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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : All-optical switching in a photonic crystal with a defect containing an N-type four-level atomic system
Место публикации : Phys. Rev. A: American Physical Society, 2012. - Vol. 86, Is. 6. - Ст.063816. - ISSN 1050-2947, DOI 10.1103/PhysRevA.86.063816
Примечания : Cited References: 33. - This work was supported in part by the RAS Grants No. 24.29, No. 24.31, and No. 3.9.5, and SB RAS Grants No. 43 and No. 101.
Предметные рубрики: Electromagnetically-induced-transparency
Quantum interference
Microcavities
All-optical switching
Atomic medium
Cross-phase modulations
Defect mode
Electromagnetically induced transparency
Four-level atomic system
Kerr nonlinearity
Laser fields
Linear susceptibility
One dimensional photonic crystal
Probe field
Quantum interference
Resonance frequencies
Third-order susceptibility
Transmission spectrums
Two photon
Аннотация: We study the transmission spectra of a one-dimensional photonic crystal with a defect containing a four-level atomic medium that exhibits a greatly enhanced third-order susceptibility while having a vanishing linear susceptibility dependent on the electromagnetically induced transparency. Two ways of controlling the transmission of a photonic crystal are discussed: via absorption, i.e., nonlinear (two-photon) absorption of the probe field enhanced by constructive quantum interference, and via dispersion, which comes down to shifting the resonance frequency of the defect mode for the probe field by varying the refractive index based on the giant Kerr nonlinearity (cross-phase modulation). We demonstrate that such systems enable nonlinear all-optical switching at ultralow intensities of the coupling and switching laser fields.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belousov O. V., Borisov R. V., Zharkov S. M., Parfenov V. A., Dorokhova L. I.
Заглавие : Redox potentials of gold-palladium powders in aqueous solutions of H2PdCl4
Место публикации : Russ. J. Phys. Chem. A: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 86, Is. 3. - P.484-488. - ISSN 0036-0244, DOI 10.1134/S0036024412020070
Примечания : Cited References: 26
Предметные рубрики: BIMETALLIC NANOPARTICLES
METALLIC PALLADIUM
COPPER
ELECTRODE
BLACK
Bimetallic particles
Bimetallic powders
Gold-palladium
Hydrochloric acid solution
Nernst equation
Redox potentials
Gold
Hydrochloric acid
Redox reactions
Secondary batteries
Transmission electron microscopy
X ray diffraction analysis
Ключевые слова (''Своб.индексиров.''): bimetallic powders--gold-palladium--redox potential
Аннотация: The redox potential of fine-dispersed and compact bimetallic powders of the palladium-gold system in hydrochloric acid solutions of H2PdCl4 at a temperature of 60A degrees C was studied. It was found that the redox potential increases with gold enrichment of the solid solution in accordance with the Nernst equation. The effect of gold-palladium particle size on this redox potential is shown. The morphology, sizes, and composition of bimetallic particles are determined via transmission electron microscopy and X-ray diffraction analysis.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Symmetry breaking for transmission in a photonic waveguide coupled with two off-channel nonlinear defects
Место публикации : Phys. Rev. B: American Physical Society, 2011. - Vol. 83, Is. 4. - Ст.45109. - ISSN 1098-0121, DOI 10.1103/PhysRevB.83.045109
Примечания : Cited References: 50. - This work was partially supported by RFBR Grant No. 09-02-98005-"Siberia" and RFBR Grant No. 11-02-00289.
Предметные рубрики: CRYSTAL-CIRCUITS
LOCALIZED MODES
BISTABILITY
IMPURITIES
RESONANCE
CAVITIES
STATES
MEDIA
Аннотация: We consider light transmission in a two-dimensional (2D) photonic crystal waveguide coupled with two identical nonlinear defects positioned symmetrically aside the waveguide. With the coupled mode theory, we show three scenarios for the transmission. The first one inherits the linear case and preserves the symmetry. In the second scenario, the symmetry is broken because of different light intensities at the defects. In the third scenario, the intensities at the defects are equal but phases of complex amplitudes are different. That results in a vortical power flow between the defects similar to the dc Josephson effect if the input power over the waveguide is applied and the defects are coupled. All of these phenomena agree well with computations based on an expansion of the electromagnetic field into optimally adapted photonic Wannier functions in a 2D photonic crystal.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Varnakov S. N., Ovchinnikov S. G.
Заглавие : In-situ transmission electron microscopy ivestigation of solid-state reactions in Fe/Si multilayer nanofilms
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 41. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karpov S. V., Рассказов, Илья Леонидович
Заглавие : Simulation of conditions for fabrication of optical nanowaveguides in the form of chains of spherical metal nanoparticles by electrostatic functionalization of the process substrate
Место публикации : Colloid J. - 2013. - Vol. 75, Is. 3. - P.279-288. - ISSN 1061-933X, DOI 10.1134/S1061933X13030083
Ключевые слова (''Своб.индексиров.''): deposition of metals--electrical parameter--experimental conditions--nonuniform electric field--ordered structures--selective deposition--single-domain structure--transmission property--deposition--electric fields--mathematical models--metal nanoparticles--photoexcitation--plasmons--sols--substrates
Аннотация: A method is proposed for electrostatic functionalization of substrates used to prepare ordered structures composed of closely spaced plasmon-resonant nanoparticles. The method ensures selective deposition of nanoparticles from the bulk of a colloidal system onto the substrates. This method is based on placing a metal nanotemplate of a required configuration at the opposite side of a substrate, with an electric potential being applied to the template. A mathematical model is developed to ensure that the system parameters responsible for the deposition of metal nanoparticles into ordered single-domain structures on the substrate from a bulk sol in a nonuniform electric field generated by the nanotemplate correspond to the real experimental conditions. Since the degree of imperfection of the synthesized chains governs the applicability of these structures to transmission of the optical excitation at the frequency of the surface plasmon of the particles, the dependence of the degree of imperfection on the physicochemical and electrical parameters of the system is studied using the Brownian-dynamics model. The calculations of the spectral and transmission properties of nanowaveguides of this type are exemplified. В© 2013 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Moiseenko E. T., Altunin R. R., Zeer G. M.
Заглавие : In situ transmission electron microscopy and electron diffraction investigation of solid-state reactions and atomic ordering in Cu/Au bilayer nanofilms
Место публикации : J. Sib. Fed. Univ. Chem. - 2013. - Vol. 6, Is. 3. - P.230-240; Журн. СФУ. Сер. "Химия"
Ключевые слова (''Своб.индексиров.''): cu/au nanofilm--intermetallics--solid state reaction--phase transition--atomic ordering--superstructure--нанопленка cu/au--интерметаллиды--твердофазная реакция--фазовый переход--атомное упорядочение--сверхструктура
Аннотация: Solid-state reaction processes and atomic ordering in Cu/Au bilayer nanofilms (with the atomic ratio Cu:Au≈50:50) have been studied in situ by the methods of transmission electron microscopy and electron diffraction in the process of heating from room temperature up to 700 ºС at a heating rate of 4-8 ºС/min. The solid-state reaction between the nanolayers of copper and gold has been established to begin at 180 ºС. The process of atomic ordering has been shown to start simultaneously with the process of the formation of the disordered phase of Cu50Au50 at 245 ºС. The formation processes of the ordered phases of: CuAuI (L10 superstructure) and CuAuII (long period superstructure) have been studied, as well as the phase transition processes: disorder - order (the transition of the disordered structure into the ordered one) and order - disorder (the transition of the ordered structure into the disordered one).Методами просвечивающей электронной микроскопии и дифракции электронов проведены in situ-исследования процессов твердофазных реакций и атомного упорядочения в двухслойных нанопленках Cu/Au (с атомным соотношением Cu:Au≈50:50) при нагреве от комнатной температуры до 700 ºС при скорости нагрева 4-8 ºС/мин. Установлено, что твердофазная реакция между нанослоями меди и золота начинается при 180 ºС. Показано, что процесс атомного упорядочения начинается одновременно с процессом формирования неупорядоченной фазы Cu50Au50 при 245 ºС. Исследованы процессы формирования атомно-упорядоченных фаз: CuAuI (L10 сверхструктура) и CuAuII (длинно-периодическая сверхструктура), а также процессы фазовых переходов беспорядок-порядок (переход неупорядоченной структуры в атомно-упорядоченную) и порядок-беспорядок (переход атомно-упорядоченной структуры в неупорядоченную)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Рассказов, Илья Леонидович, Markel V. A., Karpov S. V.
Заглавие : Transmission and spectral properties of short optical plasmon waveguides
Место публикации : Opt. Spectrosc. - 2013. - Vol. 115, Is. 5. - P.666-674. - ISSN 0030-400X, DOI 10.1134/S0030400X13110180
Аннотация: We study the spectral and transmission properties of optical waveguides in the form of different chain configurations of spherical Ag nanoparticles that can be synthesized under conditions of selective deposition on a dielectric substrate from a nanocolloid. В© 2013 Pleiades Publishing, Ltd.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuzmenko A. M., Mukhin A. A., Ivanov V.Yu., Bezmaternykh L. N.
Заглавие : Coupled R and Fe magnetic excitations in RFe 3(BO 3) 4 multiferroics
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.269-272. - ISBN 9783037854365, DOI 10.4028/www.scientific.net/SSP.190.269
Ключевые слова (''Своб.индексиров.''): magnetic resonance--rare-earth iron borates--terahertz spectroscopy--antiferromagnetics--coupled mode--exchange coupled--frequency ranges--g factors--iron borate--magnetic excitations--multiferroics--resonance mode--strong interaction--transmission spectrums--antiferromagnetism--electron transitions--gadolinium--ions--magnetic materials--magnetic permeability--magnetic resonance--terahertz spectroscopy--neodymium
Аннотация: Various resonance modes were observed in the transmission spectra of rare-earth iron borates RFe 3(BO 3) 4 (R = Nd 3+, Sm 3+, Gd 3+) at the frequency range 100-600 GHz, which were attributed to collective magnetic excitations in the exchange coupled Fe- and R-subsystems, i.e. antiferromagnetic (Fe) resonance and electron transitions in the R-ions. Strong interaction of the Fe and R oscillations was revealed and theoretically analyzed taking into account feature of the R-ion ground state. Intensities of the coupled modes (contributions to magnetic permeability) strongly depend on a difference of Fe and R ions g-factors that allows defining the sign of the latter. In particular, an appreciable intensity of exchange (Nd) modes in NdFe 3(BO 3) 4 is caused by g Nd?,|| < 0 whereas in GdFe 3(BO 3) 4 with gGd ? gFe ? 2 the exchange (Gd) modes were hided due to compensation of Fe and Gd contributions. In SmFe 3(BO 3) 4, despite a negligible Sm g-factor, the Sm modes were clear observed due to their excitation via coupling with the Fe-subsystem. В© (2012) Trans Tech Publications.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Varnakov S. N.
Заглавие : In situ transmission electron microscopy and electron diffraction investigations of solid-state reactions in thin-film nanosystems
Коллективы : International symposium on self-propagating high temperature synthesis (12; 2013 ; Oct. ; 21–24; South Padre Island, USA )
Место публикации : XII Int. symp. self-propagat. high temper. synth. (SHS-2013): book of abstracts/ org. com. I. N. Flerov [et al.] ; progr. com. V. I. Zinenko [et al.]. - 2013. - P.203-204
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zharkov S. M., Altunin R. R., Moiseenko E. T., Zeer G. M., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Solid-state reactions in Fe/Si multilayer nanofilms
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.144-149. - ISSN 1662-9779, DOI 10.4028/www.scientific.net/SSP.215.144. - ISSN 978-303835054-5
Примечания : Cited References: 16. - The work was supported by the Presidium of RAS (project No. 24.34), the Russian Foundation for Basic Research (grant #13-02-01265)
Ключевые слова (''Своб.индексиров.''): fe/si multilayer nanofilm--intermetallics--solid state reaction--phase transition--magnetic properties--electron diffraction--transmission electron microscopy
Аннотация: Solid-state reaction processes in Fe/Si multilayer nanofilms have been studied in situ by the methods of transmission electron microscopy and electron diffraction in the process of heating from room temperature up to 900ºС at a heating rate of 8-10ºС/min. The solid-state reaction between the nanolayers of iron and silicon has been established to begin at 350-450ºС increasing with the thickness of the iron layer.
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