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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Chirkin A. S.
Заглавие : Cherenkov second harmonic generation of femtosecond laser pulses in a homogeneous nonlinear crystal
Место публикации : Laser Phys. - 2024. - Vol. 34, Is. 8. - Ст.085402. - ISSN 1054660X (ISSN), DOI 10.1088/1555-6611/ad5156. - ISSN 15556611 (eISSN)
Примечания : Cited References: 37
Аннотация: In experiments on second harmonic (SH) generation (SHG), a conical structure of radiation has been observed. In the present study, a non-stationary theory of SH excitation of ultrashort laser pulses with phase modulation has been developed, which explains the properties of such a structure as Cherenkov radiation. Under phase-mismatched interactions, a maximum of the SH spectrum is observed at the Cherenkov angle, which is determined by the ratio of the SH and laser radiation phase velocities. It is shown that tightly focused laser beams are preferred to observe Cherenkov SHG. The SH spectral width depends on the group velocity mismatch and is more complicated on the excited radiation spectrum. The SH energy can be proportional to the crystal length or group delay length depending on their ratio. We also demonstrate that a complex angular distribution of spectral components (an angular chirp) appears within the SH cross-section.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhestkij, Nikolaj A., Efimova, Anastasiia S., Kenzhebayeva, Yuliya, Dmitriev, Maksim V., Novikov, Alexander S., Yushina, Irina D., Krylov A. S., Timofeeva, Maria V., Kulakova, Alena N., Glebova, Nadezhda V., Krasilin, Andrei A., Shipilovskih, Sergey A., Milichko, Valentin A.
Заглавие : Nonlinear metal–organic framework crystals for efficient multicolor coherent optical emission
Колич.характеристики :8 с
Место публикации : Adv. Optical Mater. - 2023. - Vol. 11. Is. 22. - Ст.2300881. - ISSN 21951071 (eISSN), DOI 10.1002/adom.202300881
Примечания : Cited References: 56. - V.A.M. acknowledges the financial support from the Russian Science Foundation (optical part, Grant No: 22-72-10027 “Flexible hybrid materials as active layer in memory devices”) and the Priority 2030 Federal Academic Leadership Program. A.S.N. acknowledges the RUDN University Strategic Academic Leadership Program. S.A.S. acknowledges the financial support by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program and the Russian Science Foundation (chemical part, Grant No. 22-73-10069 “Design and application of flexible Metal organic frameworks for photonics devices”). The authors acknowledge the support by the Ministry of Science and Higher Education of the Russian Federation (Project No. 075-15-2021-589)
Аннотация: Abstract Non-centrosymmetric metal–organic frameworks (MOFs) have recently emerged as a promising class of coordination polymers for nonlinear optics and light conversion. Nevertheless, achieving high endurance and efficiency for the light conversion within the whole visible range by a single crystal of MOF remains a challenge. This article reports on the design of two non-centrosymmetric MOFs based on a 1,3,5-benzenetricarboxylic acid ligand and Er/Co ions, providing an efficient and simultaneous multiple second and third optical harmonic generations (SHG, THG) from 400 to 750 nm with a high endurance (over 100 cycles or 3 h of continuous operation). Optical experiments and quantum chemical modeling of the MOF single crystals confirm the polarization and chemistry-dependent efficiency of SHG and THG, associated with the varied MOFs' symmetry and dipole moment. The observed coherent light conversion within the whole visible range by MOF single crystals at ambient conditions makes it possible to achieve the multicolor (up to three) coherent emission required for modern laser technologies, making MOFs highly competitive and sustainable materials for nonlinear optics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molokeev M. S., Kostyukov A. S., Ershov A. E., Maksimov D. N., Gerasimov V. S., Polyutov S. P.
Заглавие : Infrared bound states in the continuum: random forest method
Колич.характеристики :4 с
Место публикации : Opt. Lett. - 2023. - Vol. 48, Is. 17. - P.4460-4463. - ISSN 01469592 (ISSN), DOI 10.1364/OL.494629. - ISSN 15394794 (eISSN)
Примечания : Cited References: 42. - Ministry of Science and Higher Education of the Russian Federation (FSRZ-2023-0006)
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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuznetsov S. A., Lapanik V. I., Lugouskiy A. A., Timofeev S. N., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Electrically-tunable reflectarrays for millimeter waves based on liquid-crystal-loaded high-impedance surfaces
Коллективы : "Terahertz and microwave radiation: generation, detection and applications", International conference, «Терагерцевое и микроволновое излучение: генерация, детектирование и приложения», конференции с международным участием, Национальный исследовательский ядерный университет МИФИ, Московский государственный университет им. М.В. Ломоносова, Национальный исследовательский центр "Курчатовский институт"
Место публикации : The 5-th International conference "Terahertz and microwave radiation: generation, detection and applications" (TERA-2023): abstract book. - Москва, 2023. - P.11
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova E.V., Sagatov N., Oreshonkov A. S., Gavryushkin P.N., Popov Z.I.
Заглавие : Novel Janus 2D structures of XMoY (X, Y = O, S, Se, Te) composition for solar hydrogen production
Место публикации : Int. J. Hydrog. Energy. - 2023. - Vol. 48, Is. 38. - P.14226-14237. - ISSN 03603199 (ISSN), DOI 10.1016/j.ijhydene.2022.12.286. - ISSN 18793487 (eISSN)
Примечания : Cited References: 97. - The authors acknowledge financial support from Russian Science Foundation (№ 21-73-20183). The authors are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences and to the Information Technology Centre of Novosibirsk State University for providing access to the cluster computational resources
Аннотация: The successful fabrication of H-phase Janus transition metal dichalcogenides (TMDs) has received considerable interest due to its great potential in photocatalytic applications. Here, new A′-XMoY (X/Y = O, S, Se, Te) Janus-type structures belonging to the family of TMDs were theoretically investigated for the first time in terms of photocatalytic water splitting via DFT calculations. For all compounds, the Raman spectra were calculated. The SMoO, SeMoO, SMoSe, SMoTe and SeMoTe compounds are dynamically stable and are semiconductors. Among all considered structures SMoTe is the most promising candidate for solar hydrogen production because valence and conduction bands perfectly engulf the redox potentials of water at both neutral and acidic media, opposite to SMoSe, SMoO, SeMoO suitable only in the acidic media, and SeMoTe – in the neutral media. Moreover, A′-SMoTe demonstrates the outstanding values of the solar-to-hydrogen (STH) conversion efficiencies of 54.0 and 67.1 for neutral and acidic media.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Chirkin A. S.
Заглавие : Frequency doubling of femtosecond laser pulses in three dimensional nonlinear photonic crystals
Колич.характеристики :6 с
Место публикации : Laser Phys. Lett. - 2023. - Vol. 20, Is. 3. - Ст.035402. - ISSN 16122011 (ISSN), DOI 10.1088/1612-202X/acb7f5. - ISSN 1612202X (eISSN)
Примечания : Cited References: 20. - This work was supported by the Russian Science Foundation (Grant # 19-12-00203). The authors thank N Davletshin for graphical illustration of NPC
Аннотация: Quasi-phase matched nonlinear frequency conversion in three dimensional nonlinear photonic crystals (NPCs) has been considered for implementation of the second harmonic generation of transform-limited and chirped femtosecond laser pulses. Spatial distribution of the second harmonic intensity is shown to be caused by Cherenkov- and Raman–Nath-type nonlinear diffraction. These types of nonlinear diffraction may occur simultaneously resulting in an efficient multi-order nonlinear diffraction in the Bragg regime, which can be realized by a proper choice of the modulation period of NPC structure in longitudinal direction for considered transverse diffraction order. Three dimensional NPCs open up new possibilities for ultrafast nonlinear photonics and parametric interactions in optics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabalina A. V., Anikeev S. G., Kulinich S. A., Artyukhova N. V., Vlasov V. A., Kaftaranova M. I., Hodorenko V. N., Yakovlev E. V., Pesterev E. A., Lukyanenko A. V., Volochaev M. N., Pakholkina S., Mamazakirov O., Stolyarov V. V., Mokshin A. V., Gunther V. E.
Заглавие : Combined porous-monolithic TiNi materials surface-modified with electron beam for new-generation rib endoprostheses
Место публикации : J. Funct. Biomater. - 2023. - Vol. 14, Is. 5. - Ст.277. - ISSN 20794983 (eISSN), DOI 10.3390/jfb14050277
Примечания : Cited References: 57. - The study was supported by the Russian Science Foundation (grant no. 19-79-10045). https://rscf.ru/project/19-79-10045/
Аннотация: TiNi alloys are very widely used materials in implant fabrication. When applied in rib replacement, they are required to be manufactured as combined porous-monolithic structures, ideally with a thin, porous part well-adhered to its monolithic substrate. Additionally, good biocompatibility, high corrosion resistance and mechanical durability are also highly demanded. So far, all these parameters have not been achieved in one material, which is why an active search in the field is still underway. In the present study, we prepared new porous-monolithic TiNi materials by sintering a TiNi powder (0–100 μm) on monolithic TiNi plates, followed by surface modification with a high-current pulsed electron beam. The obtained materials were evaluated by a set of surface and phase analysis methods, after which their corrosion resistance and biocompatibility (hemolysis, cytotoxicity, and cell viability) were evaluated. Finally, cell growth tests were conducted. In comparison with flat TiNi monoliths, the newly developed materials were found to have better corrosion resistance, also demonstrating good biocompatibility and potential for cell growth on their surface. Thus, the newly developed porous-on-monolith TiNi materials with different surface porosity and morphology showed promise as potential new-generation implants for use in rib endoprostheses.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Isaenko L., Dong L., Kurus A., Lin Z., Yelisseyev A., Lobanov S., Molokeev M. S., Korzhneva K., Goloshumova A.
Заглавие : LixAg1–xGaSe2: interplay between lithium and silver in mid-infrared nonlinear optical chalcogenides
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10, Is. 24. - Ст.2201727. - ISSN 21951071 (ISSN), DOI 10.1002/adom.202201727
Примечания : Cited References: 37. - This work was supported by the National Natural Science Foundation of China (Grant No. 22133004), Russian Science Foundation, grant # 19‐12‐00085‐P (crystal growth, crystal structure analysis, band gap measurement) and partly done on state assignment of IGM SB RAS (composition chemical analysis)
Аннотация: AgGaSe2 and LiGaSe2 are two famous mid-infrared nonlinear optical (NLO) materials with similar chemical formula but different structural symmetry. The former material has relatively larger NLO effect and birefringence but rather small energy band gap, while the latter is the opposite. Aiming at achieving a good balance of NLO properties, here the substitution between silver and lithium ions on the evolution of structural and optical properties in a new series of LixAg1–xGaSe2 crystals is systematically investigated. It reveals that, with the increase of Li content, LixAg1–xGaSe2 almost keeps the same tetragonal symmetry with AgGaSe2 until x ≈ 0.9. The NLO effects and birefringence values vary with respect to x with the largest variation at x = 0.8–0.9. The optimal combination of birefringence (0.03–0.025) and nonlinear parameters (26–30 pm V−1) is achieved at x = 0.4–0.5. As the energy band gap increases with the increase of x, the maximal value of 2.2 eV for chalcopyrite structure suggests that the laser-induced damage threshold of LixAg1–xGaSe2 would be as large as five-fold of AgGaSe2. This study provides a good example to show that the rational substitution between Li and Ag can significantly improve the balance of NLO properties in chalcogenides.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Afonin A. O., Belyaev B. A., Boev N. M., Govorun I. V., Izotov A. V., Ugrymov A. V., Leksikov An. A.
Заглавие : Second harmonic generation as a probe of parametric spin wave instability processes in thin magnetic films
Место публикации : Phys. Rev. B. - 2022. - Vol. 106, Is. 6. - Ст.064406. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.106.064406
Примечания : Cited References: 33. - This work was supported by the Russian Science Foundation under Grant No. 19-72-10047. The equipment of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” was used during the measurements
Аннотация: We have explored the dynamic response of in-plane magnetized thin permalloy films excited by microwave fields of high amplitudes (up to 3 Oe) at 1 GHz. The response was detected using a microstrip line by measuring the second harmonic signal generated by the dynamic components of the uniform magnetization. The data measured at ferromagnetic resonance showed the threshold effect of the Suhl parametric instability process. With the increase of the microwave power above the threshold value, the dynamic response revealed an intricate nonlinear behavior, including the emergence of an additional threshold. This second threshold can be explained in terms of the "stage by stage"process of parametric spin wave excitation following the S theory of Zakharov, L'vov, and Starobinets.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Kiselev, Evgeniy G., Demidenko, Alexey V., Zhila, Natalia O., Nemtsev I. V., Lukyanenko A. V.
Заглавие : Production and properties of microbial polyhydroxyalkanoates synthesized from hydrolysates of Jerusalem artichoke tubers and vegetative biomass
Коллективы : Project "Agropreparations of the new generation: a strategy of construction and realization" [075-15-2021-626]; State Assignment of the Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0006]
Место публикации : Polymers. - 2022. - Vol. 14, Is. 1. - Ст.132. - ISSN 2073-4360(eISSN), DOI 10.3390/polym14010132
Примечания : Cited References: 93. - This study was financially supported by Project "Agropreparations of the new generation: a strategy of construction and realization" (Agreement No. 075-15-2021-626) in accordance with Resolution No. 220 of the Government of the Russian Federation of 9 April 2010, "On measures designed to attract leading scientists to the Russian institutions of higher learning" (polymer synthesis, properties), and by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0006 (films production, surface properties)
Предметные рубрики: GLUCOSE-UTILIZING STRAIN
RALSTONIA-EUTROPHA
ASPERGILLUS-NIGER
ACID
Аннотация: One of the major challenges in PHA biotechnology is optimization of biotechnological processes of the entire synthesis, mainly by using new inexpensive carbon substrates. A promising substrate for PHA synthesis may be the sugars extracted from the Jerusalem artichoke. In the present study, hydrolysates of Jerusalem artichoke (JA) tubers and vegetative biomass were produced and used as carbon substrate for PHA synthesis. The hydrolysis procedure (the combination of aqueous extraction and acid hydrolysis, process temperature and duration) influenced the content of reducing substances (RS), monosaccharide contents, and the fructose/glucose ratio. All types of hydrolysates tested as substrates for cultivation of three strains—C. necator B-10646 and R. eutropha B 5786 and B 8562—were suitable for PHA synthesis, producing different biomass concentrations and polymer contents. The most productive process, conducted in 12-L fermenters, was achieved on hydrolysates of JA tubers (X = 66.9 g/L, 82% PHA) and vegetative biomass (55.1 g/L and 62% PHA) produced by aqueous extraction of sugars at 80 °C followed by acid hydrolysis at 60 °C, using the most productive strain, C. necator B-10646. The effects of JA hydrolysates on physicochemical properties of PHAs were studied for the first time. P(3HB) specimens synthesized from the JA hydrolysates, regardless of the source (tubers or vegetative biomass), hydrolysis conditions, and PHA producing strain employed, exhibited the 100–120 °C difference between the Tmelt and Tdegr, prevailing of the crystalline phase over the amorphous one (Cx between 69 and 75%), and variations in weight average molecular weight (409–480) kDa. Supplementation of the culture medium of C. necator B-10646 grown on JA hydrolysates with potassium valerate and ε-caprolactone resulted in the synthesis of P(3HB-co-3HV) and P(3HB-co-4HB) copolymers that had decreased degrees of crystallinity and molecular weights, which influenced the porosity and surface roughness of polymer films prepared from them. The study shows that JA hydrolysates used as carbon source enabled productive synthesis of PHAs, comparable to synthesis from pure sugars. The next step is to scale up PHA synthesis from JA hydrolysates and conduct the feasibility study. The present study contributes to the solution of the critical problem of PHA biotechnology—finding widely available and inexpensive substrates.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yelisseyev A., Lobanov S., Molokeev M. S., Zhang S., Pugachev A., Lin Z., Vedenyapin V., Kurus A., Khamoyam A., Isaenko L.
Заглавие : A New Nonlinear Optical Selenide Crystal AgLiGa2Se4 with Good Comprehensive Performance in Mid-Infrared Region
Место публикации : Adv. Opt. Mater. - 2021. - Vol. 9, Is. 5. - Ст.2001856. - ISSN 21951071 (ISSN), DOI 10.1002/adom.202001856
Примечания : Cited References: 32. - Crystal growth and investigation of physical properties were supported by Russian Science Foundation, Russia (#19‐12‐00085). Spectroscopic data were obtained at the Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Russia; Ministry of Science and Higher Education, Russia (performed on a state assignment). The work on first‐principles calculations also supported by National Science Foundation in China (No.51872297) and Fujian Institute of Innovation (FJCXY18010201) in Chinese Academy of Sciences
Аннотация: Mid‐infrared (mid‐IR) nonlinear optical (NLO) crystals are indispensable for the mid‐IR lasers generation with tunable wavelengths from 3 to 20 µm. AgGaSe2 is a commercial mid‐IR NLO crystal with the highest figures of merit, but suffers low laser damage threshold (LDT). To achieve the balance of optical transmission, NLO effect, and LDT, it is proposed to molecularly modify the AgGaSe2 structure by introducing the [LiSe4] tetrahedra, and successfully grow large crystals of a new selenide AgLiGa2Se4. The replacement of half of the heavy Ag+ cations with light Li+ increases the band gap to 2.2 eV (vs. 1.7 eV in AgGaSe2). The LDT value in AgLiGa2Se4 increases five times compared to that in AgGaSe2, while keeping a relatively large NLO susceptibility of 26 pm V−1. Moreover, the thermal expansion coefficients in AgLiGa2Se4 are approximately two times lower in absolute value compared with AgGaSe2, which is beneficial to the large crystal growth. All these advantages would make AgLiGa2Se4 a new promising NLO crystal for mid‐IR laser applications.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Afonin A. O., Belyaev B. A., Boev N. M., Govorun I. V., Izotov A. V., Ugryumov A. V., Leksikov An. A.
Заглавие : Second harmonic generation in thin permalloy film
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-72-10047]
Место публикации : J. Phys. D. - 2021. - Vol. 54, Is. 42. - Ст.425002. - ISSN 0022-3727, DOI 10.1088/1361-6463/ac1762. - ISSN 1361-6463(eISSN)
Примечания : Cited References: 43. - This work was supported by the Russian Science Foundation under Grant No. 19-72-10047. The equipment of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center 'Krasnoyarsk Science Center SB RAS' was used during the measurement
Предметные рубрики: FERROMAGNETIC-RESONANCE
MAGNETIZATION DYNAMICS
HARMONIC-GENERATION
FERRITES
Аннотация: Second harmonic generation versus strength and direction of the applied static magnetic field was measured for a thin permalloy (Ni80Fe20) film in a microstrip line at a driving frequency of 1 GHz and maximum input power of ~110 mW. The measurements revealed two peaks in the double frequency signal—in the low static field (~10 Oe) and the high one (~45 Oe). To explain these findings, a macrospin model of a thin magnetic film with in-plane uniaxial magnetic anisotropy was considered. A perturbation expansion of the Landau–Lifshitz–Gilbert equation provided an explanation of the experimental data. The analysis of the model revealed that the low-field peak was caused by the longitudinal second-order magnetization component and the high-field peak by the transversal one. It was also shown that the uniaxial magnetic anisotropy of the film and the dependence of the magnetic damping parameter on the applied field play an important role in the process of the second harmonic generation. The results obtained give insights into some peculiarities of the nonlinear magnetization dynamics that are important in the development of magnetic film-based devices in the field of microwave signal processing and manipulation.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ikonnikov D. A., Myslivets S. A., Arkhipkin V. G., Vyunishev A. M.
Заглавие : 3D optical vortex lattices
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-12-00203]
Место публикации : Ann. Phys.-Berlin. - 2021. - Vol. 533, Is. 7. - Ст.2100114. - ISSN 0003-3804, DOI 10.1002/andp.202100114. - ISSN 1521-3889(eISSN)
Примечания : Cited References: 29. - This work was supported by the Russian Science Foundation (Grant No. 19-12-00203).The surface grating was fabricated and characterized at the Center for Collective Use of the Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences. The authors thank M. N. Volochaev and A. I. Zaitsev for help
Предметные рубрики: MANIPULATION
PARTICLES
ARRAY
BEAMS
GENERATION
TRANSPORT
VORTICES
Аннотация: Fresnel diffraction of light beams with a topological charge on a 2D regular amplitude transparency mask is studied. Numerical predictions show that the 3D optical lattices of optical vortices can be formed using the Talbot effect, with these predictions confirmed by the experimental reconstruction of all 3D optical vortex lattices. The periodicity of the 3D optical vortex lattices is determined by the light wavelength and periodicity of a transparency mask. Furthermore, it is shown that the optical vortices are created and annihilated during light propagation behind the mask with the preservation of the total topological charge. The 3D optical vortex lattices are considered to be tolerant to the perturbations induced by trapped particles caused by the features of the Talbot effect. The 3D optical vortex lattices open new possibilities for light-matter interactions and the related applications.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F.
Заглавие : Interference traps waves in an open system: bound states in the continuum
Коллективы : Russian Foundation for Basic Research Projects [19-02-00055]
Место публикации : Rep. Prog. Phys. - 2021. - Vol. 84, Is. 5. - Ст.055901. - ISSN 0034-4885, DOI 10.1088/1361-6633/abefb9. - ISSN 1361-6633(eISSN)
Примечания : Cited References: 154. - The work was partially supported by Russian Foundation for Basic Research Projects No. 19-02-00055
Предметные рубрики: FANO RESONANCES
2ND-HARMONIC GENERATION
QUANTUM-SYSTEMS
UNIFIED THEORY
Аннотация: I review the four mechanisms of bound states in the continuum (BICs) in the application of microwave and acoustic cavities open to directional waveguides. The most simple are symmetry-protected BICs, which are localized inside the cavity because of the orthogonality of the eigenmodes to the propagating modes of waveguides. However, the most general and interesting is the Friedrich-Wintgen mechanism, when the BICs are the result of the fully destructive interference of outgoing resonant modes. The third type of BICs, Fabry-Perot BICs, occurs in a double resonator system when each resonator can serve as an ideal mirror. Finally, the accidental BICs can be realized in the open cavities with no symmetry like the open Sinai billiard in which the eigenmode of the resonator can become orthogonal to the continuum of the waveguide accidentally due to a smooth deformation of the eigenmode. We also review the one-dimensional systems in which the BICs occur owing to the fully destructive interference of two waves separated by spin or polarization or by paths in the Aharonov-Bohm rings. We make broad use of the method of effective non-Hermitian Hamiltonian equivalent to the coupled mode theory, which detects BICs by finding zero-width resonances.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peschanskii A. V., Glamazda, A. Yu., Gudim I. A.
Заглавие : Spectroscopic study of the TbAl3(BO3)4 single crystal: Raman and luminescence spectroscopy
Место публикации : Low Temp. Phys. - 2020. - Vol. 46, Is. 12. - P.1223-1230. - ISSN 1063-777X, DOI 10.1063/10.0002478. - ISSN 1090-6517(eISSN)
Примечания : Cited References: 20
Предметные рубрики: SCATTERING
GENERATION
ND
Аннотация: The vibrational and luminescence properties of the TbAl3(BO3)4 single crystal were studied in the temperature range of 5–300 K. Raman spectra of the single crystal revealed 5 of 7 A1 and all E phonon modes predicted by the group-theory analysis. The splitting energy between the LO and TO components of polar E phonons is determined. A group of intense bands associated with the 5D4 → 7F0 electronic transition was observed in the energy range of 14520–14680 cm−1 of the luminescence spectra. The intensity of these bands decreases upon heating. At the same time, the bands which can be assigned with 5D4 → 7F6, 5D4 → 7F5, and 5D4 → 7F4 transitions were revealed in luminescence spectra at room temperature. The intensity of these bands is comparable to the intensity of the Raman spectrum of TbAl3(BO3)4. The observation of luminescence from the 5D4 multiplet (20600–20750 cm−1) upon excitation at λexc = 632.8 nm (15803 cm−1) and λexc = 532 nm (18797 cm−1) indicates strong nonlinear properties of the studied crystal. The structure of the main 7F6 multiplet of Tb+3 in the TbAl3(BO3)4 single crystal has been studied at 5 K by Raman spectroscopy. The energies of the electronic levels of 7F6 and 5D4 multiplets were determined from the luminescence spectra measured at 300 K.
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16.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Moryachkov R. V., Zabluda V. N., Berlina A. N., Peters G. S., Kichkailo A. S., Sokolov A. Е.
Заглавие : Small-angle scattering applications to the analysis of aptamer structure and conformational changes
Коллективы : Internetional Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application
Место публикации : Internetional Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application (2020 ; 13-16 July ; Novosibirsk). AIP Conference Proceedings: book of abstracts. - 2020. - Vol. 2299. - Ст.040002. - , DOI 10.1063/5.0030394; \b Synchrotron and free electron laser radiation: generation and application (SFR-2020). - Novosibirsk. - P.45-46
Примечания : Cited References: 40. - The reported study was funded by RFBR, project number 19-32-90266 (investigation of the structure changes). This work was financially supported by Russian Science Foundation (project # 19-44-02020, obtaining of the complexes of aptamer and lead ions). We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities (experiment #MX-2039) and we would like to thank Bart Van Laer for assistance in using beamline BM29
Аннотация: Aptamers, structured single-chain oligonucleotides, are promising tools for detection of a wide variety of compounds, from high to low molecular weight, and affecting on them. The aptamers that are most affine for a detectable compound are selected from the libraries of random sequences by the SELEX method (Systematic evolution of ligands by exponential enrichment). The reason why aptamers deserve a special consideration lies in the specific features of their structure and the mechanism of binding to their target. Aptamers can be exploited for metal-ion sensing, biosensing, drug delivery and other functions. To apply the oligonucleotides in the medicine, ecology, food production, agriculture, etc., we need to know how the aptamers bind to their targets, how they change their conformation upon specific binding and how the environment influences on the affinity of aptamers. Small-Angle X-ray scattering showed that the interaction of aptamers with heavy metal and other divalent ions proceeds according to different mechanisms, and the aptamers used undergo different conformational changes.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva, I., V, Malinovsky V. K., Surovtsev, N., V, Gorev M. V., Ivleva L. I., Lykov P. A.
Заглавие : Temperature dependence of the spontaneous polarization, acoustic and strain anomalies in strontium barium niobate crystals of different chemical compositions probed by the second harmonic generation technique
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00399, 19-42-543-016, AAAA-A17-117052410033-9]
Место публикации : Ferroelectrics. - 2020. - Vol. 560, Is. 1. - P.54-60. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1722883. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, projects no. 18-02-00399 and 19-42-543-016 and State assignment No AAAA-A17-117052410033-9.
Предметные рубрики: SINGLE-CRYSTALS
RELAXOR
GROWTH
Аннотация: In SrxBa1-xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peschanskii A. V., Glamazda, A. Yu., Gudim I. A.
Заглавие : Spectroscopic study of the TbAl3(BO3)4 single crystal: Raman and luminescence spectroscopy
Место публикации : Физ. низких температур. - 2020. - Т. 46, Вып. 12. - С.1437-1445. - ISSN 0132-6414. - ISSN 1816-0328(eISSN)
Примечания : Cited References: 20
Предметные рубрики: SCATTERING
GENERATION
ND
Аннотация: The vibrational and luminescence properties of the TbAl3(BO3)4 single crystal were studied in the temperature range of 5–300 K. Raman spectra of the single crystal revealed 5 of 7 A1 and all E phonon modes predicted by the group-theory analysis. The splitting energy between the LO and TO components of polar E phonons is determined. A group of intense bands associated with the 5D4 → 7F0 electronic transition was observed in the energy range of 14520–14680 cm−1 of the luminescence spectra. The intensity of these bands decreases upon heating. At the same time, the bands which can be assigned with 5D4 → 7F6, 5D4 → 7F5, and 5D4 → 7F4 transitions were revealed in luminescence spectra at room temperature. The intensity of these bands is comparable to the intensity of the Raman spectrum of TbAl3(BO3)4. The observation of luminescence from the 5D4 multiplet (20600–20750 cm−1) upon excitation at λexc = 632.8 nm (15803 cm−1) and λexc = 532 nm (18797 cm−1) indicates strong nonlinear properties of the studied crystal. The structure of the main 7F6 multiplet of Tb+3 in the TbAl3(BO3)4 single crystal has been studied at 5 K by Raman spectroscopy. The energies of the electronic levels of 7F6 and 5D4 multiplets were determined from the luminescence spectra measured at 300 K.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G.
Заглавие : Quasi-phase-matched second-harmonic generation in nonlinear crystals with harmonic modulation of nonlinearity
Место публикации : Laser Phys. - 2020. - Vol. 30, Is. 4. - Ст.045401. - ISSN 1054660X (ISSN), DOI 10.1088/1555-6611/ab7381
Примечания : Cited References: 20
Аннотация: We propose a new type of nonlinear photonic crystal with the lattice representing a harmonic function of the propagation coordinate. This type of spatial modulation of the quadratic nonlinearity is implemented to enhance the second-harmonic generation (SHG) efficiency. The process resembles that realized in periodic nonlinear photonic crystals with rectangular nonlinearity modulation under quasi-phase-matching. Residual periodic oscillations of the second-harmonic intensity were found. Comparison of the unipolar and bipolar modulations showed that they are equivalent with regard to the oscillations. The SHG efficiency in the harmonic lattices is 1.6 times lower compared with the efficiency corresponding to the quasi-phase-matching in periodic nonlinear photonic crystals with rectangular lattices.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Ji-Cai, Miron, Catalin, Ågren, Hans, Polyutov S. P., Gel'mukhanov F.
Заглавие : Resonant X-ray second-harmonic generation in atomic gases
Место публикации : Phys. Rev. A. - 2019. - Vol. 100, Is. 6. - Ст.063403. - ISSN 2469-9926 (ISSN), DOI 10.1103/PhysRevA.100.063403. - ISSN 2469-9934 (eISSN)
Примечания : Cited References: 29. - The research leading to these results has received funding from a public grant from the Laboratoire d’Excellence Physics Atoms Light Matter (LabEx PALM), the Laboratoire d’Excellence MiChEm, and the Swedish Research Council (VR). J.-C.L. acknowledges support from the National Science Foundation of China under Grants No. 11574082 and No. 11974108, and the Fundamental Research Funds for the
Аннотация: We explore the X-ray second harmonic generation process induced by resonant two-photon absorption in systems with inversion symmetry. We show that this process becomes allowed in the X-ray region due to non-dipole contributions. It is found that while a plane wave pump field generates only a longitudinal second harmonic field, a Gaussian pump beam creates also a radially polarized transverse second harmonic field which is stronger than the longitudinal one. Contrary to the longitudinal component, the transverse second harmonic field with zero intensity on the axis of the pump beam can run in free space. Our theory is applied to Ar and Ne atomic vapours and predicts an energy conversion efficiency of X-ray second harmonic generation of 3.2×10−11 and 1.3×10−12, respectively.
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