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Nonlinear optical processes in randomized domain structures of strontium tetraborate / Aleksandrovsky A.S., Shakhura I.E., Vyunyshev A.M., Zaitsev A.I., Zamkov A.V. // International Conference "Laser Optics 2008" June 23-28, 2008, St.Petersburg, Russia, p.55

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Shakhura, I. E.; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Zaitsev, A. I.; Зайцев, Александр, Иванович; Zamkov, A. V.; Замков, Анатолий Васильевич
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    Infrared bound states in the continuum: random forest method / M. S. Molokeev, A. S. Kostyukov, A. E. Ershov [et al.] // Opt. Lett. - 2023. - Vol. 48, Is. 17. - P. 4460-4463, DOI 10.1364/OL.494629. - Cited References: 42. - Ministry of Science and Higher Education of the Russian Federation (FSRZ-2023-0006) . - ISSN 0146-9592. - ISSN 1539-4794
   Перевод заглавия: Инфракрасные связанные состояния в континууме: метод случайного леса
Кл.слова (ненормированные):
Field enhancement -- Infrared radiation -- Neural networks -- Refractive index -- Second harmonic generation -- Subwavelength gratings
Аннотация: In this Letter, we consider optical bound states in the continuum (BICs) in the infrared range supported by an all-dielectric metasurface in the form of subwavelength dielectric grating. We apply the random forest machine learning method to predict the frequency of the BICs as dependent on the optical and geometric parameters of the metasurface. It is found that the machine learning approach outperforms the standard least square method at the size of the dataset of ≈4000 specimens. It is shown that the random forest approach can be applied for predicting the subband in the infrared spectrum into which the BIC falls. The important feature parameters that affect the BIC wavelength are identified.

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Держатели документа:
IRC SQC, Siberian Federal University, Krasnoyarsk, 660041, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen, 625003, Russia
Institute of Computational Modelling SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Kostyukov, A. S.; Ershov, A. E.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Gerasimov, V. S.; Polyutov, S. P.
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Size-selective optical trapping of nanoparticles with bound states in the continuum / A. S. Kostyukov, V. S. Gerasimov, A. E. Ershov [et al.] // Opt. Lasers Eng. - 2023. - Vol. 171. - Ст. 107797, DOI 10.1016/j.optlaseng.2023.107797. - Cited References: 46. - The work was supported by Russian Science Foundation Grant No. 22-12-00070 . - ISSN 0143-8166. - ISSN 1873-0302
Кл.слова (ненормированные):
Nanoparticles -- Bound states in the continuum -- Optical tweezers -- Optical trapping
Аннотация: We consider a waveguide with a symmetrically integrated silicon cylinder. This design supports a symmetry protected bound state in the continuum (BIC) with Q-factor controlled by slight displacement of the cylinder. When excited by a TE10 electromagnetic wave, the BIC leads to giant optical forces near the cylinder. These forces have a strong impact on nanoparticles being dragged by liquid flow over the waveguide as they approach the cylinder. At the same time, the nanoparticles perturb the resonant frequency of the BIC with a value proportional to their volume and proximity to the cylinder. Therefore, the interplay between the resonant width of the BIC and the nanoparticle frequency perturbation determines the positions of the nanoparticles trapped around the cylinder. This paradigm demonstrates resonant self-trapping and sorting of nanoparticles by size through BIC excitation. We highlight the extreme sensitivity of these effects to the frequency of the injected TE wave. Additionally, we show that these results remain valid when considering the finite conductivity of metal waveguides.

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Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Computational Modelling, SB RAS, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kostyukov, A. S.; Gerasimov, V. S.; Ershov, A. E.; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович
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Voltage-tunable Q factor in a photonic crystal microcavity / A. I. Krasnov, P. S. Pankin, D. S. Buzin [и др.] // Opt. Lett. - 2023. - Vol. 48, Is. 7. - P. 1666-1669, DOI 10.1364/OL.479431. - Cited References: 52. - The authors are grateful to Dmitrii N. Maksimov and Sergey A. Myslivets for fruitful discussions. The authors thank the Krasnoyarsk Regional Center of Research Equipment of FRC KSC SB RAS for providing the equipment. This study was supported by the Russian Science Foundation, project no. 22-22-00687 . - ISSN 0146-9592. - ISSN 1539-4794
Кл.слова (ненормированные):
Chemical vapor deposition -- Destructive interference -- Fano resonance -- Liquid crystals -- Photonic crystal cavities -- Q factor
Аннотация: A photonic crystal microcavity with a tunable quality factor (Q factor) has been implemented on the basis of a bound state in the continuum using the advanced liquid crystal cell technology platform. It has been shown that the Q factor of the microcavity changes from 100 to 360 in the voltage range of 0.6 V.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk 660041, Russia
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Siberian State University of Science and Technology, Krasnoyarsk 660037, Russia
AO NPP Radiosvyaz, Krasnoyarsk 660021, Russia

Доп.точки доступа:
Krasnov, A. I.; Краснов, Алексей Ильдарович; Pankin, P. S.; Панкин, Павел Сергеевич; Buzin, D. S.; Бузин, Даниил Сергеевич; Romanenko, G. A.; Романенко, Гавриил Александрович; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Zelenov, F. V.; Masyugin, A. N.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович
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Magnetic circular dichroism of Co nanoparticles localized in matrices of various types / Yu. Samoshkina, I. Edelman, H. Chou [et al.] // Materialia. - 2023. - Vol. 28. - Ст. 101759, DOI 10.1016/j.mtla.2023.101759. - 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 . - ISSN 2589-1529
Кл.слова (ненормированные):
Co nanoparticles -- SiO matrix -- ZnO matrix -- Magneto-optics -- Absorption
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Department of Physics, National Sun Yat-sen University, 80424 Kaohsiung, Taiwan
Department of Applied Physics, National University of Kaohsiung, 81148 Kaohsiung, Taiwan
Siberian Federal University, Krasnoyarsk, Russia
Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg, Russia
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center RAS, Kazan, Russia

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, Hsiung; Petrov, D. A.; Петров, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Neznakhin, Dmitry; Stepanova, Elena; Stepanov, Andrey
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Temperature and vibration OTDR measurements with a single mode-multimode-single mode fiber structure / A. Y. Igumenov, I. V. Melnikov, A. A. Afanasiev [et al.] // Proc. SPIE. - 2023. - Vol. 12372: Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII 2023 (28 - 30 January 2023, San Francisco, California, United States) Conference code: 187531. - Ст. 123720P, DOI 10.1117/12.2646114. - Cited References: 31
Кл.слова (ненормированные):
fiber optics -- fiber sensors -- reflectometry of optical fibers -- multimode interference
Аннотация: We suggest a prototype of a fiber-optic sensor system that is based on a simple singlemode-multimode-singlemode fiber structure and serial OTDR. The sensor has simple structure, made of affordable components, exploits easy measuring principle, immunes to EMI or RFI, and has confident response to measure key environment variables at a very long span. From the experimental results, the relationship between the temperature of water and output signal of the temperature sensor can be determined. After some maths, we can determine the temperature of the water by measuring the optical power loss of the at the SMS structure in a temperature range of 30 to 70 °C. This SMS structure is shown to carry out vibration measurement for 0.1-60 Hz frequencies with high accuracy. The OTDR exploited allows carrying out far-field measurements when SMS structure is spliced in long fiber-optic link.

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Держатели документа:
Moscow Institute of Physics and Technology, 9 Institutsky, Dolgoprudny, 141701, Russian Federation
T8 LLC, 44/1 Krasnobogatyrskaya, Moscow, 107076, Russian Federation
M. V. Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russian Federation
L. V. Kirensky Institute of Physics SB RAS, 50/38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
LLC 'Scientific and Production Company 'Spetstechnauka', 67 Chernyshevsky, Krasnoyarsk, 660000, Russian Federation

Доп.точки доступа:
Igumenov, A. Y.; Melnikov, I. V.; Afanasiev, A. A.; Popova, S. S.; Lukinykh, S. N.; Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications(23 ; 28 - 30 January 2023 ; San Francisco, California, United States)
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Synthesis and optical properties of nickel-doped copper metaborate crystals / A. D. Molchanova, E. M. Moshkina, M. S. Molokeev [et al.] // Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P. 717-722, DOI 10.1134/S0030400X23060127. - Cited References: 18. - The study was performed with the support of Russian Science Foundation, RSF grant no. 19-12-00413 . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
3d-ions -- crystal growth -- optical spectroscopy -- magnetic ordering -- cuprates
Аннотация: This work presents information on the growth and spectroscopic study of single crystals of copper metaborate doped with nickel Cu1–xNixB2O4 (x = 0.05, 0.1). In the absorption spectra of both crystals, satellites related to Cu centers distorted by impurity Ni atoms were observed near the lines of zero phonon transitions. Polarization studies in the isotropic ab-plane of the tetragonal crystal Cu1–xNixB2O4 show the presence of linear magnetic dichroism in the magnetically ordered state, which was previously observed both in manganese-doped and undoped copper metaborates CuB2O4. The temperature of magnetic phase transitions into the collinear antiferromagnetic and into helicoidal structures, TN = 19.1 K and T * = 8.6 K, respectively, were determined from the temperature dependence of the dichroic signal.

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Публикация на русском языке Синтез и оптические свойства кристаллов метабората меди, легированного никелем [Текст] / А. Д. Молчанова, Е. М. Мошкина, М. С. Молокеев [и др.] // Оптика и спектроскопия. - 2022. - Т. 130 Вып. 1. - С. 111-115

Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840, Moscow, Troitsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Scientific and Innovation Department, Kemerovo State University, 650000, Kemerovo, Russia

Доп.точки доступа:
Molchanova, A. D.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Tropina, E. V.; Bovina, A. F.; Бовина, Ася Федоровна; Boldyrev, K. N.
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Chukalina, E. P.
Study of the magnetic properties of neodymium and samarium iron borates by the method of erbium spectroscopic probe / E. P. Chukalina, A. Jablunovskis, I. A. Gudim // Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P. 630-636, DOI 10.1134/S0030400X23060024. - Cited References: 30. - This paper was carried out under financial support of the Russian Science Foundation (grant № 19-12-00413) . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
multiferroics -- optical spectroscopy -- crystals with rare earths -- Kramers ions
Аннотация: Iron borates NdFe3(BO3)4 and SmFe3 (BO3)4 activated with 1% erbium, with ahuntite structure (space symmetry group R32) were investigated by the method of erbium spectroscopic probe. From an analysis of the temperature dependence of the transmission spectra in the region of the 4I15/2 → 4113/2 transition in the Er3+ ion, it was found that both studied compounds order antiferromagnetically at TN ≈ 33 K into an easy-plane magnetic structure. No other phase transitions were found.

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Публикация на русском языке Чукалина Е. П. Исследование магнитных свойств ферроборатов неодима и самария методом спектроскопического эрбиевого зонда [Текст] / Е. П. Чукалина, А. Яблуновский, И. А. Гудим // Опт. и спектроскоп. - 2022. - Т. 130 Вып. 1. - С. 104-110

Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia
Moscow Institute of Physics and Technology (National Research University), 141701, Dolgoprudny, Moscow oblast, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Jablunovskis, A.; Gudim, I. A.; Гудим, Ирина Анатольевна
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Karavayskiy, A. Yu.
Influence of dielectric relaxations of soil water on the temperature dependence of soil permittivity / A. Yu. Karavayskiy, Yu. I. Lukin // Opt. Spectrosc. - 2023. - Vol. 131, Is. 12. - P. 1190-1199, DOI 10.1134/S0030400X24700206. - Cited References: 23. - This work was supported by the Russian Science Foundation and the Krasnoyarsk Regional Fund of Science and Technology Support within the framework of scientific project no. 22-27-20112 . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
permittivity -- mineral soil -- soil moisture -- bound water -- Maxwell–Wagner effect
Аннотация: Using a generalized refractive mixture dielectric model, the influence of the relative permittivity spectra of bound and unbound water in mineral soil on the nature of the temperature dependence of the relative permittivity of natural mineral soil, with a clay fraction content of 41.3%, was studied in the electromagnetic field frequency range from 50 MHz to 15 GHz. The causes of the emergence of intersections in the relative permittivity spectra of mineral soil, obtained at different temperatures but for a sample of the same moisture content, have been studied. It has been proved that the emergence of such an intersection point in the frequency range up to 1.5 GHz is due to the Maxwell–Wagner effect in bound water. The dependences of the frequency of the intersection point of the relative permittivity spectra of mineral soil on the temperature and volumetric content of bound and unbound water have been studied.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Lukin, Y. I.; Лукин, Юрий Иванович; Каравайский, Андрей Юрьевич
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10.

Phase diagram and soft modes behavior TbFe3–xGax(BO3)4 solid solutions with huntite structure / A. S. Krylov, A. N. Vtyurin, I. A. Gudim [et al.] // Opt. Spectrosc. - 2023. - Vol. 131, Is. 9. - P. 840-848, DOI 10.1134/S0030400X23070081. - Cited References: 40. - The authors are grateful to the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Science Foundation for funding within the framework of the scientific project, grant no. 20-42-240009 r_a_Krasnoyarsk, as well as the Russian Foundation for Basic Research and the German Scientific Research Community (Deutsche Forschungsgemeinschaft) for financial support within the project no. 21-52-12018 NNIO_a . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
Raman spectroscopy -- temperature dependence -- soft modes -- ferroborates -- phase diagramm
Аннотация: The Raman spectra of four crystals of TbFe3–xGax(BO3)4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed.

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Публикация на русском языке Фазовая диаграмма и особенности поведения мягких мод в твердых растворах со структурой хантита TbFe3-xGax(BO3)4 [Текст] / А. С. Крылов, А. Н. Втюрин, И. А. Гудим [и др.] // Опт. и спектроскоп. - 2022. - Т. 130 Вып. 1. - С. 84-91

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Federal Research Center KSC SB, Russian Academy of Sciences, “Krasnoyarsk Scientific Center of the Siberian Branch of RAS”, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Nemtsev, I. V.; Немцев, Иван Васильевич; Krylova, S. N.; Крылова, Светлана Николаевна
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