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Quasi-bound states in the continuum with temperature-tunable Q factors and critical coupling point at Brewster's angle / B.-R. Wu, J.-H. Yang, P. S. Pankin [et al.] // Laser Photon. Rev. - 2021. - Vol. 15, Is. 5. - Ст. 2000290, DOI 10.1002/lpor.202000290. - Cited References: 35. - This work was supported by the Higher Education Sprout Project of National Chiao Tung University and Ministry of Education and the Ministry of Science and Technology (NMOST-107-2221-E-009-046-MY3; 108-2923-E-009-003-MY3; 109-2224-E-009-002; and 109-2628-E-009-007-MY3). The research was also funded by Russian Foundation for Basic Research projects No. 19-52-52006 . - ISSN 1863-8880
Кл.слова (ненормированные):
bound state in the continuum -- Brewster resonance -- distributed Bragg reflector -- liquid crystal -- optical anisotropy -- Q factor
Аннотация: Quasibound state in the continuum (quasi-BIC) is a long-lived state with a high quality factor (Q factor). Here quasi-BICs in nematic liquid crystal (LC) layer embedded between a distributed Bragg reflector (DBR) and a metal layer are studied. First, a special class of true BICs between the DBR and the metal film with field localization provided by the Brewster transverse electric (TE) reflection in the DBR is experimentally demonstrated. It is demonstrated that the Q factor of the quasi-BIC can be tuned by the LC optical axis rotation in a wide range being only restricted by metal losses. The change of coupling with the radiation channel leads to a critical coupling condition, providing a total absorption of incident light. The acquired quasi-BIC resonance is extremely sensitive to the temperature due to the narrow nematic temperature range of the LC. The quasi-BIC transforms to BIC at the LC-isotropic clearing point, due to closing of the radiation channel.

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Держатели документа:
Institute of Imaging and Biomedical Photonics and Institute of Photonic System, National Chiao Tung University and National Yang Ming Chiao Tung University, 301 Gaofa 3rd Road, Tainan, 71150, Taiwan
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Wu, B. -R.; Yang, J. -H.; Pankin, P. S.; Панкин, Павел Сергеевич; Huang, C. -H.; Lee, W.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Chen, K. -P.
}
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Malakhovskii, A. V.
Magnetic circular dichroism of 5I8→ 5F3, 5F2 and 3K8 transitions in Na0.4Ho0.6F2.2 single crystal / A. V. Malakhovskii, V. V. Sokolov, D. N. Karimov // Opt. Mater. - 2021. - Vol. 114. - Ст. 110953, DOI 10.1016/j.optmat.2021.110953. - Cited References: 23. - A.V. Malakhovskii and V.V. Sokolov acknowledge the financing of the reported study by the Russian Foundation for Basic Researches grant 19-02-00034 and by the 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 environment on magneto-optical properties of f-f transitions in rare-earth aluminum and iron borates.” D.N. Karimov acknowledges the financing support by the Ministry of Science and Higher Education of Russia within the State assignment FSRC «Crystallography and Photonics» of Russian Academy of Sciences . - ISSN 0925-3467
Кл.слова (ненормированные):
Magnetic circular dichroism -- f-f transitions -- Fluoride crystals Ho3+ ions
Аннотация: We measured optical absorption and magnetic circular dichroism spectra of Na0.4Ho0.6F2.2 single crystal in the region of 5I8→ 5F3, 5F2 and 3K8 transitions in Ho3+ ion at 90 K and room temperature. Paramagnetic magneto-optical activities (MOA) of the transitions were found for these two temperatures and compared with the theory based on the nature of f-f transitions allowance. It was shown that nature of allowance of three considered transitions is different. The MCD spectra were also analyzed in approximation of the |J, ±MJ› wave functions of the free atom and using concept of the crystal quantum number. Using this concept and experimental paramagnetic MOA, we found that MJeff = 2.1 for the initial state of the 5I8→ 5F3 transition.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Federal Scientific Research Centre «Crystallography and Photonics» of Russian Academy of Sciences, Leninskiy Prospekt 59, Moscow, 119333, Russian Federation

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Karimov, D. N.; Малаховский, Александр Валентинович
}
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Critical coupling vortex with grating-induced high Q-factor optical Tamm states / R. G. Bikbaev, D. N. Maksimov, P. S. Pankin [et al.] // Opt. Express. - 2021. - Vol. 29, Is. 3. - P. 4672-4680, DOI 10.1364/OE.416132. - Cited References: 54. - Funding. Ministry of Science and Technology, Taiwan (108-2923E-009-003-MY3); Russian Foundation for Basic Research (19-52-52006); Council on grants of the President of the Russian Federation (MK-46.2021.1.2) . - ISSN 1094-4087
Кл.слова (ненормированные):
Angle of Incidence -- Bound state -- Coupled mode theory -- Critical coupling -- Dielectric grating -- High Q-factor -- Reflectance amplitudes -- Reflection amplitude
Аннотация: We investigate optical Tamm states supported by a dielectric grating placed on top of a distributed Bragg reflector. It is found that under certain conditions the Tamm state may become a bound state in the continuum. The bound state, in its turn, induces the effect of critical coupling with the reflectance amplitude reaching an exact zero. We demonstrate that the critical coupling point is located in the core of a vortex of the reflection amplitude gradient in the space of the wavelength and angle of incidence. The emergence of the vortex is explained by the coupled mode theory.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Imaging and Biomedical Photonics, National Chiao Tung University, Tainan, 71150, Taiwan

Доп.точки доступа:
Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Pankin, P. S.; Панкин, Павел Сергеевич; Chen, K. -P.; Timofeev, I. V.; Тимофеев, Иван Владимирович
}
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    Li/Na substitution and Yb3+ co-doping enabling tunable near-infrared emission in LiIn2SbO6:Cr3+ phosphors for light-emitting diodes / G. Liu, T. Hu, M. S. Molokeev, Z. Xia // iScience. - 2021. - Vol. 24, Is. 4. - Ст. 102250, DOI 10.1016/j.isci.2021.102250. - Cited References: 45. - The present work was supported by the National Natural Science Foundation of China of China (Grant Nos. 51972118 and 51961145101), the Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science & Technology Project (202007020005), the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Pro-gram (2017BT01X137), and RFBR according to the research project No. 19-52-80003 . - ISSN 2589-0042
   Перевод заглавия: Замещение Li/Na и содопирование Yb3+, позволяющее настраивать излучение в ближней инфракрасной области в люминофорах LiIn2SbO6: Cr3+ для светоизлучающих диодов
Кл.слова (ненормированные):
Inorganic Chemistry -- Optical Materials -- Photonics
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) has great potential in non-invasive detection, while the discovery of tunable broadband NIR phosphor still remains a challenge. Here, we report that Cr3+-activated LiIn2SbO6 exhibits a broad emission band ranging from 780 to 1400 nm with a full width at half maximum (FWHM) of 225 nm upon 492 nm excitation. The emission peaks are tuned from 970 to 1020 nm together with considerable broadening of FWHM (∼285 nm) via Li/Na substitution. Depending on Yb3+ co-doping, a stronger NIR fluorescence peak of Yb3+ appears with improved thermal resistance, which is ascribed to efficient energy transfer from Cr3+ to Yb3+. An NIR pc-LED package has been finally designed and demonstrated a remarkable ability to penetrate pork tissues (∼2 cm) so that the insertion depth of a needle can be observed, indicating that the phosphor can be applied in non-destructive monitoring.

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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation

Доп.точки доступа:
Liu, G.; Hu, T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.
}
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    Synthesis, structure, melting and optical properties of three complex orthorhombic sulfides BaDyCuS3, BaHoCuS3 and BaYbCuS3 / N. O. Azarapin, V. V. Atuchin, N. G. Maximov [et al.] // Mater. Res. Bull. - 2021. - Vol. 140. - Ст. 111314, DOI 10.1016/j.materresbull.2021.111314. - Cited References: 60. - This study was supported by the Russian Science Foundation (19-42-02003). The authors would like to thank Alexey A. Lubin for his studies on SEM. The studies were carried out on the basis of laboratory of electron and probe microscopy in REC ‘Nanotechnologies’. This work was partially supported by the DST-RSF project under the India-Russia Programme of Cooperation in Science and Technology (No. DST/ INT/RUS/RSF/P-20 dated May 16, 2019). Shaibal Mukherjee would like to thank MeitY for the YFRF under the Visvesvaraya Ph.D. Scheme for Electronics and IT. This publication is an outcome of the R&D work undertaken in the project under the Visvesvaraya Ph.D. Scheme of MeitY being implemented by Digital India Corporation (formerly Media Lab Asia). We are grateful to the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center «Krasnoyarsk Science Center SB RAS» for the provided equipment . - ISSN 0025-5408
   Перевод заглавия: Синтез, строение, плавление и оптические свойства трех сложных орторомбических сульфидов BaDyCuS3, BaHoCuS3 и BaYbCuS3
Кл.слова (ненормированные):
Complex sulfides -- Crystal structure -- SEM -- Raman -- Melting point
Аннотация: Complex sulfides BaDyCuS3, BaHoCuS3 and BaYbCuS3 were synthesized in a flow of sulfiding gases (CS2, H2S) at 900°C from standard solutions of lanthanide and copper nitrates, as well as from the same standard Ba(OH)2 solution. The crystal structures of BaDyCuS3, BaHoCuS3 and BaYbCuS3 were obtained by the Rietveld refinement method. All three compounds crystallize in the Cmcm space group (KZrCuS3 structural type) as predicted by the tolerance factor analysis. Their micromorphological, thermal and spectroscopic properties are evaluated. BaDyCuS3 and BaHoCuS3 melt congruently at 1376.5 °C and 1363.8 °C. BaYbCuS3 melts incongruently at 1353.3 °C. The optical band gap is 2.45 eV for BaDyCuS3, 2.37 eV for BaHoCuS3 and 1.82 eV for BaYbCuS3. The low bandgap of BaYbCuS3 is explained by the charge transfer band of Yb at the bottom of conduction band. The vibrational parameters of BaDyCuS3, BaHoCuS3 and BaYbCuS3 crystals were determined with the use of Raman and Infrared spectroscopies.

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Держатели документа:
Institute of Chemistry, Tyumen State University, Tyumen, 625003, Russian Federation
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk, 630090, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660049, Russian Federation
Laboratory of Coherent Optics, Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Hybrid Nanodevice Research Group (HNRG), Electrical Engineering and Centre for Advanced Electronics (CAE), Indian Institute of Technology IndoreMadhya Pradesh 453552, India
Laboratory of the Chemistry of Rare Earth Compounds, Institute of Solid State Chemistry, UB RAS, Ekaterinburg, 620137, Russian Federation

Доп.точки доступа:
Azarapin, N. O.; Atuchin, V. V.; Maximov, N. G.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Shestakov, N. P.; Шестаков, Николай Петрович; Krylov, A. S.; Крылов, Александр Сергеевич; Burkhanova, T. M.; Mukherjee, S.; Andreev, O. V.
}
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Optical and magnetic properties of the DyxCo1-x/Bi/Py trilayers / N. N. Kosyrev, V. Y. Yakovchuk, G. S. Patrin [et al.] // Tech. Phys. Lett. - 2021. - Vol. 47, Is. 2. - P. 107-110, DOI 10.1134/S1063785021020097. - Cited References: 14. - This study was supported by the Russian Foundation for Basic Research, project no. 18-02-00161-a . - ISSN 1063-7850. - ISSN 1090-6533

РУБ Physics, Applied

Кл.слова (ненормированные):
exchange coupling -- magnetic springs -- ellipsometry -- magnetooptical Kerr effect
Аннотация: We report on the results of investigations of the optical and magnetooptical properties of DyxCo1 -x/Bi/Py (Py is permalloy) trilayers. The temperature dependence of the magnetization has been examined using the magnetooptical Kerr effect and the optical refractive and absorption indices have been measured by spectral ellipsometry. It is shown that the thickness of the bismuth spacer affects the exchange coupling between the permalloy and DyCo layers, which manifests itself in the change in the magnetization compensation temperature and in the character of the exchange coupling.

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Публикация на русском языке Оптические и магнитные свойства трехслойных систем DyxCo1-x/Bi/Py [Текст] / Н. Н. Косырев, В. Ю. Яковчук, Г. С. Патрин [и др.] // Письма в Журн. техн. физ. - 2021. - Т. 47 Вып. 3. - С. 7-10

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Krasnoyarsk State Agr Univ, Achinsk Branch, Krasnoyarsk Krai 662150, Achinsk, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Kosyrev, N. N.; Косырев, Николай Николаевич; Yakovchuk, V. Yu.; Яковчук, Виктор Юрьевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Komarov, V. A.; Комаров, Василий Андреевич; Volchenko, E. N.; Tarasov, I. A.; Тарасов, Иван Анатольевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00161-a]
}
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High-resolution optical spectroscopy, magnetic properties, and single-crystal neutron diffraction of multiferroic HoFe3(BO3)4: Magnetic structure / M. N. Popova, E. P. Chukalina, D. A. Erofeev [et al.] // Phys. Rev. B. - 2021. - Vol. 103, Is. 9. - Ст. 094411, DOI 10.1103/PhysRevB.103.094411. - Cited References: 65. - Financial support of the Russian Science Foundation under Grant No. 19-12-00413 is acknowledged. I.V.G. acknowledges financial support of the neutron scattering studies from the Russian Foundation for Basic Research under Grant No. 20-02-00109. The analysis of the measured neutron diffraction data was performed by A.A.M. with support of the Russian Science Foundation under Grant No. 16-12-10531 . - ISSN 2469-9950
Кл.слова (ненормированные):
Antiferromagnetic structures -- Elastic neutron scattering -- High-resolution spectroscopy -- Magnetic susceptibility tensors -- Magnetoelectric properties -- Neutron diffraction measurements -- Single-crystal neutron diffraction -- Temperature dependencies
Аннотация: The magnetic structure is usually determined by the neutron diffraction measurements. However, in the case of complex multisublattice magnetics, this method fails to give an unambiguous result. Here, on the example of multiferroic HoFe3(BO3)4, we show that in the case of rare-earth (RE) compounds the right magnetic structure can be determined by additionally using optical spectroscopy and a theoretical analysis based on spectroscopic data. HoFe3(BO3)4 demonstrates a series of phase transitions and interesting magnetic and magnetoelectric properties. The available information on the magnetic structure of the compound, necessary for understanding and utilizing these properties, is contradictory. To resolve the existing ambiguities, we apply a combined approach. The high-resolution spectroscopy data deliver a set of the Ho3+ crystal-field (CF) levels in the paramagnetic and both easy-plane and easy-axis magnetic phases. These data are used to determine CF and Ho3+-Fe3+ exchange parameters and, then, to calculate the temperature dependencies of the magnetic susceptibility tensor of HoFe3(BO3)4. Based on these calculations, we suggest an easy-plane antiferromagnetic structure with a collinear arrangement of the Fe spins along the a axis and induced noncolinear moments of magnetically nonequivalent Ho ions. The suggested structure is further confirmed by single-crystal elastic neutron scattering experiments. We argue that specific features of the magnetic properties of RE iron borates isostructural to HoFe3(BO3)4 are governed by the energy patterns and the symmetry properties of the wave functions of the lower CF levels of the RE ground multiplet in the crystal field of the C2 symmetry.

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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Moscow, Troitsk, 108840, Russian Federation
L. V. Kirensky Institute of Physics, Siberian Branch of Ras, Krasnoyarsk, 660036, Russian Federation
National Research Center "kurchatov Institute", B.P. Konstantinov Petersburg Nuclear Physics Institute, Gatchina, 188300, Russian Federation
Laboratoire Leon Brillouin, CEA-CNRS, CE-Saclay, Gif-sur-Yvette, 91191, France
Prokhorov General Physics Institute, Ras, Moscow, 119991, Russian Federation
Kazan Federal University, Kazan, 420008, Russian Federation

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Erofeev, D. A.; Gudim, I. A.; Гудим, Ирина Анатольевна; Golosovsky, I. V.; Gukasov, A.; Mukhin, A. A.; Malkin, B. Z.
}
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    Eu2+ stabilized at octahedrally coordinated Ln3+ site enabling red emission in Sr3LnAl2O7.5 (Ln = Y or Lu) phosphors / T. Hu, Y. Gao, M. S. Molokeev [et al.] // Adv. Opt. Mater. - 2021. - Vol. 9, Is. 9. - Ст. 2100077, DOI 10.1002/adom.202100077. - Cited References: 25. - The work was supported from the National Natural Science Foundations of China (Grant Nos. 51972118, 51961145101, and 51722202), the Fundamental Research Funds for the Central Universities (D2190980), the Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01x137), and RFBR according to the research project (19-52-80003) . - ISSN 2195-1071
   Перевод заглавия: Eu2+, стабилизированный в октаэдрически координированной позиции Ln3+, обеспечивающий красную эмиссию в люминофоре Sr3LnAl2O7,5 (Ln = Y или Lu)

РУБ Materials Science, Multidisciplinary + Optics

Кл.слова (ненормированные):
Eu2+ -- photoluminescence -- red phosphor -- site occupancy
Аннотация: Red spectrum loss in phosphor-converted light-emitting diodes (pc-LEDs) restricts high-quality warm-white lighting. Herein, two blue-light excitable red-emitting Sr3LnAl2O7.5:Eu (Ln = Y or Lu) phosphors are reported, and red emission originating from an unprecedented substitution model, with Eu2+ occupied sixfold octahedrally coordinated lanthanide (Ln3+) sites is demonstrated. Site occupancy identification reveals that three different sites are occupied by Eu2+ and one distinct site is occupied by Eu3+, and the Eu2+ stabilized at Ln3+ site accompanied by Eu3+ selectively occupies at Sr2+ site as a charge compensator. An anomalous prolonged Eu2+-photoluminescence decay emission with increasing temperature in the low-temperature region is demonstrated. This accounts for the trapped electrons, which are thermally released from shallow traps and eventually populate the Eu2+ 5d level to form an excited-state Eu2+. The findings help better understand Eu2+ occupancy and luminescence. These also provide a new perspective for the exploration of novel Eu2+ activated oxide-based red phosphor for pc-LEDs.

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Держатели документа:
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt, Guangzhou 510641, Guangdong, Peoples R China.
Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Hu, Tao; Gao, Yan; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo; Zhang, Qinyuan
}
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Thermo-optic refraction in MoS2 medium for “Normally on” all optical switch / P. P. Shetty, M. Babu, D. N. Maksimov, J. Bingi // Opt. Mater. - 2021. - Vol. 112. - Ст. 110777, DOI 10.1016/j.optmat.2020.110777. - Cited References: 25. - Authors acknowledge the funding support from DST India under INT/RUS/RFBR/P-262 . - ISSN 0925-3467
Кл.слова (ненормированные):
Thermal lensing -- Optical modulation -- 2D nanomaterials -- All optical switch -- Thermal lens spectroscopy -- Thermal lensing
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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Держатели документа:
Bio-inspired Research and Development (BiRD) Laboratory, Photonic Devices and Sensors (PDS) Laboratory, Indian Institute of Information Technology Design and Manufacturing (IIITDM), Kancheepuram, Chennai, 600127, India
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Shetty, P. P.; Babu, M.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Bingi, J.
}
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10.

Refractive index sensing with optical bound states in the continuum / D. N. Maksimov, V. S. Gerasimov, S. Romano, S. P. Polyutov // Opt. Express. - 2020. - Vol. 28, Is. 26. - P. 38907-38916, DOI 10.1364/OE.411749. - Cited References: 56. - The research was supported by the Ministry of Science and High Education of Russian Federation, project no. FSRZ-2020-008. DNM is grateful to Andrey A. Bogdanov for useful discussion . - ISSN 1094-4087
Кл.слова (ненормированные):
Optical constants -- Optics -- Analytic formula -- Bound state -- Dielectric grating -- Differential sensitivity -- Figure of merits -- Optimisation designs -- Perturbative approach -- Refractive index sensing
Аннотация: We consider refractive index sensing with optical bounds states in the continuum (BICs) in dielectric gratings. Applying a perturbative approach we derived the differential sensitivity and the figure of merit of a sensor operating in the spectral vicinity of a BIC. Optimisation design approach for engineering an effective sensor is proposed. An analytic formula for the maximal sensitivity with an optical BIC is derived. The results are supplied with straightforward numerical simulations.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Computational Modeling SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Applied Sciences and Intelligent Systems, National Research Council, Naples, 80131, Italy

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Gerasimov, V. S.; Romano, S.; Polyutov, S. P.
}
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11.

    Single crystal growth and the electronic structure of Rb2Na(NO3)3: Experiment and theory / K. E. Korzhneva, V. L. Bekenev, O. Y. Khyzhun [et al.] // J. Solid State Chem. - 2021. - Vol. 294. - Ст. 121910, DOI 10.1016/j.jssc.2020.121910. - Cited References: 54. - This work was done on state assignment of IGM SB RAS, Ministry of Science and Higher Education of the Russian Federation; NSU BCH-2020-0036-4 (10988) (XRD analysis), and was supported by Russian Foundation for Basic Research (grants Nos. 18-32-00359 , 19-42-540012) . - ISSN 0022-4596
   Перевод заглавия: Рост монокристалла и электронная структура Rb2Na(NO3)3: эксперимент и теория
Кл.слова (ненормированные):
Double nitrates -- Crystal growth -- Electronic structure -- Nonlinear optical materials -- X-ray photoelectron spectroscopy
Аннотация: Rb2Na(NO3)3 crystals demonstrate nonlinear optical properties and can be used as a converter of laser radiation in the shortwave region. The crystals were grown in the present work by the Bridgman–Stockbarger method in a ratio of 75 wt%(RbNO3) and 25 wt%(NaNO3). After the growth, a transparent centimeter size single crystal (6 cm long) was obtained for the first time that is very important for its practical application. The unit cell volume of double Rb2Na(NO3)3 nitrate is intermediate between the cell volumes of simple rubidium and sodium nitrates, RbNO3 and NaNO3. Electronic structure of Rb2Na(NO3)3 was studied in the present work from both experimental and theoretical viewpoints. In particular, employing X-ray photoelectron spectroscopy, we have measured binding energies of core electrons and energy distribution of the electronic states within the valence band region of the Rb2Na(NO3)3 crystal and established rather big binding energies for N 1s and O 1s core-level electrons. The bombardment of middle-energy Ar+ ions induces transformation of some nitrogen atoms of the analyzing topmost layers of the Rb2Na(NO3)3 crystal surface from the NO3– group to the NO2– group. To explore in detail the filling of the valence band of Rb2Na(NO3)3 by electronic states associated with constituting atoms, we use first-principles calculations within a density functional theory (DFT) framework. The DFT calculations reveal that O 2p states are the principal contributors to the valence band bringing the main input in its upper portion. The theoretical finding is supported experimentally by fitting the X-ray photoelectron valence band spectrum and the X-ray emission O Kα band on the total energy scale. The conduction band bottom of Rb2Na(NO3)3 is composed by unoccupied O 2p and N 2p states in almost equal proportion.

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Novosibirsk State University, Novosibirsk, 630090, Russian Federation
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk, 630090, Russian Federation
Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky StreetKyiv UA-03142, Ukraine
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Korzhneva, K. E.; Bekenev, V. L.; Khyzhun, O. Y.; Goloshumova, A. A.; Tarasova, A. Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Isaenko, L. I.; Kurus, A. F.
}
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12.

    Хиральные оптические таммовские состояния на границе анизотропного зеркала и холестерика с красителем / А. Ю. Авдеева, С. Я. Ветров, М. В. Пятнов [и др.] // IX Международная конференция по фотонике и информационной оптике : сборник научных трудов. - 2020. - С. 91-92. - Библиогр.: 3. - Исследование выполнено при финансовой поддержке РФФИ, Правительства Красноярского края и ККФН в рамках научного проекта № 19 24 240004 . - ISBN 978-5-7262-2648-4
   Перевод заглавия: Chiral optical ta mm states at the interface between an anisotropic mirror and a cholesteric with dye
Аннотация: Изучен эффект расщепления хирального оптического таммовского состояния ( локализованного на границе сохраняющего поляризацию анизотропного зеркала (СПАЗ) и холестерического жидкого кристалла (ХЖК) с красителем. Показаны условия возникновения высокодобротных резонансов, проявляемых в спектре отражения в виде провалов, которые м огут быть использованы при создании узкополосных фильтров.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Сибирский федеральный университет

Доп.точки доступа:
Авдеева, Анастасия Юрьевна; Avdeeva, A. Yu.; Ветров, Степан Яковлевич; Vetrov, S. Ya.; Пятнов, Максим Владимирович; Pyatnov, M. V.; Рудакова, Наталья Викторовна; Rudakova, N. V.; Тимофеев, Иван Владимирович; Timofeev, I. V.; Международная конференция по фотонике и информационной оптике(9 ; 2020 ; янв. ; 29-31 ; Москва); Российская академия наук; Национальный исследовательский ядерный университет "МИФИ"; Государственная корпорация по атомной энергии "РОСАТОМ"
}
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13.

Optical and magneto-optical properties of epitaxial Mn2GaC MAX phase thin film / S. Lyaschenko, O. Maximova, D. Shevtsov [et al.] // J. Magn. Magn. Mater. - 2021. - Vol. 528. - Ст. 167803, DOI 10.1016/j.jmmm.2021.167803. - Cited References: 39. - The research was supported by the government of the Russian Federation (agreement No. 075-15-2019-1886) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 405553726 – TRR 270. We thank Andrejs Petruhins for preparation of the samples. J. R. acknowledges funding from the Swedish Research Council (VR), project 642-2013-8020 . - ISSN 0304-8853
Кл.слова (ненормированные):
MAX phases -- Magnetism -- Epitaxial thin films -- Spectral magneto-ellipsometry -- Magnetic circular dichroism
Аннотация: We report measurements of the dielectric permittivity, optical conductivity and magnetic circular dichroism (MCD) of the epitaxial Mn2GaC MAX-phase thin film in an external magnetic field of up to 200 mT, at temperatures of 296 and 140 K and 1.4 to 3.5 eV. The optical conductivity and MCD spectra show absorption peaks which are consistent with the interband electronic transitions for different positions of Mn, Ga, and C ions as confirmed by theoretical calculations of the spin-dependent density of electronic states. The well-known structural phase transition at 214 K is also seen in the changes of optical, magneto-optical and surface magnetic properties of Mn2GaC in our experiment.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Faculty of Physics, University of Duisburg-Essen, Duisburg, 47057, Germany
Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linkoping University, Linkoping, SE-581 83, Sweden

Доп.точки доступа:
Lyashchenko, S. A.; Лященко, Сергей Александрович; Maximova, O. A.; Максимова, Ольга Александровна; Shevtsov, D. V.; Шевцов, Дмитрий Валентинович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Tarasov, I. A.; Тарасов, Иван Анатольевич; Wiedwald, U.; Rosen, J.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Farle, M.
}
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14.

    Krakhalev, M. N.
    Point defects in nematic liquid crystal materials with conical anchoring at the interface / M. N. Krakhalev, V. F. Shabanov, V. Ya. Zyryanov // Sib. J. Sci. Technol. - 2020. - Vol. 21, Is. 3. - P. 433-440 ; Сибирский журнал науки и технологий, DOI 10.31772/2587-6066-2020-21-3-433-440. - Cited References: 25 . - ISSN 2587-6066
   Перевод заглавия: Точечные дефекты в нематических жидкокристаллических материалах с коническим сцеплением на границе раздела
Кл.слова (ненормированные):
topological defect -- orientational structure -- nematic liquid crystal -- optical phase difference -- топологический дефект -- ориентационная структура -- нематический жидкий кристалл -- оптическая разность фаз
Аннотация: The topological point defects in nematic liquid crystal materials have been studied. The method of oblique light incidence has been proposed to determine an azimuthal director angle of an achiral nematic as well as a chiral nematic (cholesteric). The idea of the method is based on the dependence of the optical phase difference between ordinary and extraordinary light beams on the azimuthal director angle at the layer center at oblique incidence of light on a structure in which the polar director angle of a nematic liquid crystal is not equal to 0° or 90° (conical boundary conditions). It has been shown that the phase difference reaches a maximum at a zero azimuthal angle at the center of the layer regardless of the total twist angle of the director. The developed method has been used to analyze topological defects formed in the nematic and cholesteric layers under conical boundary conditions at the interface. The director field distributions of nematic and cholesteric near the surface point defects (boojums) with topological charges m = +1 and m = –1 have been drawn based on the experimental data. The proposed method of oblique light incidence can be used to analyze a wide class of the achiral and chiral liquid crystal media of various types: smectics, nematics, and cholesterics with tilted or hybrid boundary conditions.
ГИсследованы топологические точечные дефекты в нематических жидкокристаллических материалах. Предложен метод наклонного падения света, позволяющий определять азимутальный угол директора ахирального нематика, а также закрученного нематика (холестерика). Суть метода состоит в том, что при наклонном падении света на структуру с отличным от 0° и 90° полярным углом директора нематического жидкого кристалла (конические граничные условия) оптическая разность фаз, возникающая между обыкновенным и необыкновенным лучами, определяется величиной азимутального угла директора в центре слоя. Показано, что максимальное значение разности фаз достигается при нулевом азимутальном угле в центре слоя независимо от полного угла закрутки директора. Разработанный метод был использован для анализа топологических дефектов, формирующихся в слоях нематика и холестерика с коническими граничными условиями на межфазной границе. На основании полученных экспериментальных данных были построены распределения поля директора нематика и холестерика вблизи поверхностных точечных дефектов (буджумов) с топологическими зарядами m = +1 и m = –1. Полученные результаты интересны для исследований структурированных материалов, анализа оптическими методами дефектов структур, а предложенный метод наклонного падения света может использоваться для анализа широкого класса ахиральных и хиральных жидкокристаллических сред различного типа: смектиков, нематиков и холестериков с наклонными или гибридными граничными условиями.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS; 50/38, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University; 79, Svobodny Av., Krasnoyarsk, 660041, Russian Federation
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”; 50, Akademgorodok St., Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Shabanov, V. F.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Крахалев, Михаил Николаевич

}
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15.

    Synthesis, structure, and properties of EuScCuS3 and SrScCuS3 / A. V. Ruseikina, M. S. Molokeev, V. А. Chernyshev [et al.] // J. Solid State Chem. - 2021. - Vol. 296. - Ст. 121926, DOI 10.1016/j.jssc.2020.121926. - Cited References: 72. - The work was supported by the Ministry of Science and Higher Education of the Russian Federation under Project No. FEUZ-2020-0054; by RFBR Grant 18-02-00754 ; by the “UMNIK” program research project № 14977GY/2019; by the Ministry of Science and Higher Education of the Russian Federation (contract no. 05.594.21.0019 , unique identification number RFMEFI59420X0019). Maxim S. Molokeev, Anton S. Tarasov and Mikhail V. Rautskii acknowledge additional funding from Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation. The subset research was performed in Research Resource Center “Natural Resource Management and Physico-Chemical Research.” The use of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center « Krasnoyarsk Science Center SB RAS» is acknowledged . - ISSN 0022-4596
   Перевод заглавия: Синтез, строение и свойства EuScCuS3 и SrScCuS3
Кл.слова (ненормированные):
Inorganic materials -- Thermochemistry -- Raman spectroscopy -- Magnetic measurements -- Optical spectroscopy -- X-ray diffraction -- Ab initio calculations
Аннотация: The crystal structures of the first-synthesized compound EuScCuS3 and previously known SrScCuS3 are refined by Rietveld analysis of X-ray powder diffraction data. The structures are found to belong to orthorhombic crystal system, space group Cmcm, structural type KZrCuS3, with a = 3.83413(3) Å, b = 12.8625(1) Å, c = 9.72654(8) Å (SrScCuS3) and a = 3.83066(8) Å, b = 12.7721(3) Å, c = 9.7297(2) Å (EuScCuS3). The temperatures and enthalpies of incongruent melting are the following: Тm = 1524.5 К, ΔHm = 21.6 kJ•mol−1 (SrScCuS3), and Тm = 1531.6 К, ΔHm = 26.1 kJ•mol−1 (EuScCuS3). Ab initio calculations of the crystal structure and phonon spectrum of the compounds were performed. The types and wavenumbers of fundamental modes were determined and the involvement of ions participating in the IR and Raman modes was assessed. The experimental IR and Raman spectra were interpreted. EuScCuS3 manifests a ferromagnetic transition at 6.4 K. The SrScCuS3 compound is diamagnetic. The optical band gaps were found to be 1.63 eV (EuScCuS3) and 2.24 eV (SrScCuS3) from the diffuse reflectance spectra. The latter value is in good agreement with that calculated by the DFT method. The narrower band gap of EuScCuS3 is explained by the presence of 4f-5d transition in Eu2+ ion that indicates a possibility to control the band gap of the chalcogenides by the inclusion of Eu. The activation energy of crystal structure defects, being the source of additional absorption in the NIR spectral range, was found to be 0.29 eV.

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Institute of Chemistry, University of Tyumen, Tyumen, 625003, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660079, Russian Federation
Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620002, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660049, Russian Federation
Institute of Physics and Technology, University of Tyumen, Tyumen, 625003, Russian Federation
Engineering Centre of Composite Materials Based on Tungsten Compounds and Rare-earth Elements, University of Tyumen, Tyumen, 625003, Russian Federation
University of Tyumen, Tyumen, 625003, Russian Federation

Доп.точки доступа:
Ruseikina, A. V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chernyshev, V. А.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Grigoriev, M. V.; Maximov, N. G.; Shestakov, N. P.; Шестаков, Николай Петрович; Garmonov, A. A.; Matigorov, A. V.; Tarasov, A. S.; Тарасов, Антон Сергеевич; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Khritokhin, N. А.; Melnikova, L. V.; Tretyakov, N. Y.
}
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16.

Methods to determine crystal lattice parameters of opal-like structures / I. V. Nemtsev, O. V. Shabanova, I. A. Tambasov [et al.] // J. Struct. Chem. - 2021. - Vol. 62, Is. 4. - P. 641-650, DOI 10.1134/S0022476621040168. - Cited References: 45. - The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme No. AAAA-A18-118041990041-8) . - ISSN 0022-4766
Кл.слова (ненормированные):
opal -- colloidal crystal -- stereoregularity -- poly(methyl methacrylate) -- dispersion medium -- photonic crystal structure -- optical spectroscopy -- Bragg diffraction -- electron microscopy
Аннотация: Series of high-quality spherical poly(methyl methacrylate) particles with a polydispersity less than 5% are prepared by chain-growth emulsifier-free controlled radical emulsion polymerization of methyl methacrylate in water. The average diameters in the series varied from 237 nm to 447 nm. The physico-chemical properties of obtained submicrospheres can be varied to make them more stable and stronger by a modified classical synthesis technology whereby 4-10 vol.% of dispersion medium is replaced by acetone. 2D and 3D photonic crystal structures, opals, are prepared from poly(methyl methacrylate) submicrospheres. The crystal structure of the opals is studied by IR spectroscopy and scanning electron microscopy. According to the spectroscopic data, the poly(methyl methacrylate) particles contain significant amounts of water whose evaporation leads to the shrinkage of the spheres. The stereoregularity of the synthesized polymer is studied, the glass-transition temperatures of obtained samples are determined.

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Публикация на русском языке Методы определения параметров кристаллической решетки опалоподобных структур [Текст] / И. В. Немцев, О. В. Шабанова, И. А. Тамбасов [и др.] // Журн. структ. химии. - 2021. - Т. 62 № 4. - С. 684-693

Держатели документа:
Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Special Designing and Technological Bureau “Nauka” Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Nemtsev, I. V.; Немцев, Иван Васильевич; Shabanova, O. V.; Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Ivanenko, A. A.; Иваненко, Александр Анатольевич; Cherepakhin, A. V.; Черепахин, Александр Владимирович; Shestakov, N. P.; Шестаков, Николай Петрович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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17.

Bulgakov, E. N.
Resonant binding of dielectric particles to a metal surface without plasmonics / E. Bulgakov, K. Pichugin, A. Sadreev // Phys. Rev. A. - 2021. - Vol. 103, Is. 5. - Ст. L051501, DOI 10.1103/PhysRevA.103.L051501. - Cited References: 36. - The work was supported by Russian Foundation for Basic Research Project No. 19-02-00055 . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
RADIATION PRESSURE
   OPTICAL BINDING
   FORCES
   MANIPULATION
Аннотация: A high index dielectric spherical particle supports the high-Q resonant Mie modes that result in a regular series of sharp resonances in the radiation pressure. The presence of a perfectly conducting metal surface transforms the Mie modes into extremely high-Q magnetic bonding or electric antibonding modes for the close approach of a sphere to a surface. We show that an electromagnetic plane wave with normal incidence results in repulsive or attractive resonant optical forces relative to a metal for the excitation of electric bonding or magnetic antibonding resonant modes, respectively. A magnitude of resonant optical forces reaches the order of 1 nN of magnitude for micron-sized silicon particles and a power of light 1mW/μm2 that exceeds the gravitational force by four orders. However, what is the most remarkable is there are steady positions for a sphere between the pulling and pushing forces that give rise to the resonant binding of the sphere to a metal surface.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич; Russian Foundation for Basic Research ProjectRussian Foundation for Basic Research (RFBR) [19-02-00055]
}
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18.

Avdeeva, A. Yu.
Splitting of a Tamm plasmon polariton at the interface between a metal and a resonant nanocomposite layer conjugated with a photonic crystal / A. Y. Avdeeva, S. Y. Vetrov, I. V. Timofeev // J. Opt. Soc. Am. B. - 2021. - Vol. 38, Is. 6. - P. 1792-1797, DOI 10.1364/JOSAB.420490. - Cited References: 36. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 19-42-240004 and by Russian Foundation for Basic Research, project No. 19-52-52006. The authors are thankful to Pavel S. Pankin for valuable discussions and comments . - ISSN 0740-3224
Кл.слова (ненормированные):
Dispersion equations -- Finite structures -- Frequency approach -- Nano-composite layers -- Plasmon-polaritons -- Reflectance spectrum -- Resonance frequencies -- Transparent matrix -- Metallic matrix composites
Аннотация: Splitting of a Tamm plasmon polariton at the interface between a metal and a nanocomposite layer conjugated with a photonic crystal (Bragg mirror) has been theoretically investigated. The splitting can be implemented when the Tamm plasmon polariton frequency approaches the resonance frequency of the nanocomposite, which consists of metallic nanoballs dispersed in a transparent matrix. The reflectance spectrum of the p-polarized waves at the normal incidence of light has been calculated. It has been established that the Tamm plasmon polariton splitting significantly depends on the concentration of nanoballs in the nanocomposite layer and its thickness. The solution of the dispersion equation derived for a sample with semi-infinite mirrors has been compared with the spectra obtained for a finite structure by the transfer matrix method.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Авдеева, Анастасия Юрьевна
}
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19.

Maximova, O. A.
Analytical calculation of dielectric permittivity tensor from magneto-optical ellipsometry measurements / O. Maximova, S. Ovchinnikov, S. Lyaschenko // J. Phys. A. - 2021. - Vol. 54, Is. 29. - Ст. 295201, DOI 10.1088/1751-8121/abfe72. - Cited References: 24. - This study was supported by the Government of the Russian Federation (Agreement No. 075-15-2019-1886) . - ISSN 1751-8113. - ISSN 1751-8121

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
FILMS
Кл.слова (ненормированные):
ellipsometry -- dielectric permittivity tensor -- ferromagnetics -- transverse magneto-optical Kerr effect
Аннотация: Magneto-optical ellipsometry combines ellipsometry and magneto-optical Kerr effect measurements which are two powerful techniques. The main difficulty is usually in data processing as a number of parameters should be extracted from measured ellipsometric (ψ, Δ) and magneto-ellipsometric (δψ, δΔ) parameters. Standard procedure of solving magneto-ellipsometry equations involves numerical calculations. In this paper we show that it is possible to find out all elements of dielectric permittivity tensor without numerical calculation methods. It means that the inverse problem of magneto-optical ellipsometry can be solved analytically in the case of expansion of magneto-ellipsometric parameters δψ and δΔ with respect to two small parameters. We present a full set of mathematical expressions that enable us to calculate complex refraction index and complex magneto-optical parameter of a sample from magneto-optical ellipsometry measurements, thereby obtaining diagonal and off-diagonal complex elements of dielectric permittivity tensor. This analytical approach can be used in case of the contribution from magnetism into reflection coefficients being small.

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Держатели документа:
Kirensky Inst Phys SB RAS, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Lyashchenko, S. A.; Лященко, Сергей Александрович; Максимова, Ольга Александровна; Government of the Russian Federation [075-15-2019-1886]
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20.

Plasmonic enhancement of local fields in ultrafine metal nanoparticles / L. K. Sorensen, A. D. Utyushev, V. I. Zakomirnyi [et al.] // J. Phys. Chem. C. - 2021. - Vol. 125, Is. 5. - P. 13900-13908, DOI 10.1021/acs.jpcc.1c01424. - Cited References: 65. - The work was supported by the Russian Science Foundation (project no. 18-13-00363). L.K.S acknowledges the support of Carl Tryggers Stifetelse, project CTS 18-441 . - ISSN 1932-7447
Кл.слова (ненормированные):
Crystal structure -- Electric fields -- Electromagnetic fields -- Metal nanoparticles -- Plasmonics -- Discrete interaction -- External fields -- High symmetry -- Metallic nanoparticles -- Nanoscale particles -- Near field imaging -- Optical response -- Plasmon field -- Plasmonic nanoparticles
Аннотация: We present an analysis of ultrafine metallic nanoparticles (1-15 nm) with respect to electromagnetic field generation by plasmonic excitations. A number of structures with different symmetries and geometries are studied in order to analyze the distributions of plasmonically generated near-electric fields and the concentration of hot and cold spots around the particles. The study is made possible by the recent development of an extended discrete interaction model (Ex-DIM) where the explicit dependency of the plasmonic spectra on the structure and composition of particles in the range of 1-15 nm is accounted for. With the Ex-DIM, the optical response of the internal crystal structure of the nanoscale particles can be visualized, thereby making it possible to predict the dependence of the generated local fields with respect to the position of the particles relative to the external field polarization. The results indicate rather surprising concentrations of the plasmon fields in very confined hot spots also in cases when the particles retain a high symmetry. The consequence of the findings of this study when using small symmetric nanoparticles for near-field imaging is briefly discussed.

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Держатели документа:
Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, SE-751 20, Sweden
Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, Stockholm, SE-10691, Sweden
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Computational Modelling, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
L. V. Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
Federal Siberian Research Clinical Centre under Fmba of Russia, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Sorensen, L. K.; Utyushev, A. D.; Zakomirnyi, V. I.; Gerasimov, V. S.; Ershov, A. E.; Polyutov, S. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Agren, H.
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