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

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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Edelman I. S., Sokolov A. Е., Sukhachev A. L., Temerov V. L., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Valiev U. V.
Заглавие : Optical absorption and luminescence of Tm3+ and Yb3+ ions in huntite structure
Место публикации : Республиканская конференция «Оптические методы в современной физике», Ташкент, Узбекистан, 2008, с. 33-35
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Вид документа : Статья из журнала
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Автор(ы) : Malakhovskii A. V., Sokolov V. V., Karimov D.N.
Заглавие : Nature of magnetic circular dichroism and absorption spectra of f-f transitions in Na0.4Ho0.6F2.2 single crystal
Колич.характеристики :5 с
Место публикации : Chem. Phys. - 2024. - Vol. 581. - Ст.112257. - ISSN 03010104 (ISSN), DOI 10.1016/j.chemphys.2024.112257. - ISSN 18734421 (eISSN)
Примечания : Cited References: 25
Аннотация: We present first study of magnetic circular dichroism (MCD) spectra of Ho3+ ion in C4v local symmetry, which it has in fluorite Na0.4Ho0.6F2.2. Optical absorption and MCD spectra were studied in this single crystal in the region of 5I8 5F3, 5F2, 3K8 and 5G5 transitions in the temperature range 3.6–––90 K. It was revealed, that number of transitions observed in the MCD and absorption spectra coincides with the number of transitions only from the doublet E state to singlet excited states. The E-E type transitions are not active in MCD, but they are not observed in the absorption spectra either. Paramagnetic magneto-optical activities (MOA) of the absorption bands and their temperature dependences were measured and interpreted with the help of the theory based on the nature of f-f transitions allowance. The MCD spectra were also analyzed in approximation of the J,±MJ wave functions of the free atom. It was shown in particular, that the lowest initial state of the transitions observed at T ˃ 10 K had MJ = 7, but this is not the lowest state of the holmium ion in the crystal. A little lower there is a quasi-doublet with MJ = 8 and, accordingly, with a higher magneto-optical activity of transitions from it. However, the intensity of transitions from this state is low.
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Вид документа : Статья из журнала
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Автор(ы) : Begunovich L. V., Kovaleva E. A., Korshunov M. M., Shabanov V. F.
Заглавие : Absorption spectra of the purple nonsulfur bacteria light-harvesting complex: A DFT study of the B800 part
Колич.характеристики :7 с
Место публикации : J. Photochem. Photobiol. A: Chem. - 2024. - Vol. 450. - Ст.115454. - ISSN 10106030 (ISSN), DOI 10.1016/j.jphotochem.2023.115454. - ISSN 18732666 (eISSN)
Примечания : Cited References: 42. - This work was supported by the state assignment of the Ministry of Science and Higher Education of the Russian Federation. Authors would like to thank Information Technology Centre, Novosibirsk State University for providing access to their supercomputers. L.V.B. would like to thank Irkutsk Supercomputer Center of SB RAS for providing the access to HPC-cluster «Akademik V.M. Matrosov» (Irkutsk Supercomputer Center of SB RAS, Irkutsk: ISDCT SB RAS; http://hpc.icc.ru, accessed 20.10.2023)
Аннотация: We’ve studied the B800 part of Rhodoblastus acidophilus light-harvesting complex (LH2) by several quantum chemical techniques based on the density functional theory (DFT) and determined the specific method and a minimal reliable model suitable for further studies of the LH2. In addition to bacteriochlorophyll a molecules, the minimal model includes two α and one β chain amino acids. Within the model, we are able to reproduce the contribution of the B800 ring of nine bacteriochlorophyll a molecules to the near infrared Qy absorption band. We also discuss the use of hybrid DFT calculations for precise energy and optical estimations and DFT-based tight binding (DFTB) method for the large-scale calculations. Crucial importance of Hartree-Fock exchange interaction for the correct description of B800 peak position was shown.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova Yu. V., Aleksandrovsky A. S., Laptash N. M., Krylov A. S., Gerasimov M. A., Dubrovskiy A. A.
Заглавие : Raman scattering, absorption and luminescence spectroscopy of CoSiF6·6H2O crystal and CoSiF6·6H2O:Mn4+ red-emitting phosphor
Колич.характеристики :6 с
Место публикации : Opt. Mater. - 2023. - Vol. 144. - Ст.114343. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2023.114343. - ISSN 18731252 (eISSN)
Примечания : Cited References: 30. - The reported study was funded by Russian Science Foundation , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project ‘‘Synthesis, spectral and magnetic properties of ABF6·6H2O systems, new materials for photonics.” No. 23-22-10037 . https://rscf.ru/en/project/23-22-10037/ . Usage of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS is acknowledged. We thank A. Yu. Mamaev for recording the luminesce spectra of CoSiF6·6H2O:Mn 4+
Аннотация: CoSiF6·6H2O and CoSiF6·6H2O:Mn4+ crystals were investigated by means of Raman, optical absorption, and luminescence spectroscopy. Absorption spectra of CoSiF6·6H2O are analyzed by Tanabe-Sugano technique and are proved to be well-describable at crystal field strength Dq = 1000 cm−1, and Racah parameters B = 896 cm−1, C = 4408 cm−1, Dq/B = 1.116. Raman spectroscopy reveals a phase transition associated with the ordering of both the CoO6 and SiF6 octahedra, which occurs through the ordering of the H2O subsystem. Luminescence spectrum of Mn4+ ions in CoSiF6·6H2O lattice consists of six components corresponding to Stokes and anti-Stokes emission from 2E state of Mn4+ ion at vibrational frequencies of MnF6 octahedron ν6 = 230 cm−1, ν4 = 335 cm−1, and ν3 = 645 cm−1. Quantum efficiency of red emission maximizes at excitation wavelength 357 nm and equals to 5%. Decrease of quantum efficiency in comparison to other related materials is explained by absorption of Co2+ ions and non-radiative relaxation in the Co2+ subsystem.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Il’ichev A. V., Bouznik V. M.
Заглавие : Magnetic resonance imaging study of water absorption of polymer composite materials subjected to mechanical and temperature impact
Колич.характеристики :9 с
Место публикации : Russ. J. Phys. Chem. B. - 2023. - Vol. 17, Is. 6. - P.1361-1369. - ISSN 19907931 (ISSN), DOI 10.1134/S1990793123060064. - ISSN 19907923 (eISSN)
Примечания : Cited References: 18. - The research was carried out as part of a state assignment of the Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences (project no. 0287-2021-0012) using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences"
Аннотация: The results of a study of water absorption processes by samples of polymer composite materials (PCMs) based on fiberglass, subjected to low-speed impact with controlled impact energy and alternating temperature cycling are presented. Using magnetic resonance imaging (MRI), the distribution of absorbed water in the fiberglass structure is visualized and the dynamics of its accumulation in various areas of the sample are studied. It is found that mechanical impact leads to a nonuniform distribution of the absorbed water in the samples and a significant accumulation of free water in the areas of destruction and adjacent layers in the event of a violation of the integrity of the outer layer of the material. It is shown that cyclic alternating temperature effects do not lead to a noticeable change in the water absorption processes and are comparable in effect to mechanical nondestructive impacts. The results obtained using MRI are in close agreement with the data of traditional weight measurements, which shows the effectiveness of the method in diagnosing defects and mechanical damage to PCMs exposed to the humid environment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Bikbaev R. G., Tyryshkina L. E., Vetrov S. Ya., Timofeev I. V.
Заглавие : Tuning Q-factor and perfect absorption using coupled Tamm states on polarization-preserving metasurface
Колич.характеристики :12 с
Место публикации : Photonics. - 2023. - Vol. 10, Is. 12. - Ст.1391. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10121391
Примечания : Cited References: 58
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sukhachev A. L., Sokolov V. V., Gudim I. A., Kuchesheva-Titova V. R.
Заглавие : Transformation of 5I8→5F5 Ho absorption band in Ho0.75Nd0.25Fe3(BO3)4 crystal during spin-reorientation transition
Место публикации : Phys. B: Condens. Matter. - 2023. - Vol. 654. - Ст.414706. - ISSN 09214526 (ISSN), DOI 10.1016/j.physb.2023.414706. - ISSN 18732135 (eISSN)
Примечания : Cited References: 17
Аннотация: Polarized absorption spectra of crystal Ho0.75Nd0.25Fe3(BO3)4 in the region of the 5I8→5F5 absorption band of Ho ions were investigated depending on temperature in the range of 5–20 K. Absorption spectra are decomposed into components of the Lorentz form. The spin-reorientation phase transition was detected at 6.9 K. The observed line position shifts during the reorientation transition were different for different lines, which indicated different local magnetic anisotropy of the Ho ion in its excited states. Significant changes in absorption line intensities as a function of temperature were observed during the reorientation transition and above. These were explained as a consequence of the change in even components of the local crystal field in excited states. These components mix the closely spaced 4f states. Distortion of local symmetry in the ground state was detected at one of the electron transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankin P. S., Shabanov A. V., Maksimov D. N., Nabol S. V., Buzin D. S., Krasnov A. I., Romanenko G. A., Sutormin V. S., Gunyakov V. A., Zelenov, Fyodor V., Masyugin, Albert N., Vyatkin, Vladimir P., Nemtsev I. V., Volochaev M. N., Vetrov S. Ya., Timofeev I. V.
Заглавие : Asymmetric resonant light absorption in a chloroplast microstructure
Место публикации : J. Opt. Soc. Am. B. - 2023. - Vol. 40, Is. 1. - P.87-93. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.477110. - ISSN 15208540 (eISSN)
Примечания : Cited References: 45
Аннотация: It is shown that in the chloroplast periodic structure with a defect, the resonant absorption of light can be implemented. It is found that the resonant light absorption depends significantly on the position of a defect. In terms of the absorption of light energy, an asymmetric resonator is more efficient than a symmetric one.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Edelman I. S., Chou, Hsiung, Petrov D. A., Zharkov S. M., Neznakhin, Dmitry, Stepanova, Elena, Stepanov, Andrey
Заглавие : Magnetic circular dichroism of Co nanoparticles localized in matrices of various types
Место публикации : Materialia. - 2023. - Vol. 28. - Ст.101759. - ISSN 25891529 (eISSN), DOI 10.1016/j.mtla.2023.101759
Примечания : Cited References: 28. - This work was supported by the Russian Science Foundation [grant number 21-72-00061]. Electron microscopic studies were carried out in the laboratory of electron microscopy of the Joint Scientific Center of the Siberian Federal University
Аннотация: Magnetic and magneto-optical properties of cobalt nanoparticles (Co-NPs) dispersed in a transparent dielectric SiO2 and semiconductor ZnO matrices have been investigated. Field and temperature dependences of the samples magnetization showed the typical behavior of an ensemble of superparamagnetic particles with a blocking temperature near and below room temperature. The spectroscopy of magnetic circular dichroism (MCD) in the visible and near-infrared light ranges has revealed a significant difference between the behavior of the Co-NPs and a solid Co film. It has been found that the MCD spectrum shape for the Co-NPs does not depend on the matrix type. The room temperature magneto-optical activity of the Co-NPs in the different matrices has been estimated as an indicator for practical applications.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Аверьянов, Евгений Михайлович
Заглавие : Эффективные диэлектрическая проницаемость и показатель преломления квазидвумерной полидоменной пленки сопряженного полимера в области поглощения света
Место публикации : Жидк. крист. и их практич. использ. - 2023. - Т. 23, № 2. - С. 81-89. - ISSN 19913966 (ISSN), DOI 10.18083/LCAppl.2023.2.81; Liq. Cryst. Appl. - ISSN 24999644 (eISSN)
Примечания : Библиогр.: 15
Аннотация: Рассматривается одноосная пленка сопряженного полимера в плоскости XY с оптической осью Z, состоящая из статистически эквивалентных одноосных доменов среднего размера a. Оптические оси доменов nd хаотично ориентированы в плоскости XY. В области поглощения света домены характеризуются диэлектрическими проницаемостями εj = ε1j + iε2j и показателями преломления Nj = nj + ikj для обыкновенной (j = о) и необыкновенной (j = е) световых волн. Для волн с длиной λ ˃˃ a, волновым вектором k*⊥Z и поляризацией E⊥Z такая пленка является двумерной композитной средой с эффективной диэлектрической проницаемостью ε* = ε1 + iε2 и эффективным показателем преломления N* = n* + ik*. В данной работе получены соотношения, связывающие компоненты ε1*, ε2*, n*, k* с компонентами nj, kj. Для проверки этих соотношений и расчета компонент ε1*, ε2*, n*, k* вместо величин no, ko (ne, ke) использовались экспериментальные значения noA, koA (neA, keA) в областях прозрачности и электронного поглощения для одноосных монодоменных пленок сопряженного полимера F8BT с аксиальной ориентацией (OА) макромолекул относительно оптической оси nA в плоскости XY. Рассчитанные компоненты ε1*, ε2*, n*, k* сравнивались с экспериментальными значениями компонент ε1oP, ε2oP, noP, koP в тех же спектральных областях для обыкновенной световой волны с λ ˃˃ a, k*⊥Z и поляризацией E⊥Z в одноосных полидоменных пленках F8BT с плоскостной ориентацией (OP) макромолекул. Соотношения ε1* ≈ ε1oP, ε2* ≈ ε2oP, n* ≈ noP, k* ≈ koP, установленные здесь с хорошей точностью, показывают близость полидоменных пленок F8BT к идеальному двумерному поликристаллу.An uniaxial film of a conjugated polymer consisting of statistically equivalent uniaxial domains of the average dimension a is considered in the plane XY with the optical axis Z. The optical axes nd of domains are randomly oriented in the plane XY. In the region of light absorption, the domains are characterized by the dielectric constants εj = ε1j + iε2j and the refractive indices Nj = nj + ikj for an ordinary (j = о) and extraordinary (j = е) light waves. For the waves with wavelength λ ˃˃ a, wave vector k*⊥Z and polarization E⊥Z, such polydomain film is two-dimensional composite medium with effective dielectric constant ε* = ε1 + iε2 and effective refractive index N* = n* + ik*. In this work, the relations which connect the components ε1*, ε2*, n*, k* with the components nj, kj were established. For testing the relations and calculating the components ε1*, ε2*, n*, k*, the experimental values noA, koA (neA, keA) were used instead of values no, ko (ne, ke) in the transparency and electronic absorption regions for the uniaxial monodomain films of the conjugated polymer F8BT with axial orientation (OА) of macromolecules with respect to the optical axis nA in the XY plane. The calculated components ε1*, ε2*, n*, k* were compared with the experimental components ε1oP, ε2oP, noP, koP in the same spectral regions for an ordinary light wave with λ ˃˃ a, k*⊥Z, E⊥Z in the uniaxial polydomain F8BT films with in-plane orientation (OP) of macromolecules. The relations ε1* ≈ ε1oP, ε2* ≈ ε2oP, n* ≈ noP, k* ≈ koP established here with good precision show that the polydomain F8BT films are close to the ideal two-dimensional polycrystal.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Maksimov D. N., Pankin P. S., Ye, Ming-Jyun, Chen, Kuo-Ping, Timofeev I. V.
Заглавие : Enhanced light absorption in Tamm metasurface with a bound state in the continuum
Место публикации : Photonics Nanostruct. Fundam. Appl. - 2023. - Vol. 55. - Ст.101148. - ISSN 15694410 (ISSN), DOI 10.1016/j.photonics.2023.101148. - ISSN 15694429 (eISSN)
Примечания : Cited References: 47. - This research was funded by the Russian Science Foundation (project no. 22-42-08003). This work was supported by the Higher Education Sprout Project of the National Yang Ming Chiao Tung University and Ministry of Education and the National Science and Technology Council (NSTC 109-2628-E-007 -003 -MY3; 111-2923-E007 -008 -MY3; 111-2628-E-007-021)
Аннотация: We consider light absorption in a germanium grating placed on top of photonic-crystalline substrate. Such a system supports an optical Tamm state decoupled from the continuous spectrum with its frequency within the photonic band gap. We have demonstrated that application of the Tamm state makes in possible to engineer extremely narrow absorber which provides a 100 % absorption in a semiconductor grating in the critical coupling regime. The proposed design may be used at both normal and oblique incidence at the telecom wavelength.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Borisov R. V., Vorobyev S. A., Tomashevich Y. V., Romanchenko A. S., Likhatski M. N., Karacharov A. A., Bayukov O. A., Knyazev Yu. V., Velikanov D. A., Zharkov S. M., Krylov A. S., Krylova S. N., Nemtsev I. V.
Заглавие : Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide
Место публикации : J. Mater. Chem. A. - 2022. - Vol. 10, Is. 17. - P.9621-9634. - ISSN 20507488 (ISSN), DOI 10.1039/d2ta00877g
Примечания : Cited References: 84. - This research was supported by the Russian Foundation for Basic Research, Krasnoyarsk Territory Administration and Krasnoyarsk Territory Science Foundation, project 20-43-242903. Facilities of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were employed in the work
Аннотация: We introduce here a multifunctional material composed of alternating atomic sulfide sheets close to the composition of CuFeS2 and Mg-based hydroxide ones (valleriite), which are assembled due to their electric charges of opposite sign. Valleriite particles 50-200 nm in lateral size and 10-20 nm in thickness were synthesized via a simple hydrothermal pathway using various concentrations of precursors and dopants, and examined with XRD, TEM, EDS, X-ray photoelectron spectroscopy, reflection electron energy loss spectroscopy (REELS), Mossbauer, Raman and UV-vis-NIR spectroscopies, and magnetization, dynamic light scattering, and zeta potential measurements. The electronic, magnetic and optical characteristics are found to be critically dependent on the charge (electron density) at the narrow-gap sulfide layers containing Cu+ and Fe3+ cations, and can be tuned via the composition of the hydroxide part. Particularly, substitution of Mg2+ with Al3+ increases the negative charge of the hydroxide layers and reduces the content of Fe3+-OH centers (10-45% of total iron); the effects of Cr and Co dopants entering both layers are more complicated. Mossbauer doublets of paramagnetic Fe3+ detected at room temperature transform into several Zeeman sextets at 4.2 K; the hyperfine fields up to 500 kOe and complex magnetic behavior, but not pure paramagnetism or antiferromagnetism, were observed for valleriites with the higher positive charge of the sulfide sheets, probably due to the depopulation of the minority-spin 3d states of S-bonded Fe3+ ions. Aqueous colloids of valleriite show optical absorption at 500-750 nm, which, along with the peaks at the same energies in REELS, may arise due to quasi-static dielectric resonance involving the vacant Fe 3d band and being dependent on the composition of both layers too. These and other findings call attention to valleriites as a new rich family of 2D materials for a variety of potential applications.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Бикбаев, Рашид Гельмединович, Пыхтин Д. А., Ветров, Степан Яковлевич, Тимофеев, Иван Владимирович
Заглавие : Плазмонные массивы для увеличения поглощения солнечного элемента на основе таммовского плазмон-поляритона
Коллективы : Международная конференция по фотонике и информационной оптике, Российская академия наук, Национальный исследовательский ядерный университет "МИФИ"
Место публикации : XI Международная конференция по фотонике и информационной оптике: сборник научных трудов. - Москва, 2022. - С. 145-146. - ISBN 978-5-7262-2842-6
Примечания : Библиогр.:
Аннотация: В работе исследовано влияние формы плазмонной решѐтки на поглощающую способность активного слоя в органическом солнечном элементе на основе таммовского плазмон-поляритона. Расчѐты выполнены в рамках теории связанных мод и подтверждены методом трансфер-матрицы. Показано, что наибольшее поглощение в активном слое достигается в случае гексагональной решѐтки.The influence of the plasmonic array type on the absorptivity of the active layer in a Tamm plasmon polariton based organic solar cell has been investigated in the framework of the temporal coupled mode theory and confirmed by the transfer matrix method. It has been shown that optimal absorption in the active layer is achieved in the case of hexagonal array.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Bikbaev R. G., Pankin P. S., Vetrov S. Ya., Timofeev I. V., Chen, Kuo-Ping, Lee, Wei
Заглавие : Metal-dielectric polarization-preserving anisotropic mirror for chiral optical Tamm state
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); MOST [19-52-52006]; Higher Education Sprout Project of the National Yang Ming Chiao Tung University; Ministry of Science and Technology (MOST)Ministry of Science and Technology, China [108-2923-E-009-003-MY3]
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 2. - Ст.234. - ISSN 2079-4991(eISSN), DOI 10.3390/nano12020234
Примечания : Cited References: 46. - The reported study was funded by RFBR and MOST according to the research project No. 19-52-52006. This work was also supported by the Higher Education Sprout Project of the National Yang Ming Chiao Tung University and Ministry of Education and the Ministry of Science and Technology (MOST) No. 108-2923-E-009-003-MY3
Предметные рубрики: PLASMON
MODES
PHASE
ABSORPTION
RESONANCE
Аннотация: This numerical study demonstrates the possibility of exciting a chiral optical Tamm state localized at the interface between a cholesteric liquid crystal and a polarization-preserving anisotropic mirror conjugated to a metasurface. The difference of the proposed structure from a fully dielectric one is that the metasurface makes it possible to decrease the number of layers of a polarization-preserving anisotropic mirror by a factor of more than two at the retained Q-factor of the localized state. It is shown that the proposed structure can be used in a vertically emitting laser.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sokolov V. V., Malakhovskii A. V., Sukhachev A. L., Gudim I. A.
Заглавие : Magnetic circular dichroism and absorption of a HoAl3(BO3)4 crystal in the region of 5I8 → 5I3 and 5F2 transitions
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect.: Magnetotransport, magnetooptics and magnetophotonics. - Ст.D.P16. - P.470-471. - ISBN 978-5-94469-051-7
Примечания : Cited References: 4
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sidorenko M. S., Sergaeva O. N., Sadrieva Z. F., Roques-Carmes C., Muraev P. S., Maksimov D. N., Bogdanov A. A.
Заглавие : Observation of an accidental bound state in the continuum in a chain of dielectric dIsks
Место публикации : Phys. Rev. Appl. - 2021. - Vol. 15, Is. 3. - Ст.034041. - ISSN 23317019 (ISSN), DOI 10.1103/PhysRevApplied.15.034041
Примечания : Cited References: 58. - The authors acknowledge Almas Sadreev for fruitful discussions. M.D.N. acknowledges financial support from the Government of the Russian Federation through the ITMO Fellowship and Professorship Program and thanks ITMO University for hospitality. C.R.-C. acknowledges funding from the MIT MISTI-Russia Program. This work is supported by the Russian Foundation for Basic Research (Grants No. 19-02-00419 and No. 20-52-12062), the grant of the President of the Russian Federation (MK-2224.2020.2), and the Foundation for the Advancement of Theoretical Physics and Mathematics BASIS
Аннотация: Being a general wave phenomenon, bound states in the continuum (BICs) appear in acoustic, hydrodynamic, and photonic systems of various dimensionalities. Here, we report the first experimental observation of an accidental electromagnetic BIC in a one-dimensional periodic chain of coaxial ceramic disks. We show that the accidental BIC manifests itself as a narrow peak in the transmission spectra of the chain placed between two loop antennas. We demonstrate a linear growth of the radiative quality factor of the BICs with the number of disks that is well described with the developed tight-binding model. We estimate the number of disks when the radiation losses become negligible in comparison to material absorption and, therefore, the chain can be considered as practically infinite. The presented analysis is supported by near-field measurements of the BIC profile. The obtained results provide useful guidelines for practical implementations of structures with BICs opening up horizons for the development of radio-frequency and optical metadevices.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tomilin F. N., Rogova A. V., Burakova L. P., Tchaikovskaya O. N., Avramov P. V., Fedorov D. G., Vysotski E. S.
Заглавие : Unusual shift in the visible absorption spectrum of an active ctenophore photoprotein elucidated by time-dependent density functional theory
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [20-04-00085]; NSFCNational Natural Science Foundation of China (NSFC) [19-54-53004]; Russian Ministry of Science and EducationMinistry of Education and Science, Russian Federation [0721-2020-0033]
Место публикации : Photochem. Photobiol. Sci. - 2021. - Vol. 20, Is. 4. - P.559-570. - ISSN 1474-905X, DOI 10.1007/s43630-021-00039-5. - ISSN 1474-9092(eISSN)
Примечания : Cited References: 61. - The ab initio quantum chemical calculations were funded by RFBR and NSFC as the research project No. 19-54-53004 and RFBR research project No. 20-04-00085. The development of structural atomistic model of berovin without calcium ions generated by the I-TASSER server was funded by project 0721-2020-0033 of the Russian Ministry of Science and Education
Аннотация: Active hydromedusan and ctenophore Ca2+-regulated photoproteins form complexes consisting of apoprotein and strongly non-covalently bound 2-hydroperoxycoelenterazine (an oxygenated intermediate of coelenterazine). Whereas the absorption maximum of hydromedusan photoproteins is at 460–470 nm, ctenophore photoproteins absorb at 437 nm. Finding out a physical reason for this blue shift is the main objective of this work, and, to achieve it, the whole structure of the protein–substrate complex was optimized using a linear scaling quantum–mechanical method. Electronic excitations pertinent to the spectra of the 2-hydroperoxy adduct of coelenterazine were simulated with time-dependent density functional theory. The dihedral angle of 60° of the 6-(p-hydroxy)-phenyl group relative to the imidazopyrazinone core of 2-hydroperoxycoelenterazine molecule was found to be the key factor determining the absorption of ctenophore photoproteins at 437 nm. The residues relevant to binding of the substrate and its adopting the particular rotation were also identified.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Erratum to: Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals (Physics of the Solid State, (2021), 63, 1, (113-121), 10.1134/S1063783421010200)
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 3. - P.511. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421030203
Аннотация: Section Funding should read as follows: 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. 19-42-240003 “Influence of the local environment on magnetooptical properties of f-f transitions in rare-earth aluminum and iron borates” and the Russian Foundation for Basic Research, project No. 19-02-00034.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Likhatski M. N., Bayukov O. A., Knyazev Yu. V., Velikanov D. A., Tomashevich Y. V., Romanchenko A. S., Vorobyev S. A., Volochaev M. N., Zharkov S. M., Meira D. M.
Заглавие : Valleriite, a natural two-dimensional composite: X-ray absorption, photoelectron, and Mossbauer spectroscopy, and magnetic characterization
Место публикации : ACS Omega. - 2021. - Vol. 6, Is. 11. - P.7533-7543. - ISSN 24701343 (ISSN), DOI 10.1021/acsomega.0c06052
Примечания : Cited References: 92. - This research was supported by the Russian Science Foundation, project 18-17-00135. The authors thank Dr. Y. Laptev for providing valleriite samples, the ESRF for allocating beamtime and the BM23 staff for their help during the experiments. Facilities of the Krasnoyarsk Regional Research Equipment Centre of SB RAS were employed in the work
Аннотация: Valleriite is of interest as a mineral source of basic and precious metals and as an unusual material composed of two-dimensional (2D) Fe-Cu sulfide and magnesium hydroxide layers, whose characteristics are still very poorly understood. Here, the mineral samples of two types with about 50% of valleriites from Noril'sk ore provenance, Russia, were examined using Cu K- and Fe K-edge X-ray absorption fine structure (XAFS) spectroscopy, X-ray photoelectron spectroscopy (XPS), 57Fe Mossbauer spectroscopy, and magnetic measurements. The Cu K X-ray absorption near-edge structures (XANES) spectra resemble those of chalcopyrite, however, with a higher electron density at Cu+ centers and essentially differ from those of bornite Cu5FeS4; the Fe K-edge was less informative because of accompanying oxidized Fe-containing phases. The post-edge XANES and extended XAFS (EXAFS) analysis reveal differences in the bond lengths, e.g., additional metal-metal distances in valleriites as compared with chalcopyrite. The XPS spectra confirmed the Cu+ and Fe3+ state in the sulfide sheets and suggest that they are in electron equilibrium with (Mg, Al) hydroxide layers. Mossbauer spectra measured at room temperature comprise central doublets of paramagnetic Fe3+, which decreased at 78 K and almost disappeared at 4.2 K, producing a series of hyperfine Zeeman sextets due to internal magnetic fields arising in valleriites. Magnetic measurements do not reveal antiferromagnetic transitions known for bornite. The specific structure and properties of valleriite are discussed in particular as a platform for composites of the 2D transition metal sulfide and hydroxide (mono)layers stacked by the electrical charges, promising for a variety of applications.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P.113-121. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421010200
Примечания : Cited References: 21. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local en-vironment on magneto-optical properties of f–f transitions in rare-earth aluminum and iron borates”
Аннотация: The polarized optical absorption spectra in the region of a series of the f–f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/2 → 4G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.
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