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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович
Заглавие : Модуляция светопропускания в самоорганизованных ансамблях нематических доменов
Колич.характеристики :9 с
Место публикации : Жидк. крист. и их практич. использ. - 2023. - Т. 23, № 4. - С. 49-57. - ISSN 19913966 (ISSN), DOI 10.18083/LCAppl.2023.4.49; Liq. Cryst. Appl. - ISSN 24999644 (eISSN)
Примечания : Библиогр.: 23
Аннотация: С использованием электрического поля исследовано пропускание света, прошедшего через самоорганизованные ансамбли нематических доменов. Проведено сравнение модуляционных характеристик ансамблей, содержащих домены с неориентированными и сориентированными в магнитном поле линиями дисклинаций. Показано существенное снижение рассеяния света при ориентации линий. Получены расчетные и экспериментальные зависимости пропускания света от электрического напряжения, прикладываемого к жидкокристаллическим ячейкам. Приведены хорошо совпадающие экспериментальные и рассчитанные из полученных ранее выражений зависимости. Изучены осцилляции на кривых светопропускания. Рассмотрены суперпозиции обыкновенных и необыкновенных волн, распространяющихся через доменные ансамбли и однородные планарные слои жидких кристаллов. Представлены спектральные характеристики ансамблей.Using an electric field, the transmission of light passing through self-organized ensembles of nematic domains is studied. The modulation characteristics of ensembles containing domains with unoriented and magnetic-field-oriented disclination lines are compared. A significant decrease in light scattering is shown when the lines are oriented. Calculated and experimental dependences of light transmission on the electric voltage applied to liquid crystal cells are obtained. Well agreeing experimental and calculated dependences obtained from the previously expressions are given. Oscillations on light transmission curves are studied. Superpositions of ordinary and extraordinary waves propagating through domain ensembles and homogeneous planar LC layers are considered. The spectral characteristics of the ensembles are presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shetty P. P., Babu M., Maksimov D. N., Bingi J.
Заглавие : Thermo-optic refraction in MoS2 medium for “Normally on” all optical switch
Место публикации : Opt. Mater. - 2021. - Vol. 112. - Ст.110777. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2020.110777
Примечания : Cited References: 25. - Authors acknowledge the funding support from DST India under INT/RUS/RFBR/P-262
Аннотация: Two dimensional (2D) nanomaterials like Molybdenum disulfide (MoS2) have been drawing a lot of interest due to their excellent nonlinear optical response. In this research we study thermal lens formation in MoS2 nanoflakes dispersion using mode mismatched pump probe configuration. Observation of the pump and probe beam intensity patterns gave visual insights on time evolution of photothermal lens formation. Effect of MoS2 nanoflakes concentration on thermo-optic properties of dispersions were studied using thermal lens spectroscopy technique. Further, a thermo-optic refraction based technique to measure thermal lens size is proposed. Thermal lens region size increased with increase in pump power. The observed thermal lens modulation is applied to demonstrate ‘normally on’ all optical switch which showed excellent modulation of output beam signal by pump beam.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : The incommensurate magnetic structure of a tetragonal antiferromagnet with antisymmetric exchange
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P.979-988. - ISSN 1063-7761, DOI 10.1134/S1063776109120097
Примечания : Cited References: 34
Предметные рубрики: FLUCTUATION-INDUCED PHASE
FIELD-INDUCED GAP
COPPER METABORATE
WEAK FERROMAGNETISM
SOLITON LATTICE
SPIN-WAVES
CUB2O4
BA2CUGE2O7
CSCUCL3
CHAINS
Ключевые слова (''Своб.индексиров.''): anti-symmetric--antiferromagnetic sublattices--antiferromagnets--antisymmetric exchange--exchange bonds--ferromagnetic component--ferromagnetic moments--ginzburg-landau functional--incommensurate magnetic structures--mean field approximation--modulation vectors--polarization planes--polarization vectors--symmetry groups--antiferromagnetic materials--antiferromagnetism--crystal orientation--crystal symmetry--ferromagnetic materials--ferromagnetism--magnetic devices--magnetic structure--modulation--polarization--vector spaces--vectors--crystallography
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Osipova I. V., Churilov G. N., Glushchenko G. A., Lopatin V. A., Vnukova N. G., Tomashevich Y. V.
Заглавие : The formation of higher and endohedral fullerenes in the plasma of high-frequency arc with low-frequency modulation under elevated helium pressure
Коллективы : "Advanced Carbon Nanostructures", International Conference
Место публикации : Int. Conf. "Adv. Carbon Nanostruct." (ACNS): Abstract of inv. lect. and contrib. papers. - St. Petersburg, 2013. - P.140
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Sutormin V. S., Myslivets S. A., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Synchronously controlled optical modes in the transmittance and reflectance spectra of multilayer photonic structure with dual-frequency nematic liquid crystal
Место публикации : Phys. Rev. E. - 2022. - Vol. 105, Is. 2. - Ст.024702. - ISSN 2470-0045, DOI 10.1103/PhysRevE.105.024702. - ISSN 2470-0053(eISSN)
Примечания : Cited References: 31
Предметные рубрики: ANGULAR-DEPENDENCE
DEFECT MODES
FILTER
TRANSMISSION
MODULATION
Аннотация: A method for electrically controlled synchronous mode tuning in the transmittance and reflectance spectra of a photonic structure consisting of an asymmetric dielectric Fabry-Perot microcavity and an ultrathin metallic film has been proposed. The excitation of a broadband Tamm plasmon polariton at a metal/Bragg mirror interface is accompanied by the two phenomena opposing one another. Due to the strong absorption induced by the metal, a sufficient rejection level in the reflection of the off-resonant radiation has been obtained in a wide spectral range, which almost coincides with the photonic band gap, while at the cavity mode frequencies the structure becomes transparent for the reflected radiation. This leads to the appearance of a series of narrow resonance peaks in the reflectance spectra that coincide in frequency with the transmittance peaks. Based on the structural transformations in the dual-frequency nematic liquid crystal used as a photonic structure defect, the tuning of the modes corresponding to the extraordinary waves to both the short- and long-wavelength spectral ranges has been implemented.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spin waves in multilayers with different magnitudes of the magnetization, exchange, and anisotropy
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.71-74. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.71. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): band gaps--magnonic crystals--rectangular and sinusoidal modulation--spin waves--superlattices--adjacent layers--magnetic parameters--magnon crystals--magnonic crystals--material parameter--sinusoidal modulation--spin-wave spectrum--energy gap--magnetic materials--spin waves--superlattices--multilayers
Аннотация: The spin-wave spectrum in one-dimensional magnon crystals - periodic superlattices (SLs) is investigated for the rectangular and sinusoidal modulation profile of the material parameters. The dependences of band gaps in the spectrum on both the difference of the magnetic parameters in adjacent layers and the ratio of the layer thicknesses are calculated. В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hsiao Yu-Cheng, Zou Yi-Hong, Timofeev I. V., Zyryanov V. Ya., Lee W.
Заглавие : Spectral modulation of a bistable liquid-crystal photonic structure by the polarization effect
Место публикации : Opt. Mater. Express. - 2013. - Vol. 3, Is. 6. - P.821-828. - DOI 10.1364/OME.3.000821
Аннотация: The light polarization has an effect on spectral properties of a multilayered photonic crystal infiltrated with a bistable chiral-tilted homeotropic nematic liquid crystal (LC) as a defect layer. By varying the direction of polarization of incident, linearly polarized light interacting with the birefringent LC, the tunability of defect modes in wavelength and amplitude and the broadening of the low-transmittance range can be realized in the transmission spectrum. The LC features two optically stable states and two voltage-sustained states. The bistability makes the device of low energy consumption. Such a hybrid can be used as not only a wavelength selector, optical shutter or multichannel switch but also a stopband-tunable device.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : EVERYANOV E. M., GUNYAKOV V. A.
Заглавие : REARRANGEMENT AND MODULATION OF SPECTRAL POSITION OF DYE ABSORPTION-BAND IN ORIENTING MATRIX
Место публикации : Pisma Zhurnal Tek. Fiz.: MEZHDUNARODNAYA KNIGA, 1990. - Vol. 16, Is. 18. - P46-50. - ISSN 0320-0116
Примечания : Cited References: 4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G.
Заглавие : Quasi-phase-matched second-harmonic generation in nonlinear crystals with harmonic modulation of nonlinearity
Место публикации : Laser Phys. - 2020. - Vol. 30, Is. 4. - Ст.045401. - ISSN 1054660X (ISSN), DOI 10.1088/1555-6611/ab7381
Примечания : Cited References: 20
Аннотация: We propose a new type of nonlinear photonic crystal with the lattice representing a harmonic function of the propagation coordinate. This type of spatial modulation of the quadratic nonlinearity is implemented to enhance the second-harmonic generation (SHG) efficiency. The process resembles that realized in periodic nonlinear photonic crystals with rectangular nonlinearity modulation under quasi-phase-matching. Residual periodic oscillations of the second-harmonic intensity were found. Comparison of the unipolar and bipolar modulations showed that they are equivalent with regard to the oscillations. The SHG efficiency in the harmonic lattices is 1.6 times lower compared with the efficiency corresponding to the quasi-phase-matching in periodic nonlinear photonic crystals with rectangular lattices.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Y., Smorgon S. L., Shabanov A. V., Pozhidaev E. P.
Заглавие : Optimization of the contrast, brightness, and modulation amplitude of light in electrooptic devices based on polymer-encapsulated ferroelectric liquid crystals
Место публикации : Tech. Phys. Lett. - 1998. - Vol. 24, Is. 6. - P.483-484. - ISSN 1063-7850, DOI 10.1134/1.1262154
Примечания : Cited References: 6
Аннотация: An analysis is made of the relations connecting the maximum optical transmittance, the light modulation amplitude, and the contrast in a polymer-encapsulated ferroelectric liquid-crystal device to the geometry of device and the tilt angle theta of the director. The correctness of the calculations is confirmed by their agreement with experimental measurements. (C) 1998 American Institute of Physics. [S1063-7850(98)02806-7].
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