References: 39
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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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Local-field anisotropy in cholesteric liquid crystals
Коллективы : Presidium of the Russian Academy of Sciences; Siberian Branch, Russian Academy of Sciences
Место публикации : JETP Letters. - 2009. - Vol. 89, Is. 7. - P.324-327. - ISSN 0021-3640, DOI 10.1134/S0021364009070030
Примечания : Cited References: 12. - This work was supported by the Presidium of the Russian Academy of Sciences ( Basic Research Program, project no. 27.1) and by the Siberian Branch, Russian Academy of Sciences ( Interdisciplinary Basic Research Program, project no. 5).
Предметные рубрики: ORDER
POLARIZABILITY
Аннотация: The first experimental values of the Lorentz tensor components L (j) for the cholesteric and smectic A phases of derivatives of cholesterol have been obtained using the dispersion of the refractive indices in the visible range. The temperature dependence of the components L (j) has been determined; it is invariant with respect to the cholesteric-smectic A phase transition. The effect of the isotropization of the Lorentz and local field tensors with decreasing anisotropy of the molecular polarizability has been revealed.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Mean polarizability of molecules and anisotropy of the Lorentz tensor upon a nematic-smectic a phase transition: Their behavior in a homologous series
Место публикации : Russ. J. Phys. Chem. A: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 86, Is. 5. - P.720-728. - ISSN 0036-0244, DOI 10.1134/S0036024412050044
Примечания : Cited References: 37
Предметные рубрики: CHOLESTERIC LIQUID-CRYSTALS
REFRACTIVE-INDEX DATA
A PHASE
MESOMORPHIC PROPERTIES
ORIENTATIONAL ORDER
OPTICAL ANISOTROPY
LOCAL-FIELD
POLYMORPHISM
TEMPERATURE
A-monotone
Alkyl chain
Experimental values
Homologous series
Homologues
Limiting values
Lorentz
Mesophases
Molecular core
Molecular polarizabilities
Nematic
Orientational order parameters
Polarizabilities
Polarizability density
Quadratic dependence
A-monotone
Smectic
Smectic phase
Smectic phasis
Smectic-A phasis
Ключевые слова (''Своб.индексиров.''): molecular polarizability--anisotropy--phase transition--nematic--smectic--homologues
Аннотация: Experimental values of the mean polarizability of molecules, (gamma) over bar, and components of the Lorentz tensor, L-j, in the nematic and smectic A phases are obtained for a homologous series of n-alkyl-p-(4-ethoxybenzylideneamino)-alpha-methylcinnamates. Dependences of the (gamma) over bar and L-j values on the mesophase temperature, the orientational order parameter S of molecules, and the number n in the homologous series are revealed. The quadratic dependence of (gamma) over bar (S) in the nematic and smectic phases is established that is invariant with respect to the nematic-smectic A transition. Polarizability densities of the molecular core and the alkyl chain are found from the monotone decreasing dependence (gamma) over bar (n)/v (where v is volume per one molecule) in the smectic phase. The presence (or absence) of the odd-even alternation of L-j(n) in the nematic (smectic) phase is shown. A monotone decrease in the Lorentz tensor anisotropy L with an increase in n is revealed in the smectic phase, and limiting values L-j(n - infinity) are determined.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beloshapkin V. V., Tretyakov A. G.
Заглавие : Regular and chaotic structures of the cholesteric liquid-crystal in an external-field
Место публикации : Phys. Lett. A. - 1984. - Vol. 106, Is. 1-2. - P.47-50. - ISSN 0375-9601, DOI 10.1016/0375-9601(84)90490-0
Примечания : Cited References: 9
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7.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Bikbaev R. G., Pyatnov M. V., Vetrov S. Ya., Chen K.-P., Lee W.
Заглавие : Chiral optical Tamm state at the interface between multilayer polarization-preserving anisotropic mirror and cholesteric
Коллективы : Asian Conference on Liquid Crystals
Место публикации : The 4th Asian Conference on Liquid Crystals (ACLC 2019): abstracts. - 2019. - P.
Примечания : Библиогр.: 4
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Bikbaev R. G., Vetrov S. Ya., Lee W.
Заглавие : Chiral optical Tamm states at the interface between a cholesteric and an all-dielectric polarization-preserving anisotropic mirror
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.4-D-12
Примечания : Cited References: 3
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avdeeva A. Yu., Vetrov S. Ya., Bikbaev R. G., Pyatnov M. V., Rudakova N. V., Timofeev I. V.
Заглавие : Chiral optical Tamm states at the interface between a Dye-doped cholesteric liquid crystal and an anisotropic mirror
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [19-42-240004]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52006]
Место публикации : Materials. - 2020. - Vol. 13, Is. 15. - Ст.3255. - ISSN 1996-1944(eISSN), DOI 10.3390/ma13153255
Примечания : Cited References: 44. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 19-42-240004 and by Russian Foundation for Basic Research, project No. 19-52-52006
Предметные рубрики: PHASE
POLARIZATION
MODES
Аннотация: The resonant splitting of optical Tamm state numerically is demonstrated. The Tamm state is localized at the interface between a resonant chiral medium and a polarization-preserving anisotropic mirror. The chiral medium is considered as a cholesteric liquid crystal doped with resonant dye molecules. The article shows that the splitting occurs when dye resonance frequency coincides with the frequency of the Tamm state. In this case the reflectance, transmittance, and absorptance spectra show two distinct Tamm modes. For both modes, the field localization is at the interface between the media. The external field control of configurable optical and structural parameters paves the way for use in tunable chiral microlaser.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Bikbaev R. G., Pyatnov M. V., Vetrov S. Ya., Lee W.
Заглавие : Chiral optical Tamm states at the interface between an all-dielectric polarization-preserving anisotropic mirror and a cholesteric liquid crystal
Место публикации : Crystals. - 2019. - Vol. 9, Is. 10. - Ст.502. - ISSN 20734352 (ISSN), DOI 10.3390/cryst9100502
Примечания : Cited References: 48. - Russian Foundation for Basic Research (RFBR), Russia, grant No. 19-52-52006; Ministry of Science and Technology, Taiwan (MOST), grant No. 106-2923-M-009-002-MY3; M.V.P. thanks RFBR and KRSTSF for the research Project No. 18-42-243025.
Аннотация: As a new localized state of light, the chiral optical Tamm state exists at the interface between a polarization-retaining anisotropic mirror and a substance with optical activity. Considering a hybrid structure comprising a metal-free polarization-preserving mirror and a cholesteric liquid crystal, we highlight the high Q factor arising from the all-dielectric framework. The intensity of localized light decreases exponentially with increasing distance from the interface. The penetration of the field into the cholesteric liquid crystal is essentially prohibited for wavelengths lying in the photonic bandgap and close to the cholesteric pitch length. The dielectric mirror has its own photonic bandgap. The energy transfer along the interface can be effectively switched off by setting the tangential wave vector to zero. The spectral behavior of the chiral optical Tamm state is observed both as reflection and transmission resonance. This Fano resonance is analogous to the Kopp-Genack effect. Our analytics are well in line with precise calculations, which may pave a new route for the future development of intelligent design for laser and sensing applications.
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