Библиотека института физики им. Л.В. Киренского СО РАН

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Найдено в других БД:

Каталог книг и брошюр библиотеки ИФ СО РАН (94)

Каталог журналов библиотеки ИФ СО РАН (12)

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=optical<.>)

Общее количество найденных документов : 907
Показаны документы с 1 по 20

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shtarev D. S., Kevorkyants R., Molokeev M. S., Shtareva A. V.
Заглавие : Effect of composition on the optical and photocatalytic properties of visible light responsive materials Bi26-xMgxO40
Место публикации : Inorg. Chem. - 2020. - Vol. 59, Is. 12. - P.8173-8183. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.0c00486
Примечания : Cited References: 41. - This study was supported by a grant from the Russian Science Foundation (Project No 19-73-10013). The authors acknowledge the help of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS in conducting the study and offering their research equipment. The authors also thank the Research Center on Nanophotonics, the Center for Physical Methods of Surface Investigation (Dr. Alexandra Koroleva), and the Computing Centre of the Saint-Petersburg State University. R.K. acknowledges financial support from a grant from the Saint-Petersburg State University (Pure ID 39054581)
Аннотация: We report the synthesis and the crystal and electronic structure as well as the optical and photocatalytic properties of novel photoactive materials of the general formula Bi26–xMgxO40. Two compounds with compositions of Bi24.28(3)Mg1.72(3)O40 and Bi24.05(3)Mg1.95(3)O40 are synthesized using the pyrolytic method. According to X-ray diffraction analysis, the materials are monocrystalline species. Their electronic bandgaps determined from Tauc plots are 2.41 eV [Bi24.28(3)Mg1.72(3)O40] and 2.69 eV [Bi24.05(3)Mg1.95(3)O40]. Keeping in mind that optical bandgaps are typically larger than their electronic counterparts, we find that the bismuthate bandgaps match well that of Bi24Mg2O40 (2.26 eV) predicted by density functional theory. Apparently, the synthesized bismuthates are indirect bandgap semiconductors just like Bi24Mg2O40. Both materials demonstrate nearly identical luminescence spectra. Their luminescence emission at 620 nm is most efficiently excited by 365 nm light. The materials’ photocatalytic properties are evaluated in a visible light-induced photocatalytic phenol degradation reaction. Rather low activity of both compounds is detected. However, Bi24.05(3)Mg1.95(3)O40 is ∼2 times more photocatalytically active than Bi24.28(3)Mg1.72(3)O40, which is associated with a higher Bi5+ content in the former.
Смотреть статью,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vetrov S. Ya., Timofeev I. V., Shabanov V. F.
Заглавие : Localized modes in chiral photonic structures
Место публикации : Phys. Usp. - 2020. - Vol. 63, Is. 1. - P.33-56. - ISSN 1063-7869, DOI 10.3367/UFNe.2018.11.038490. - ISSN 1468-4780(eISSN)
Примечания : Cited References: 251
Предметные рубрики: CHOLESTERIC LIQUID-CRYSTAL
CONTROLLED LIGHT-SCATTERING
SCULPTURED THIN-FILMS
Аннотация: We discuss chiral structures in self-organizing, artificial, and biological materials. A review of experimental studies and recent advances in the localization of light in chiral structures is given. The behavior of polarized resonant modes in such structures is examined using the example of a one-dimensional photonic crystal containing liquid crystal materials. The anomalous spectral shifts of transmission peaks are interpreted as the contribution of the geometric phase caused by the twisting of the layers of the liquid crystal. The optical Tamm state localized at the boundary between chiral and nonchiral mirrors in the form of a cholesteric layer and a polarization-preserving anisotropic mirror is analytically and numerically described. Considerable attention is paid to the presentation of the properties of localized optical modes in the cholesteric with a resonant metal-dielectric nanocomposite. New possibilities for controlling the properties of the photonic structure are noted, due to the combination of the dispersion of the resonant medium and the intrinsic dispersion of the cholesteric. Attention is focused on controlled hybrid modes in the cholesteric structure formed by the coupling of localized modes. Possible applications and further ways of developing the concept of chiral photonic structures are deliberated.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gardymova, Anna P., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Optical textures and orientational structures in cholesteric droplets with conical boundary conditions
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-72-10036]
Место публикации : Molecules. - 2020. - Vol. 25, Is. 7. - Ст.1740. - ISSN 1420-3049(eISSN), DOI 10.3390/molecules25071740
Примечания : Cited References: 53. - The authors are grateful for the financial support by the Russian Science Foundation (grant No. 18-72-10036).
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
CHIRAL NEMATIC DROPLETS
IONIC MODIFICATION
Аннотация: Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at the relative chirality parameter N0≤2.9 . The intermediate director configuration with the deformed circular defect is realised at 2.9N03.95 , and the layer-like structure with the twisted surface defect loop is observed at N0≥3.95 . The cholesteric layers in the layer-like structure are slightly distorted although the cholesteric helix is untwisted.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylova S. N., Aleksandrovsky A. S., Roginskii E. M., Krylov A. A., Gudim I. A., Vtyurin A. N.
Заглавие : Optical properties of the HoGa3(BO3)4 crystal: experiment and ab initio calculation
Место публикации : Ferroelectrics. - 2020. - Vol. 559, Is. 1. - P.135-140. - ISSN 00150193 (ISSN), DOI 10.1080/00150193.2020.1722015
Примечания : Cited References: 22. - This work was supported by the Russian Foundation for Basic Research (grant No 18-02-00754)
Аннотация: Single crystal of HoGa3(BO3)4 has been grown using solution-melt synthesis. The optical band gap determined from the measured absorption spectrum is due to direct allowed transition and equals to 4.14 eV. The optical properties of this crystal are calculated by the plane-wave pseudo-potential method based on density functional theory. The structure of the crystal has been optimized. The electronic structure of HoGa3(BO3)4 is calculated. The experimental and theoretical fundamental absorption spectra are compared. The calculated bandgap is in good agreement with the experimental data.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ekholm V., Chiuzbaian G. S., Sathe C., Nicolaou A., Guarise M., Simon M., Jaouen N., Luning J., Hague C. F., Gel'mukhanov F., Odelius M., Bjorneholm O., Rubensson, J-E
Заглавие : Core-hole localization and ultra-fast dissociation in SF6
Коллективы : Swedish Research Council (VR)Swedish Research Council; Russian Science FoundationRussian Science Foundation (RSF) [16-12-10109]
Место публикации : J. Phys. B. - 2020. - Vol. 53, Is. 18. - Ст.185101. - ISSN 0953-4075, DOI 10.1088/1361-6455/aba204. - ISSN 1361-6455(eISSN)
Примечания : Cited References: 36. - This work was supported by the Swedish Research Council (VR). The calculations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC). FG acknowledges support within the Russian Science Foundation (Project No. 16-12-10109)
Предметные рубрики: X-RAY-EMISSION
SYMMETRY-BREAKING
AB-INITIO
SPECTROSCOPY
SPECTRA
Аннотация: Resonant inelastic x-ray scattering spectra excited at the fluorine K resonances of SF6 have been recorded. While a small but significant propensity for electronically parity-allowed transitions is found, the observation of parity-forbidden electronic transitions is attributed to vibronic coupling that breaks the global inversion symmetry of the electronic wavefunction and localizes the core hole. The dependence of the scattering cross section on the polarization of the incident radiation and the scattering angle is interpreted in terms of local π/σ symmetry around the S–F bond. This symmetry selectivity prevails during the dissociation that occurs during the scattering process.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ikonnikov, Denis A., Vyunishev A. M.
Заглавие : Tailoring diffraction of light carrying orbital angular momenta
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-12-00203]
Место публикации : Opt. Lett. - 2020. - Vol. 45, Is. 14. - P.3905-3908. - ISSN 0146-9592, DOI 10.1364/OL.389019. - ISSN 1539-4794(eISSN)
Примечания : Cited References: 29. - Russian Science Foundation (19-12-00203).
Предметные рубрики: OPTICAL VORTICES
ENTANGLEMENT
TWEEZERS
Аннотация: A unified approach to controlling the diffraction of light carrying orbital angular momenta (OAM) is developed and experimentally verified in this Letter. This approach allows one to specify not only the number of diffraction maxima, their spatial frequencies, and the intensity distribution between them, but also the OAM in each maximum. It is verified that the approach can be used for structuring both single and multiple beams carrying OAMs. Simulations reveal phase singularities in structured beams. In addition, the approach makes it possible to shape the light in regular and irregular two-dimensional arrays with addressing the OAMs at each site. This approach offers new opportunities for singular optics.
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Баранник, Алексей Владимирович
Заглавие : Оптическое пропускание доменной структуры нематика на поверхности полимера в магнитном поле
Место публикации : Жидк. кристаллы и их практич. использ. - 2020. - Т. 20, Вып. 2. - С. 62-68. - ISSN 1991-3966, DOI 10.18083/LCAppl.2020.2.62; Liq. Cryst. Appl.
Примечания : Библиогр.: 20
Предметные рубрики: LIGHT-SCATTERING
DEFECTS
Аннотация: Исследовано распространение лазерного луча через слой гибридно-упорядоченного нематика с поверхностной линией дисклинации, состоящий из доменов с радиальной конфигурацией нематического директора на пленке поликарбоната. Ориентационная структура в объеме домена трансформируется в планарную одноосную, задаваемую линией дисклинации, либо в гомеотропную под действием магнитного поля. Получена зависимость интенсивности света, прошедшего через слой, от магнитного поля, прикладываемого перпендикулярно поверхности полимера. Оптическое пропускание сопровождалось интерференционными минимумами и максимумами. Представлена модель интерференции света, основанная на двулучепреломлении, учитывающая рассеяние на ориентационно-структурных неоднородностях доменного ансамбля. Из рассмотрения свободной энергии жидкого кристалла и эффектов двулучепреломления выведено аналитическое выражение, устанавливающее зависимость между интенсивностью света и напряженностью магнитного поля, совпадающее с экспериментом.The propagation of a laser beam through a layer of a hybrid ordered nematic on a polycarbonate film is studied. The nematic has a surface disclination line consisting of domains with a radial configuration of the nematic director. The orientational structure in the domain volume can be transformed into a planar uniaxial structure defined by a disclination line or into a homeotropic one under the influence of a magnetic field. The dependence of the light intensity transmitted through the layer on the magnetic field applied perpendicular to the polymer surface is obtained. Optical transmission was accompanied by interference minima and maxima. Light interference model based on birefringence which takes into account scattering by the orientation-structural inhomogeneities of the domain ensemble is presented. Considering the analysis of the liquid crystal free energy and the birefringence effects, an analytical expression is derived. It establishes the relationship between the light intensity and the magnetic field strength, which coincides with the experiment.
Смотреть статью,
РИНЦ,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Немцев, Андрей В.
Заглавие : Ab Initio study of the relation between the structural, magnetic, and optical properties of normal and inverse MnGa2O4 spinels
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [18-42-243019]
Место публикации : J. Exp. Theor. Phys. - 2020. - Vol. 130, Is. 3. - P.418-422. - ISSN 1063-7761, DOI 10.1134/S106377612002017X. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 20. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project no. 18-42-243019: "First-principles studies of the polarization, magnetic, electronic, and magnetoelectric properties of functional compounds with a spinel structure containing 3d and 4f ions."
Предметные рубрики: STABILITY
Аннотация: The electronic, magnetic, and optical properties of MnGa2O4 in the structure of the normal and inverse spinels are subjected to an ab initio investigation and comparison. The generalized gradient approximation (GGA) predicts that the normal MnGa2O4 spinel is a semiconductor with a bandgap of about 0.7 eV, and a bandgap in the structure of the inverse spinel appears only in terms of the GGA + U approach. A simple exchange interaction model is used to calculate exchange integrals. In both structure types, MnGa2O4 exhibits antiferromagnetic behavior, and the normal structure is energetically favorable. The inverse spinel becomes energetically favorable only when a negative pressure is applied. The absorption spectra of the normal spinel are found to have a spectral window at a wavelength larger than 450 nm.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

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.
Смотреть статью,
Читать в сети ИФ,
Scopus,
WOS
Найти похожие

10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Аверьянов, Евгений Михайлович
Заглавие : Оптическая анизотропия и ориентационный порядок одноосных пленок сопряженных полимеров
Место публикации : Жидк. кристаллы и их практич. использ. - 2020. - Т. 20, № 1. - С. 53-63. - ISSN 1991-3966, DOI 10.18083/LCAppl.2020.1.53; Liq. Cryst. Appl.
Примечания : Библиогр.: 14
Аннотация: Для одноосной пленки сопряженного полимера с макромолекулами в виде наборов субъединиц разной длины установлена связь компонент e(1,2)j(w) диэлектрической функции ej(w) = e1j(w) + ie2j(w) с параметром ориентационного порядка s дипольных моментов молекулярных переходов, отвечающих изолированной полосе поглощения света c поляризацией вдоль (j = || ) и нормально (j =. ) оптической оси пленки. Новые методы определения s реализованы для пленки полимера P3OT с плоскостной ориентацией субъединиц и известными зависимостями e(1,2)j(w) в областях прозрачности и низкочастотного электронного поглощения. Учтена анизотропия компонент fj(w) = 1 + Lj[ej(w) - 1] тензора локального поля. Экспериментальные значения компонент Lj тензора Лорентца для пленки P3OT определены с использованием зависимостей e1j(w) в видимой области прозрачности. Показано совместное влияние длины и ориентационного порядка субъединиц, а также динамических диполь-дипольных взаимодействий между субъединицами (эффектов локального поля) на положение максимумов полос e2j(w).The uniaxial film of conjugated polymer with macromolecules as a set of subunits of different lengths was studied. For this film, the connection between the components e(1,2)j(w) of the dielectric function ej(w) = e1j(w) + ie2j(w) and the orientation order parameter s was established. The orientation order parameter s of the dipole moments of molecular transitions corresponds to an isolated absorption band of light with polarization along (j = ||) and across (j =. the optical axis of the film. New methods have been implemented for determining s of the P3OT polymer film. The P3OT polymer film is characterized by a planar orientation of subunits and known dependences e(1,2)j(w) in the regions of transparency and low-frequency electron absorption. The anisotropy of the components fj(w) = 1 + Lj[ej(w) - 1] of the local-field tensor was taken into account. The experimental values of the components Lj of the Lorentz tensor for the P3OT film were determined using the dependences e1j(w) in the visible transparency region. The combined effect of the length and orientation order of the subunits, as well as dynamic dipole-dipole interactions between subunits (local-field effects) on the position of the maxima of the e2j(w) bands was shown.
Смотреть статью,
РИНЦ,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Chukalina E. P., Erofeev D. S., Jablunovskis A., Gudim I. A., Malkin B. Z.
Заглавие : High-resolution optical spectroscopy and modeling of spectral and magnetic properties of multiferroic ErFe3(BO3)4
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-12-00413]
Место публикации : Phys. Rev. B. - 2020. - Vol. 101, Is. 20. - Ст.205108. - ISSN 2469-9950, DOI 10.1103/PhysRevB.101.205108. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 38. - Financial support of the Russian Science Foundation under Grant No. 19-12-00413 is acknowledged.
Предметные рубрики: F-F TRANSITIONS
ENERGY-LEVELS
ER3+ IONS
GROWTH
Аннотация: We carried out the high-resolution broadband temperature-dependent polarized optical spectroscopy and theoretical studies of ErFe3(BO3)4 single crystals in the paramagnetic and antiferromagnetic (T˂TN=39K) phases. On the basis of the experimentally determined 45 crystal-field (CF) levels of Er3+ ions at sites with the C2 point symmetry, CF calculations were performed, a set of physically grounded CF parameters was obtained and used to model the temperature dependences of the Er magnetic moments measured in neutron-scattering experiments, as well as the magnetic susceptibility and magnetization of the compound; the contributions of the quasi-one-dimensional iron magnetic subsystem were calculated in the frame of the previously developed self-consistent four-particle cluster model. The modeling strongly supports an easy-plane collinear structure of iron magnetic moments and excludes earlier proposed additional magnetic phase.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Verpekin, Victor V., Semeikin, Oleg, V, Vasiliev A. D., Kondrasenko, Alexander A., Belousov Yu. A., Ustynyuk, Nikolai A.
Заглавие : Catalyzed M–C coupling reactions in the synthesis of σ-(pyridylethynyl)dicarbonylcyclopentadienyliron complexes
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-73-00150]
Место публикации : RSC Adv. - 2020. - Vol. 10, Is. 29. - P.17014-17025. - ISSN 2046-2069(eISSN), DOI 10.1039/d0ra02333g
Примечания : Cited References: 86. - This research was funded by a grant from the Russian Science Foundation (project No. 18-73-00150).
Предметные рубрики: NONLINEAR-OPTICAL PROPERTIES
METAL ALKYNYL COMPLEXES
CARBON BOND FORMATION
Аннотация: The reactions between terminal ethynylpyridines, (trimethylsilyl)ethynylpyridines and cyclopentadienyliron dicarbonyl iodide were studied under Pd/Cu-catalyzed conditions to develop a synthetic approach to the σ-alkynyl iron complexes Cp(CO)2Fe–C≡C–R (R = ortho-, meta-, para-pyridyl). Depending on the catalyst and reagents used, the yields of the desired σ-pyridylethynyl complexes varied from 40 to 95%. In some cases the reactions with ortho-ethynylpyridine gave as byproduct the unexpected binuclear FePd μ-pyridylvinylidene complex [Cp(CO)Fe{μ2-η1(Cα):η1(Cα)-κ1(N)-Cα=Cβ(H)(o-C5H4N)}(μ-CO)PdI]. The conditions, catalysts, and reagents that provide the highest yields of the desired σ-pyridylethynyl iron compounds were determined. The methods developed allowed the synthesis of the corresponding σ-4-benzothiadiazolylethynyl complex Cp(CO)2Fe–C≡C–(4-C6H3N2S) as well. Eventually, synthetic approaches to σ-alkynyl iron complexes of the type Cp(CO)2Fe–C≡C–R (R = ortho-, meta-, para-pyridyl, 4-benzothiadiazol-2,1,3-yl) based on the Pd/Cu-catalyzed cross-coupling reactions were elaborated.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Li, Mingze, Li, Yawen, Molokeev M. S., Zhao, Jing, Na, Guangren, Zhang, Lijun, Xia, Zhiguo
Заглавие : Halogen substitution in zero-dimensional mixed metal halides toward photoluminescence modulation and enhanced quantum yield
Место публикации : Adv. Opt. Mater. - 2020. - Vol. 8, Is. 16. - Ст.2000418. - ISSN 2195-1071, DOI 10.1002/adom.202000418
Примечания : Cited References: 34. - M.L., Y.L. contributed equaly to this work. This work was supported by the National Natural Science Foundation of China (51961145101, 51972118, and 51722202), Fundamental Research Funds for the Central Universities (FRFTP-18-002C1), the Guangdong Provincial Science &Technology Project (2018A050506004), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01 x 137). This work was also funded by RFBR according to the research project No. 19-52-80003. The work at Jilin University is supported by the National Natural Science Foundation of China (Grant No. 61722403 and 11674121) and Jilin Province Science and Technology Development Program (Grant No. 20190201016JC). Calculations were performed in part at the high performance computing center of Jilin University.
Предметные рубрики: WHITE-LIGHT EMISSION
PEROVSKITES
EXCITONS
Аннотация: Zero‐dimensional (0D) organic−inorganic hybrid metal halides haveunprecedented degrees of freedom for structural tunability and photoluminescence modulation. Here, the 0D isomorphic hybrid metal mixed halides (C9NH20)9Pb3Zn2Br19(1−x )Cl19x (x = 0–1) with continuous halogen contents control, exhibiting tunable emission and enhancement of photoluminescence quantum yield (PLQY) are reported. The competitive bromine to chlorine substitution process in (C9NH20)9Pb3Zn2Br19(1−x )Cl19x occurs first in [ZnBr4−x Clx ]2− tetrahedron before the [Pb3Br11−x Clx ]5− trimer. The increasing Cl content in samples from x = 0 to 1 results in an expected blue shift of emission peak from 565 to 516 nm, and meanwhile a strikingly room temperature PL quantum yield increase from 8% to 91%. Combined experimental characterizations and theoretical calculations indicate that the blue shift of interband transition energy is responsible for the emission peak shift. Moreover, with the increasing Cl content, the enhanced electron−phonon interaction and the weakened thermal‐assisted nonradiative recombination result in more efficient radiative transition channels and ultimately enhanced PLQY. The impact of halogen substitution on electronic structures and optical properties in 0D hybrid metal halides is emphasized in this work as a new strategy to promote the future development of new luminescent materials.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. I., Snytnikov V. N., Snytnikov V. N., Ishchenko A. V., Rakhmanova M. I., Molokeev M. S., Krylov A. S., Aleksandrovsky A. S.
Заглавие : Luminescence of monoclinic Y2O3:Eu nanophosphor produced via laser vaporization
Место публикации : Opt. Mater. - 2020. - Vol. 104. - Ст.109843. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2020.109843
Примечания : Cited References: 19. - This work is financially supported by the Russian Foundation for Basic Research № 19-32-60027
Аннотация: Europium doped Y2O3spherical nanoparticles with the diameter ~10 nmobtained via cw laser vaporization are shown to crystallize in monoclinic symmetry class (C2/m space group). The size of nanoparticles established via HRTEM coincides with coherent scattering region established by XRD. Luminescence spectrum in the vicinity of ultranarrow transition demonstrates three peaks consistent with three inequivalent positions of Eu3+ ion in monoclinic Y2O3 lattice. Hypersensitive transition dominates in the spectrum, admitting the lack of inversion symmetry at Cs sites occupied by Eu3+. The spectrum of hypersensitive transition is expanded to the red part of spectrum due intense transitions terminating at higher-lying components of crystal-field-split 7F2 energy level. Obtaining chromaticity coordinates (0.669, 0.331)and absolute quantum yield (~21%) is possible using red phosphor based on monoclinic Y2O3:Eu3+.
Смотреть статью,
Читать в сети ИФ,
Scopus,
WOS
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Matsynin A. A.
Заглавие : The effect of the impurities on the magnetic, electronic and optical properties of Mn5Ge3
Место публикации : Chin. J. Phys. - 2020. - Vol. 68. - P.9-18. - ISSN 05779073 (ISSN), DOI 10.1016/j.cjph.2020.06.027
Примечания : Cited References: 29. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects № № 19-42-240016 : «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions» and 18-42-243009: «New magnetic film nanocomposites based on layered GeO/Mn systems: synthesis, experimental and theoretical study of structural and magnetic properties». The calculations were performed with the computer resources of "Complex modeling and data processing research installations of mega-class" SRC "Kurchatovsky Institute” ( http://ckp.urcki.ru )
Аннотация: Earlier, we experimentally showed a significant effect of oxygen on the magnetic and structural properties of Mn5Ge3 due to the formation of a Nowotny phase of Mn5Ge3Ox. Here, in continuation of this study, we present a theoretical study of the magnetic and electronic properties of Mn5Ge3 and Mn5Ge3Dx (D = B, C, O). It was found that hexagonal Mn5Ge3 is a ferromagnetic metal with two nonequivalent manganese atoms in the structure. Our ab initio calculations also predict the existence of a spin-crossover in Mn5Ge3 under pressure. Impurities reduce saturation magnetization and electrical and thermal conductivity; however, the magnetic susceptibility and Curie temperature increase. Microscopic mechanisms of the effect of the impurities on the magnetic and electronic properties Mn5Ge3 are discussed.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

16.

Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Bukhanov E. R., Gurevich Y. L., Shabanova K. A.
Заглавие : A study of wheat wax optical properties
Коллективы : Photonics and Electromagnetics Research Symposium - Fall
Место публикации : Photonics and Electromagnetics Research Symposium - Fall (2019 ; Dec 17-20 ; Xiamen, China). Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall): IEEE, 2019. - P.2890-2897. - (Progress in Electromagnetics Research Symposium). - , DOI 10.1109/PIERS-Fall48861.2019.9021781
Примечания : Cited References: 36
Предметные рубрики: DIMENSIONAL PHOTONIC CRYSTALS
BLUE-GREEN FLUORESCENCE
Аннотация: Epicuticular waxes are a multifunctional interface between a plant and the environment. In this paper wheat leaves wax has been studied. Wax isolation was carried out using the method of gradual freezing in water followed by slow thawing. The morphology of the samples obtained was observed with a Hitachi SU3500 electron microscope. The structure period is determined by the nanotubes diameter which equals 150-200 nm. Random orientation of their long axes in the layer allows using a one-dimensional model to calculate the transmission spectrum of a photonic crystal with the help of the transfer matrix method. While making the calculations a defect that may be caused by possible interlayer heterogeneity also must be taken into account. Numerical modeling made it possible to identify the stop zone and the defective mode. Intense fluorescence appears in the optical area of the wax layer under ultraviolet radiation, thus increasing the efficiency of photosynthesis.
Смотреть статью,
WOS
Найти похожие

17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Bogdanov A. A., Bulgakov E. N.
Заглавие : Optical bistability with bound states in the continuum in dielectric gratings
Коллективы : Government of the Russian Federation through the ITMO Fellowship; Ministry of Science and Higher Education of Russian Federation, goszadanie [2019-1246]; RFBRRussian Foundation for Basic Research (RFBR) [18-32-20205]
Место публикации : Phys. Rev. A. - 2020. - Vol. 102, Is. 3. - Ст.033511. - ISSN 2469-9926, DOI 10.1103/PhysRevA.102.033511. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 53. - This work was financially supported by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program. A.A.B. also acknowledges support by the Ministry of Science and Higher Education of Russian Federation, goszadanie No. 2019-1246 and RFBR (18-32-20205)
Предметные рубрики: COUPLED-MODE THEORY
WAVE-GUIDE
TRANSITION
RESONANCE
ARRAYS
Аннотация: We consider light scattering by dielectric gratings supporting optical bound states in the continuum. Due to the presence of instantaneous Kerr nonlinearity critical field enhancement in the spectral vicinity of the bound state triggers the effect of optical bistability. The onset of bistability is explained theoretically in the framework of the temporal coupled-mode theory. As the central result we cast the problem in the form of a single field-driven nonlinear oscillator. The theoretical results are verified in comparison with numerical simulations.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chirkin A. S.
Заглавие : General formula for the natural width of optical parametric oscillator spectral lines
Место публикации : Laser Phys. Lett. - 2020. - Vol. 17, Is. 11. - Ст.115401. - ISSN 1612-2011, DOI 10.1088/1612-202X/abb6e6. - ISSN 1612-202X(eISSN)
Примечания : Cited References: 21
Предметные рубрики: QUANTUM-FLUCTUATIONS
PHASE MEASUREMENTS
STATES
NOISE
Аннотация: A new approach to the quantum analysis of the spectral linewidths of optical parametric oscillators (OPOs) is proposed. The approach is based on introducing a Hermitian frequency deviation operator. The spectral linewidths in the triply resonant OPO above-threshold regime have been calculated. It has been found that the width of the generated spectral line depends on the loss at all interacting frequencies, the photon number of frequency under study, and the threshold photon number of pump. The formula obtained for the spectral width is general; in particular cases, it yields the well-known results. The developed simple approach can be applied to the quantum analysis of the spectra of various oscillatory systems, for example, the multifrequency parametric and non-linear optomechanical interactions and lasers.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Giant resonant enhancement of optical binding of dielectric disks
Место публикации : J. Opt. Soc. Am. B. - 2020. - Vol. 37, Is. 11. - P.3335-3340. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.402659
Примечания : Cited References: 30. - Russian Science Support Foundation (19-02-00055)
Аннотация: Two-fold variation over the aspect ratio of each disk and distance between disks gives rise to numerous events of avoided crossing of resonances of individual disks. For these events, the hybridized anti-bonding resonant modes can acquire a morphology close to the Mie resonant mode with the high orbital momentum of an equivalent sphere. The �� factor of such resonance can exceed the �� factor of an isolated disk by two orders of magnitude. We show that dual incoherent counterpropagating coaxial Bessel beams with power 1mW/µm2 with frequency resonant to such anti-bonding Mie-like modes result in unprecedented optical binding forces up to tens of nano-Newtons for silicon micrometer-sized disks. We show also that the magnitude and sign of optical forces depend strongly on the longitudinal wave vector of the Bessel beams.
Смотреть статью,
Читать в сети ИФ,
Scopus,
WOS
Найти похожие

20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Giant resonant enhancement of optical binding of dielectric particles
Коллективы : Russian Foundation for Basic Research ProjectRussian Foundation for Basic Research (RFBR) [19-02-00055]
Место публикации : Phys. Rev. A. - 2020. - Vol. 102, Is. 4. - Ст.043518. - ISSN 2469-9926, DOI 10.1103/PhysRevA.102.043518. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 49. - This work was supported by Russian Foundation for Basic Research Project No. 19-02-00055. A.S. thanks D. Maksimov and E. Sherman for helpful discussions
Предметные рубрики: FORCE
SPHERES
BEAM
Аннотация: Optical coupling of two identical dielectric particles gives rise to bonding and antibonding resonances. The latter is featured by significant narrowing of the resonant width and strong enhancement of the Q factor for the high-index micron-size particles in subwavelength range. We consider particles shaped as spheres and disks under coaxial illumination of dual incoherent counterpropagating Bessel beams. In the case of spheres we derive analytical expressions for the optical binding (OB) force which decays and displays two periods of oscillations. For close distances the OB force enormously increases in the resonant regime. The case of two coaxial disks is featured by extremal enhancement of the Q factor owing to the twofold variation over the distance between disks and the aspect ratio of each disk compared to the case of two spheres. In that case we demonstrate enhancement of the OB force up to several tens of nanonewtons. We show that the magnitude and sign of the OB force strongly depend on the longitudinal wave vector of the Bessel beams.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие