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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyapina A. A., Pilipchuk A. S., Sadreev A. F.
Заглавие : Bound states with orbital angular momentum in the continuum of cylindrical non-axisymmetric waveguide
Место публикации : Ann. Phys. - 2018. - Vol. 396. - P.56-70. - ISSN 00034916 (ISSN), DOI 10.1016/j.aop.2018.05.020
Примечания : Cited References: 28. - This work has been supported by RFBR Grant 17-02-00440 . We thank D.N. Maksimov for discussions.
Ключевые слова (''Своб.индексиров.''): acoustic wave transmission--spinning trapped modes with orbital angular momentum
Аннотация: We consider acoustic wave transmission in a non-axisymmetric waveguide which consists of a cylindrical resonator of radius R and length L and two cylindrical waveguides of radius rR whose axes are shifted relative to the axis of the resonator and relative to each other by azimuthal angle Δϕ. We find multiple bound states in the continuum (trapped modes) with nonzero orbital angular momentum under variation of L due to full destructive interference of resonant modes leaking into waveguides. For Δφ₌π∕2 we find the degenerate bound states in the continuum whose contribution into the scattering wave function is complex and supports giant vortical acoustic intensity spinning inside the resonator.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Fedoseev A. D.
Заглавие : Effect of total reflection from a symmetric two-channel device with fermion path nonanalyticity points induced by Rashba spin-orbit coupling
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2018. - Vol. 82, Is. 5. - P.550-553. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873818050313
Примечания : Cited References: 8. - The reported study was funded by Russian Foundation for Basic Research (project nos. 16-42-242036, 16-42-243056, and 17-42-240441), Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund to the research (project nos. 22/17, 24/17, and 02/17).
Ключевые слова (''Своб.индексиров.''): electron transport--nonanalyticity--rashba spin-orbit coupling--regular polygon--spin-orbit couplings--symmetric systems--total reflection--transmission coefficients
Аннотация: The effect Rashba spin-orbit coupling has on transmission coefficient through a symmetric system with fermion path nonanalyticity points is illustrated using the example of a regular polygon-shaped chain. It is shown that the current passage through a device is blocked at the critical spin-orbit coupling values determined by the system’s geometry. At the near-critical spin-orbit coupling values, electron transport is possible only in a narrow range of energies.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pyatnov M. V., Timofeev I. V., Vetrov S. Ya., Rudakova N. V.
Заглавие : Coupled chiral optical Tamm states in cholesteric liquid crystals
Место публикации : Photonics. - 2018. - Vol. 5, Is. 4. - Ст.30. - ISSN 23046732 (ISSN), DOI 10.3390/photonics5040030
Примечания : Cited References: 38. - This research was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund, to the research Project Nos. 17-42-240464 and 18-42-243025.
Ключевые слова (''Своб.индексиров.''): cholesteric liquid crystal--optical tamm states--localization--transmission spectrum--optical devices
Аннотация: The modes formed by two coupled chiral optical Tamm states localized at the interfaces between a photonic cholesteric liquid crystal conjugated with polarization-preserving anisotropic mirrors have been analytically and numerically investigated. These modes are only excited at the diffracting polarization of incident light. As the cholesteric layer thickness decreases, the spectral splitting of the localized state frequency is predicted. The splitting value depends on the crystal layer thickness. At the nondiffracting circular polarization, the localized modes are not excited, and the system becomes similar to the Fabry-Perot cavity containing an anisotropic helical structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N.
Заглавие : Optical response induced by bound states in the continuum in arrays of dielectric spheres
Коллективы : Ministry of Education and Science of the Russian Federation (Minobrnauka) [N 3.1845.2017]; Russian Foundation for Basic Research (RFBR) [16-02-00314]
Место публикации : J. Opt. Soc. Am. B. - 2018. - Vol. 35, Is. 10. - P.2443-2452. - ISSN 0740-3224, DOI 10.1364/JOSAB.35.002443. - ISSN 1520-8540(eISSN)
Примечания : Cited References: 51. - Ministry of Education and Science of the Russian Federation (Minobrnauka) (State Contract N 3.1845.2017); Russian Foundation for Basic Research (RFBR) (16-02-00314).
Предметные рубрики: COUPLED-MODE THEORY
LIGHT LINE
ENHANCEMENT
TRANSMISSION
TRANSITION
Аннотация: We consider an optical response induced by bound states in the continuum (BICs) in arrays of dielectric spheres. By combining the quasi-mode expansion technique with coupled mode theory (CMT), we put forward a theory of the optical response by high-Q resonance surrounding BICs in momentum space. The central results are analytical expressions for the CMT parameters, which can be easily calculated from the eigenfrequencies and eigenvectors of the interaction matrix of the scattering systems. The results obtained are verified in comparison against exact numerical solutions to demonstrate that the CMT approximation is capable of reproducing Fano features in the spectral vicinity of the BIC. Based on the quasi-mode expansion technique, we derived the asymptotic scaling law for the CMT parameters in the vicinity of the Γ-point. It is rigorously demonstrated that the linewidth in the CMT approximation exhibits different asymptotic behavior depending on the symmetry of the BIC.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Konkolovich A. V., Zyryanov V. Ya., Miskevich A. A., Loiko V. A.
Заглавие : Spectral polarization of transmission radiation by uniaxially stretched polymer-dispersed liquid crystal films with modified interphase surface anchoring
Коллективы : European Conference on Liquid Crystals, Московский государственный университет им. М.В. Ломоносова
Место публикации : 14th Eur. Conf. Liq. Cryst. (ECLC): conf. programme/ чл. нац. орг. и прогр. ком. V. Ya. Zyryanov. - 2017. - Ст.P151. - Poster
Примечания : Библиогр.: 3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volochaev M. N., Tarasov I. A., Loginov Yu. Yu., Cherkov A. G., Kovalev I. V.
Заглавие : The regularities of phase formation in Fe3Si(111)/Si(111) structure at vacuum annealing
Коллективы : International Conference on Films and Coatings
Место публикации : J. Phys. Conf. Ser.: IOP, 2017. - Vol. 857, Is. 1. - Ст.012053. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/857/1/012053
Примечания : Cited References: 10
Ключевые слова (''Своб.индексиров.''): coatings--high resolution transmission electron microscopy--molecular beam epitaxy--silicon--transmission electron microscopy--phase formations--polycrystalline--polycrystalline film--si(111) substrate--vacuum-annealing--annealing
Аннотация: The regularities of phase formation and thermal stability in Fe3Si(111)/Si(111) structure at stepped vacuum annealing (350, 450 and 550 °C) were investigated. The layer of 32 nm Fe3Si was deposited onto Si(111) substrate by molecular beam epitaxy at 260 °C. Transmission electron microscopy (TEM) measurements demonstrated that the film thickness increases by ∼19 % at 350 °C annealing without changing the phase composition. The polycrystalline -FeSi sublayer was formed on the interface at 450 °C annealing. Further annealing at 550 °C led to the ∼ 80 nm polycrystalline film formation containing the crystallites of -FeSi, Fe5Si3, and β-FeSi2 phases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankin P. S., Vetrov S. Ya., Timofeev I. V.
Заглавие : Tunable hybrid Tamm-microcavity states
Место публикации : J. Opt. Soc. Am. B. - 2017. - Vol. 34, Is. 12. - P.2633-2639. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.34.002633
Примечания : Cited References: 50. - Russian Foundation for Basic Research (RFBR), Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund (17-42-240464); Scholarship of the President of the Russian Federation (SP-227.2016.5). P. S. P. acknowledges the support of the Scholarship of the President of the Russian Federation. The authors thank D. N. Gulkin and V. O. Bessonov for help and fruitful discussions.
Ключевые слова (''Своб.индексиров.''): 1-d photonic crystal--effect of temperature--external electric field--high sensitivity--isotropic state--microcavity modes--silver layer--transmission spectrums
Аннотация: Spectral manifestations of hybrid Tamm-microcavity modes in a 1D photonic crystal bounded with a silver layer and containing a nematic liquid crystal microcavity layer have been studied using numerical simulation. It is demonstrated that the hybrid modes can be effectively tuned owing to the high sensitivity of the liquid crystal to the temperature and external electric field variations. It is established that the effect of temperature on the transmission spectrum of the investigated structure is most pronounced at the point of the phase transition of the liquid crystal to the isotropic state, where the refractive index jump is observed.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Volochaev M. N., Kveglis L. I., Loginov Yu. Yu.
Заглавие : Lorentz microscopy methods for magnetic domain structure study
Коллективы : International Scientific Conference Reshetnev Readings
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2017. - Vol. 255, Is. 1. - Ст.012015. - , DOI 10.1088/1757-899X/255/1/012015
Примечания : Cited References: 12. - This research was supported by Fırat University Scientific Research Projects Unit MF.13.02). Authors acknowledge to Kemerli Firm (Turkey) for their material supports.
Ключевые слова (''Своб.индексиров.''): high resolution transmission electron microscopy--magnetic domains--magnetic structure--transmission electron microscopy
Аннотация: The capabilities of transmission electron microscope Hitachi HT7700 for magnetic domain structure (MDS) study of thin films using Lorentz transmission electron microscopy (LTEM) methods is discussed. Two methods of magnetic domain structure study (defocus method and aperture shift method, including low-angle electron diffraction (LAED)) in thin magnetic films were examined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Lemberg K. V., Shabanov V. F.
Заглавие : Study of an Electromagnetic Wave Transmission Line Based on Coupled Dielectric Resonators
Место публикации : Dokl. Phys. - 2019. - Vol. 64, Is. 11. - P.409-413. - ISSN 1028-3358, DOI 10.1134/S1028335819110053. - ISSN 1562-6903 (eISSN)
Примечания : Cited References: 7. - This study was supported by the Ministry of Science and Higher Education, project no. RFMEFI60417X0179.
Аннотация: An analog of an optical waveguide in the form of a chain of metallic nanoparticles has been investigated using modified cylindrical dielectric resonators in the microwave band. Similar to the plasma oscillations in spherical nanoparticles, the two lowest resonances of the dielectric resonator correspond to the dipole and quadrupole oscillatory modes. It is shown that a waveguide consisting of seven resonators exhibits high frequency selective properties and relatively low loss if the resonances of the quadrupole oscillatory modes are used to form its passband. The characteristics of the investigated waveguide remain almost unchanged at its bending by 90°, and the cross section of localization of the main part of the energy propagating in the waveguide is smaller than the electromagnetic wavelength by a factor of five, which approximately corresponds to the optical waveguides based on plasma oscillations in nanoparticles.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Prishchepa O. O., Shabanov A. V., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Polymer films with elongated droplets of nematic liquid crystal: light transmission, scattering, and polarization
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.H2-O-31
Примечания : Cited References: 3
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