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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Вьюнышев, Андрей Михайлович, Тимофеев, Иван Владимирович, Поспелов Г. И., Наседкин Б. А., Шереметьева Ю. А., Чиркин А. С.
Заглавие : Усиление эффекта нелинейной дифракции Рамана-Ната в двумерных нелинейных структурах [Электронный ресурс]
Коллективы : Московский государственный университет им. М.В. Ломоносова, Волны-2015. Всероссийская школа-семинар "Физика и применение микроволн" имени А.П. Сухорукова, "Физика и применение микроволн", Всероссийская школа-семинар имени А.П. Сухорукова
Место публикации : Ученые зап. физ. фак-та МГУ. - М.: МГУ, 2015. - № 4. - Ст.154302. - ISSN 2307-9665
Примечания : Библиогр.: 5. - Работа выполнена при финансовой поддержке гранта Президента РФ МК-2908.2015.2, а также гранта РФФИ № 15-02-03838. - Электронный журнал
Ключевые слова (''Своб.индексиров.''): генерация второй гармоники--квазисинхронизм--нелинейная дифракция--second harmonic generation--quasi-phase-matching--nonlinear diffraction
Аннотация: Рассмотрена нелинейная дифракция Раман-Ната в процессе генерации второй гармоники в двумерных нелинейных фотонно-кристаллических структурах. Получено аналитическое выражение для расчета спектрально-угловых характеристик генерируемого излучения. Нелинейная структура оптимизирована методом суперпозиции модуляции нелинейности для достижения эффективной множественной генерации второй гармоники.Raman–Nath nonlinear diffraction in the process of second harmonic generation in two-dimensional nonlinear photonic structures is considered. An analytical expression for the calculation of spectral-angular characteristics of radiation is obtained. Nonlinear structure is optimized by the method of superposition of nonlinear susceptibility modulation to obtain efficient multiple second harmonic generation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Александровский, Александр Сергеевич, Вьюнышев, Андрей Михайлович, Зайцев, Александр Иванович, Иконников, Антон Андреевич, Поспелов, Геннадий Игоревич, РОВСКИЙ, Владимир Евгеньевич, Слабко, Виталий Васильевич
Заглавие : Генерация дальнего ультрафиолетового излучения в кристалле SBO с нерегулярной доменной структурой
Место публикации : Квантовая электроника. - Москва: Федеральное государственное бюджетное учреждение науки Физический институт им. П.Н. Лебедева Российской академии наук, 2011. - Т. 41, № 8. - С. 748-753. - ISSN 0368-7147
ГРНТИ : 47.35
Предметные рубрики:
Аннотация: Реализован случайный (стохастический) фазовый квазисинхронизм для широкополосного излучения в одномерном нерегулярном нелинейном фотонном кристалле тетрабората стронция. Получена генерация излучения, перестраиваемого в спектральном диапазоне 187.5 — 215 нм. Средняя мощность генерируемого излучения квадратично зависит от мощности излучения накачки и достигает 1 мкВт. В рамках стационарной модели учет процессов генерации излучения на суммарных частотах в пределах спектра основного излучения не приводит к уширению пичков в спектре генерируемого излучения.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Вьюнышев, Андрей Михайлович, Тимофеев, Иван Владимирович, Чиркин А. С.
Заглавие : Генерация второй гармоники в регулярных доменных структурах с флуктуациями толщины промежуточных однородных слоев
Коллективы : "Волновые явления в неоднородных средах", всероссийская школа-семинар имени А. П. Сухорукова, Волны-2016. Всероссийская школа-семинар "Волновые явления в неоднородных средах" имени А. П. Сухорукова
Место публикации : Ученые зап. физ. фак-та МГУ. - 2016. - № 5. - Ст.165310. - ISSN 2307-9665
Примечания : Библиогр.: 4. - Работа выполнена при финансовой поддержке гранта Президента РФ МК-2908.2015.2, а также РФФИ (грант № 15-02-03838).
Ключевые слова (''Своб.индексиров.''): генерация второй гармоники--регулярные доменные структуры--second optical harmonic generation--domain structures
Аннотация: Теоретически изучен процесс генерации второй оптической гармоники в квадратично- нелинейных кристаллах, состоящих из чередующихся однородных слоёв и слоёв с периодическим изменением знака нелинейности. Установлена зависимость эффективности процесса от числа слоев и дисперсии толщины однородных слоев.The second optical harmonic generation in quadratic nonlinear crystal structure is theoretically investigated. The structure consists of regularly modulated inhomogeneous layers that are divided by homogeneous layers of random thickness. The dependence of the process eﬃciency on the layer number and dispersion of the layer thickness is determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Aleksandrovsky A. S., Zaitsev A. I., Slabko V. V.
Заглавие : Čerenkov nonlinear diffraction in random nonlinear photonic crystal of strontium tetraborate
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2012. - Vol. 101, Is. 21. - Ст.211114. - ISSN 0003-6951, DOI 10.1063/1.4767385
Примечания : Cited References: 29. - The work was supported by RFBR through the Grant No. 12-02-31167, by the Ministry of Education and Science of Russian Federation (Contract No. 14.B37.21.0730 and Grant No. 2.1.1/3455), by RAS Projects 24.29 and 24.31, by PSB RAS Projects 2.5.2 and 3.9.5, by SB RAS Projects 43 and 101, and by SFU Grant F12.
Предметные рубрики: POLED LITHIUM-NIOBATE
2ND-HARMONIC GENERATION
BARIUM NIOBATE
PULSES
Аннотация: Čerenkov-type second harmonic generation of femtosecond pulses in random one-dimensional nonlinear photonic crystal of strontium tetraborate is investigated experimentally and theoretically. Sidebands in angular-spectral dependence of generated second harmonic were detected and found to be in perfect agreement with calculations. Spectral maximum of generated radiation experiences deviation from Čerenkov relation due to influence of nonlinear photonic crystal structure. Pulse duration and local spectrum of Čerenkov second harmonic are measured and found to be in fair agreement with each other.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva Yu. V., Palyanov Y .N., Sokol A. G., Borzdov Y. M., Bayukov O. A.
Заглавие : Wüstite stability in the presence of a CO2-fluid and a carbonate-silicate melt: Implications for the graphite/diamond formation and generation of Fe-rich mantle metasomatic agents
Место публикации : Lithos: Elsevier, 2016. - Vol. 244. - P.20-29. - ISSN 00244937 (ISSN), DOI 10.1016/j.lithos.2015.12.001
Примечания : Cited References: 68. - This work was supported by the Russian Science Foundation under grant no. 14-27-00054. The authors thank A. Moskalev for his assistance in the work preparation, A. Khokhryakov for useful suggestions throughout the study, and S. Ovchinnikov for his assistance in implementation of Mössbauer spectroscopy measurements. The authors thank editor M. Scambelluri, and two anonymous reviewers for their useful comments, which helped to profoundly improve the manuscript.
Предметные рубрики: EARTHS LOWER MANTLE
FERRIC IRON CONTENT
DIAMOND FORMATION
MINERAL INCLUSIONS
NATURAL DIAMOND
OXIDATION-STATE
DEEP MANTLECRUST
LITHOSPHERIC MANTLE
OXYGEN FUGACITY
OCEANIC-CRUST
Ключевые слова (''Своб.индексиров.''): wustite--co2-fluid--carbonate-silicate melt--decarbonation--graphite formation--hpht experiment
Аннотация: Experimental simulation of the interaction of wüstite with a CO2-rich fluid and a carbonate-silicate melt was performed using a multianvil high-pressure split-sphere apparatus in the FeO-MgO-CaO-SiO2-Al2O3-CO2 system at a pressure of 6.3GPa and temperatures in the range of 1150°C-1650°C and with run time of 20h. At relatively low temperatures, decarbonation reactions occur in the system to form iron-rich garnet (Alm75Prp17Grs8), magnesiowüstite (Mg#≤0.13), and CO2-rich fluid. Under these conditions, magnesiowüstite was found to be capable of partial reducing CO2 to C0 that leads to the formation of Fe3+-bearing magnesiowüstite, crystallization of magnetite and metastable graphite, and initial growth of diamond seeds. At T≥1450°C, an iron-rich carbonate-silicate melt (FeO~56wt.%, SiO2~12wt.%) forms in the system. Interaction between (Fe,Mg)O, SiO2, fluid and melt leads to oxidation of magnesiowüstite and crystallization of fayalite-magnetite spinel solid solution (1450°C) as well as to complete dissolution of magnesiowüstite in the carbonate-silicate melt (1550°C-1650°C). In the presence of both carbonate-silicate melt and CO2-rich fluid, dissolution (oxidation) of diamond and metastable graphite was found to occur. The study results demonstrate that under pressures of the lithospheric mantle in the presence of a CO2-rich fluid, wüstite/magnesiowüstite is stable only at relatively low temperatures when it is in the absolute excess relative to CO2-rich fluid. In this case, the redox reactions, which produce metastable graphite and diamond with concomitant partial oxidation of wüstite to magnetite, occur. Wüstite is unstable under high concentrations of a CO2-rich fluid as well as in the presence of a carbonate-silicate melt: it is either completely oxidized or dissolves in the melt or fluid phase, leading to the formation of Fe2+- and Fe3+-enriched carbonate-silicate melts, which are potential metasomatic agents in the lithospheric mantle. © 2015 Elsevier B.V.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Chirkin, A. S.
Заглавие : Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction
Коллективы : Council of the President of the Russian Federation [MK-2908.2015.2]; Russian Foundation for Basic Research (RFBR) [15-02-03838]
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2015. - Vol. 32, Is. 12. - P.2411-2416. - ISSN 0740-3224, DOI 10.1364/JOSAB.32.002411. - ISSN 1520-8540(eISSN)
Примечания : Cited References:31. - Council of the President of the Russian Federation (MK-2908.2015.2); Russian Foundation for Basic Research (RFBR) (15-02-03838).
Предметные рубрики: FEMTOSECOND LASER-PULSES
POLED LITHIUM-NIOBATE
PHOTONIC CRYSTAL
COMPRESSION
CONVERSION
Аннотация: We analyze second-harmonic generation (SHG) in a two-dimensional nonlinear optical superlattice (NLOS) with its modulation period being chirped in the propagation direction and constant in the transverse direction. This results in efficient multiple SHG via nonlinear Raman–Nath diffraction. We obtain exact analytical expressions for a SH amplitude generated in chirped 2D NLOSs and for its quasi-phase-matching bandwidth. The results of analytical calculations are in excellent agreement with the numerical ones. We show that the process is robust to angular deviations of NLOS and it can be applied to enable tunable and broadband frequency conversion.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G., Chirkin A. S.
Заглавие : Theory of noncollinear frequency doubling of transform limited pulses in non-steady-state regime
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2016. - Vol. 33, Is. 11. - P.2308-2312. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.33.002308
Примечания : Cited References: 22. - Council of the President of the Russian Federation (MK-2908.2015.2); Russian Foundation for Basic Research (RFBR) (15-02-03838); Krasnoyarsk Regional Fund for Science and Technical Activity Support.The authors thank I. V. Timofeev for the fruitful discussions and theoretical support.
Ключевые слова (''Своб.индексиров.''): band structure--frequency doublers--gaussian beams--nonlinear optics--phase matching--analytical expressions--frequency-doubling--interaction geometries--intersection angles--parametric interactions--phase matching conditions--spectral bandwidth--transform-limited pulse--harmonic generation
Аннотация: Noncollinear second-harmonic generation from two ultrashort pulses intersecting in a nonlinear medium is studied in spectral and time domains. We derive analytical expressions for the second-harmonic (SH) amplitude in crystals of finite thickness neglecting diffraction. The contribution from characteristics of the fundamental radiation and interaction geometry to the process is analyzed. In addition, refined phase-matching conditions are obtained. We find that the spectral bandwidth is determined by the intersection angle and can be enlarged. The SH pulse duration can be optimized by varying the fundamental beam size and the intersection angle. It is found that the SH beam excited by a Gaussian fundamental beam becomes elliptical. It is shown that the fundamental pulse duration can be readily characterized with single pulses by means of measuring the ellipticity of the SH beam profile. The approach developed can potentially be used to calculate parametric interactions of fundamental pulses with an arbitrary spectrum. © 2016 Optical Society of America.
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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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vyunishev A. M., Arkhipkin V. G.
Заглавие : Non-collinear second harmonic generation in two-dimensional nonlinear optical superlattices
Коллективы : International symposium and school for young scientist "Modern problems of laser physics", Международный симпозиум и школа для молодых ученых "Современные проблемы лазерной физики", Институт лазерной физики Сибирского отделения РАН, Новосибирский государственный университет, Институт спектроскопии РАН, Московский государственный университет им. М.В. Ломоносова, Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений
Место публикации : Modern problems of laser physics: матер. симп. - Новосибирск: ЗАО ИПП "Офсет", 2016. - P.250-251 (Шифр 26519667)
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Chirkin, A. S.
Заглавие : Multiple quasi-phase-matching in nonlinear Raman-Nath diffraction
Коллективы : Russian Federation [MK-2908.2015.2], RFBR [15-02-03838]
Место публикации : Opt. Lett.: Optical Society of America, 2015. - Vol. 40, Is. 7. - P.1314-1317. - ISSN 0146, DOI 10.1364/OL.40.001314. - ISSN 15394794(eISSN)
Примечания : Cited References:18. - The work was partially supported by the Grant of the President of the Russian Federation MK-2908.2015.2 and by RFBR Grant No. 15-02-03838.
Предметные рубрики: Femtosecond laser-pulses
2nd-harmonic generation
Photonic crystal
Аннотация: The method of the superposition of a nonlinearity modulation is employed to design a two-dimensional (2D) nonlinear photonic lattice for efficient multiple quasi-phase-matched second harmonic generation in the process of nonlinear Raman-Nath diffraction (NRND). An analytical solution is proposed to calculate the second harmonic intensity in rectangular 2D lattices. This approach can be useful for the generation of multiple second harmonic beams with the efficiency a few orders of magnitude higher than in the case of nonphase-matched generation via NRND.
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11.

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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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vetrov S.Ya., Avdeeva A. Y., Timofeev I. V.
Заглавие : Spectral properties of a one-dimensional photonic crystal with a resonant defect nanocomposite layer
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 5. - P.755-761. - ISSN 1063-7761, DOI 10.1134/S1063776111140093
Примечания : Cited References: 33. - This work was supported by projects nos. NSh-7810.2010.3, RNP.2.1.1.3455, 27.1 and 3.9.1 of the Russian Academy of Sciences, 5 and 144 of the Siberian Branch of the Russian Academy of Sciences, and State contract no. 02.740.11.0220 according to the program Research and Scientific-Pedagogical Brainpower of Innovated Russia.
Предметные рубрики: OPTICAL-PROPERTIES
SEMICONDUCTOR MICROCAVITIES
2ND-HARMONIC GENERATION
HETEROGENEOUS MEDIA
MODE
ENHANCEMENT
DISPERSION
SYSTEM
Аннотация: The spectral properties of a one-dimensional photonic crystal with a defect nanocomposite layer that consists of metallic nanoballs distributed in a transparent matrix and is characterized by an effective resonance permittivity are studied. The problem of calculating the transmission, reflection, and absorption spectra of p-polarized waves in such structures is solved for oblique incidence of light, and the spectral manifestation of defect-mode splitting as a function of the volume fraction of nanoballs and the structural parameters is studied. The splitting is found to depend substantially on the nanoball concentration in the defect, the defect layer thickness, and the angle of incidence. The angle of incidence is found at which the resonance frequency of the nanocomposite is located near the edge of the bandgap or falls in the frequency region of a continuous spectrum. The resonance situation appearing in this case results in an additional transmission band or an additional bandgap in the transmission spectrum.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vetrov S.Ya., Pyatnov M. V., Timofeev I. V.
Заглавие : Photonic defect modes in a cholesteric liquid crystal with a resonant nanocomposite layer and a twist defect
Коллективы : SB RAS [43, 101, 24.29]; Russian Fund of Fundamental Research Grant [14-02-31248]; Russian Ministry of Education and Science under the Government program [3.1276.2014/K]; Russian Federation [MK-250.2013.2]; NSCT-SB RAS joint project
Место публикации : Phys. Rev. E: American Physical Society, 2014. - Vol. 90, Is. 3. - Ст.32505. - ISSN 1539-3755, DOI 10.1103/PhysRevE.90.032505. - ISSN 1550-2376
Примечания : Cited References: 36. - This work was partially supported by Grants No. 43, No. 101, and No. 24.29 of SB RAS; Russian Fund of Fundamental Research Grant No. 14-02-31248; Russian Ministry of Education and Science under the Government program, Project No. 3.1276.2014/K; Grant of the President of the Russian Federation Grant No. MK-250.2013.2, and the NSCT-SB RAS joint project.
Предметные рубрики: OPTICAL-PROPERTIES
GENERATION
MEDIA
FILMS
Аннотация: We have studied spectral properties of a cholesteric liquid crystal with a combined defect consisting of a nanocomposite layer and a twist. The nanocomposite layer is made of metallic nanoballs dispersed in a transparent matrix and featuring effective resonant permittivity. A solution has been found for the transmission spectrum of circularly polarized waves in the structure. We have analyzed spectral splitting of the defect mode in the band gap of the cholesteric when its frequency coincides with the nanocomposite resonant frequency. Defect modes have characteristics strongly dependent on the magnitude and the sign of the phase difference of the cholesteric helix on both sides of the defect layer. It has been found that the band gap width and the position and localization degree of defect modes can be effectively controlled by external fields applied to the cholesteric.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov A. K., Shalaev M. I., Myslivets S. A., Slabko V. V.
Заглавие : Unidirectional amplification and shaping of optical pulses by three-wave mixing with negative phonons
Коллективы : US Air Force Office of Scientific Research [FA950-12-1-298]; US National Science Foundation [ECCS-1028353]; Presidium of the Russian Academy of Sciences [24-31]; Russian Federal Program on Science, Education and Innovation [14.A18.21.1942]
Место публикации : Appl. Phys. A: Springer, 2013. - Vol. 115, Is. 2. - P.523-529. - ISSN 0947-8396, DOI 10.1007/s00339-013-8078-4. - ISSN 1432-0630
Примечания : Cited References: 32. - This work was supported in parts by the US Air Force Office of Scientific Research under Grant No. FA950-12-1-298, by the US National Science Foundation under Grant No. ECCS-1028353, by the Presidium of the Russian Academy of Sciences under Grant No. 24-31 and by the Russian Federal Program on Science, Education and Innovation under Grant No. 14.A18.21.1942.
Предметные рубрики: LEFT-HANDED METAMATERIALS
2ND-HARMONIC GENERATION
INDEX METAMATERIALS
NONLINEAR OPTICS
PARAMETRIC AMPLIFICATION
COMPENSATING LOSSES
BACKWARD WAVES
OSCILLATOR
CRYSTALS
Аннотация: A possibility to greatly enhance frequency-conversion efficiency of stimulated Raman scattering is shown by making use of extraordinary properties of three-wave mixing of ordinary and backward waves. Such processes are commonly attributed to negative-index plasmonic metamaterials. This work demonstrates the possibility to replace such metamaterials that are very challenging to engineer by readily available crystals which support elastic waves with contra-directed phase and group velocities. The main goal of this work was to investigate specific properties of indicated nonlinear optical process in short-pulse regime and to show that it enables elimination of fundamental detrimental effect of fast damping of optical phonons on the process concerned. Among the applications is the possibility of creation of a family of unique photonic devices such as unidirectional Raman amplifiers and femtosecond pulse shapers with greatly improved operational properties.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva I. V., Krylov A. S., Malinovsky V. K., Surovtsev N. V., Borzdov Y. M., Kovalevsky V. I.
Заглавие : Uniaxial mechanical stresses and their influence on the parameters of the ferroelectric phase transition in pressure-treated barium titanate
Место публикации : Ferroelectrics: Taylor & Francis, 2017. - Vol. 508, Is. 1. - P.161-166. - ISSN 00150193 (ISSN), DOI 10.1080/00150193.2017.1289769
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): batio3--second harmonic generation--residual mechanical stresses--ferroelectric phase transition
Аннотация: The dependence of the E(TO) line in Raman spectrum of a BaTiO3 powder on applied uniaxial pressure up to 14 GPa are obtained and the values of residual mechanical stresses are evaluated. The second harmonic generation technique is used to obtain the width and temperature of the cubic-to-tetragonal phase transition in the powder treated by uniaxial pressures. The interrelations between the phase transition width, temperatures, and residual mechanical stresses are established. These interrelations differ from expectations based on known hydrostatic pressure-induced effects in BaTiO3.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Vyunishev A. M., Zaitsev A.I., Zamkov A. V., Slabko V.V.
Заглавие : Tunable femtosecond frequency doubling in random domain structure of strontium tetraborate
Место публикации : Opt. Commun. - 2009. - Vol. 282, Is. 11. - P.2263-2266. - ISSN 0030-4018, DOI 10.1016/j.optcom.2009.02.070
Примечания : Cited Reference Count: 16. - Гранты: The work was supported by the RFBR Grant 09-02-00670, Grants of the President of the Russian Federation for the support of leading scientific schools (Nos. SS-1011.2008.2 and SS-3818.2008.3), Grant No. RNP.2.1.1.3455, and the Projects 2.5.2 of PSB RAS, Nos. 5 and 27.1 of SB RAS.Финансирующая организация: RFBR [09-02-00670]; President of the Russian Federation [SS-1011.2008.2, SS-3818.2008.3]; PSB RAS [2.5.2]; SB RAS [5, 27.1]; [RNP.2.1.1.3455]
Предметные рубрики: 2ND-HARMONIC GENERATION
HARMONIC-GENERATION
BARIUM NIOBATE
CRYSTAL
Ключевые слова (''Своб.индексиров.''): domain structures--femtosecond--frequency-doubling--harmonic frequencies--noncollinear--nonlinear photonic crystals--photonic structures--second harmonics--second-harmonic generations--spatial spectrum--tetraborate--harmonic generation--photonic crystals--strontium--harmonic analysis
Аннотация: Efficient tunable femtosecond phase-matched noncollinear second-harmonic generation in randomized nonlinear photonic crystal of strontium tetraborate is obtained. Spatial spectrum of nonlinear photonic structure is not flat but enables tuning of the harmonic frequency in the range from 355 to 460 nm. The narrowing of the bandwidth of second harmonic is found to be of order of 10-20%. (C) 2009 Elsevier B.V. All rights reserved.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vetrov S.Ya., Avdeeva A. Y., Bikbaev R. G., Timofeev I. V.
Заглавие : Traveling of light through a 1D photonic crystal containing a defect layer with resonant dispersion
Место публикации : Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 113, Is. 5. - P.517-521. - ISSN 0030-400X, DOI 10.1134/S0030400X12110070
Примечания : Cited References: 14. - The work was supported by the grants NSh-7810.2010.3, RNP.2.1.1.3455, no. 27.1 and no. 3.9.1 RAS, no. 5 and no. 144 SO RAS, and g/k 02.740.11.0220 of the federal targeted program "Scientific and Pedagogical Personnel of Innovative Russia."
Предметные рубрики: 2ND-HARMONIC GENERATION
MEDIA
MODE
Аннотация: Spectral properties of a 1D photonic crystal that is comprised of two multilayered dielectric mirrors and a nanocomposite layer between them as a structural defect are studied. The nanocomposite consists of silver nanoballs dispersed in a transparent matrix and is characterized by an effective resonant permittivity. The spectral manifestation of the defect mode splitting for the s-polarized waves is studied as a function of the angle of incidence and concentration of nanoballs. Specific features of the transmission spectra for the s- and p-polarized waves are established for the angle of incidence equal to the Brewster angle of the seeding photonic crystal. It is shown, in particular, that, in the region of the continuous transmission spectrum of the spolarized waves, there arises an additional bandgap caused by mixing of the resonant mode with photonic modes.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slabko V. V., Popov A. K., Myslivets S. A., Rasskazova E. V., Tkachenko V. A., Moskalev A. K.
Заглавие : Transient processes in the parametric interaction of counter-propagating waves
Коллективы : RF Ministry of Education and Science (State Research Task) [2014/71, 2014/K, 3470]; US Army Research Office [W911NF-141-0619]
Место публикации : Quantum Electron.: Turpion, 2015. - Vol. 45, Is. 12. - P.1151-1152. - ISSN 1063-7818, DOI 10.1070/QE2015v045n12ABEH015840. - ISSN 1468-4799(eISSN)
Примечания : Cited References:13. - This work was supported by the RF Ministry of Education and Science (State Research Task 2014-2016, Project Nos 2014/71, 2014/K and 3470) and the US Army Research Office (Grant No. W911NF-141-0619).
Предметные рубрики: LEFT-HANDED METAMATERIALS
NEGATIVE-INDEX
2ND-HARMONIC GENERATION
EXPERIMENTAL-VERIFICATION
OSCILLATOR
REFRACTION
Ключевые слова (''Своб.индексиров.''): transient parametric processes--counter-propagating waves--negative refractive index
Аннотация: We present a comparative analysis of transient processes in media with a negative refractive index for the parametric interaction of co- and counter-propagating waves. The transient time for the interaction of counter-propagating waves is shown to considerably exceed that for the interaction of co- propagating waves. In the case of counter-propagating waves, we present fitting results for the generated wave amplitude as a function of time and for the transient time vs. the amplitude of the pump wave and the length of the medium.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Eremin E. V., Shaykhutdinov K. A., Tsikalov V. S., Petrov M. I., Balaev D. A., Semenov S. V.
Заглавие : The magnetic-field-driven effect of microwave detection in a manganite granular system
Место публикации : J. Phys. D. - 2008. - Vol. 41, Is. 1. - Ст.15004. - ISSN 0022-3727, DOI 10.1088/0022-3727/41/1/015004
Примечания : Cited References: 24
Предметные рубрики: IDENTICAL METALS
TUNNEL-JUNCTIONS
MAGNETORESISTANCE
RECTIFICATION
SPINTRONICS
TEMPERATURE
PEROVSKITES
Ключевые слова (''Своб.индексиров.''): bias currents--curie temperature--electric power generation--granular materials--magnetic field effects--microwave irradiation--voltage measurement--direct current voltage--magnetic tunnel junctions--metal insulator metal junctions--nonmagnetic metals--manganites
Аннотация: We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal junctions with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic tunnel junctions and spin dynamics of the grains, which form these junctions in the sample.
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