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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Ignatchenko V. A., Tsikalov D. S.
Заглавие : Wave spectrum in the sinusoidal superlattice with amplitude and phase inhomogeneities
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 99. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Pozdnyakov A. V.
Заглавие : Spectral properties of superlattices with anisotropic inhomogeneities. The transition from 3D to 2D disorder
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.597-600. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.597. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): anisotropic inhomogeneities--dos--green function--superlattice--susceptibility--waves--anisotropic inhomogeneities--continuous transitions--correlation properties--density of state--dynamic susceptibility--inhomogeneities--spectral properties--wave numbers--dos--green's function--magnetic materials--magnetic susceptibility--superlattices--three dimensional--waves--anisotropy
Аннотация: Waves in superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlation during the transition from 3D to 2D disorder is characterized by the parameter ? 1 = k ||/k?-1, where k || and k? are the correlation wave numbers along the axis of the SL and in the plane of the its layers, respectively (r || =k || -1 and r?=k?-1 are the correlation radii). Dependencies of both the dynamic susceptibility and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (? 1 = 0) to the twodimensional ones (? 1 = -1) have been obtained. В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spin-wave spectrum in the sinusoidal superlattice with amplitude and phase inhomogeneities
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.385-388. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.385. - ISSN 1662-9779
Примечания : Cited References: 6
Ключевые слова (''Своб.индексиров.''): dos--dynamic susceptibility--inhomogeneities--spin waves--superlattices
Аннотация: Effects of both the phase and the amplitude inhomogeneities of different dimensionalities on the Green's function and on the one-dimensional density of states of spin waves in the sinusoidal superlattice have been studied. Processes of multiple scattering of waves from inhomogeneities have been taken into account in the self-consistent approximation. © (2014) Trans Tech Publications, Switzerland.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Pozdnyakov A. V.
Заглавие : Spectral Properties of Superlattices with Anisotropic inhomogeneities. The Transition from 3D to 1D Disorder
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : TRENDS IN MAGNETISM. Ser. Solid State Phenomena/ Euro-Asian Symposium "Trends in MAGnetism": Nanospintronics (4 ; 2010 ; 28 June-2 July ; Ekaterinburg): TRANS TECH PUBLICATIONS LTD, 2011. - Vol. 168-169. - P.85-88. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.168-169.85
Примечания : Cited References: 4
Ключевые слова (''Своб.индексиров.''): superlattice--waves--anisotropic inhomogeneities--green's function--susceptibility--dos
Аннотация: Waves in the superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlations is characterized by the parameter lambda=1-k(perpendicular to)/k(parallel to), where k(parallel to) and k(perpendicular to) are the correlation wave numbers along the axis of the SL and in the plane of its layers, respectively (r(parallel to) = k(parallel to)(-1) and r(perpendicular to) = k(perpendicular to)(-1) are the correlation radii). Dependencies of both the dynamic susceptibility and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (lambda=0) to the one-dimensional ones (lambda=1) have been obtained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Pozdnyakov A. V.
Заглавие : Spectral properties of superlattices with anisotropic inhomogeneities. The transition from 3D to 1D disorder
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2011. - Vol. 168-169. - P.85-88. - ISSN 1012-0394, DOI 10.4028/www.scientific.net/SSP.168-169.85. - ISSN 9783037850213
Ключевые слова (''Своб.индексиров.''): anisotropic inhomogeneities--dos--green's function--superlattice--susceptibility--waves--anisotropic inhomogeneities--continuous transitions--correlation properties--density of state--dynamic susceptibility--inhomogeneities--spectral properties--susceptibility--wave numbers--differential equations--magnetic susceptibility--superlattices--three dimensional--anisotropy
Аннотация: Waves in the superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlations is characterized by the parameter ? = 1-k? / k ?, where k ? and k? are the correlation wave numbers along the axis of the SL and in the plane of its layers, respectively (r ? k ?-1 and r? = k?-1 are the correlation radii). Dependencies of both the dynamic susceptibility and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (? = 0 ) to the one-dimensional ones (? =1) have been obtained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spectral properties of waves in superlattices with 2D and 3D inhomogeneities
Место публикации : Journal of Experimental and Theoretical Physics. - 2011. - Vol. 113, Is. 2. - P.232-244. - ISSN 1063-7761, DOI 10.1134/S1063776111080061
Ключевые слова (''Своб.индексиров.''): analytic expressions--brillouin zone boundary--density of state--dynamic susceptibility--inhomogeneities--one-dimensional density--optical methods--optical structures--peak height--root mean squares--spectral properties--superlattice layers--two phase--wave numbers--green's function--magnetic susceptibility--optical multilayers--phase interfaces--three dimensional--superlattices
Аннотация: We investigate the dynamic susceptibility and one-dimensional density of states in an initially sinusoidal superlattice containing simultaneously 2D phase inhomogeneities simulating correlated rough-nesses of superlattice interfaces and 3D amplitude inhomogeneities of the superlattice layer materials. The analytic expression for the averaged Green's function of the sinusoidal superlattice with two phase inhomogeneities is derived in the Bourret approximation. It is shown that the effect of increasing asymmetry in the peak heights of dynamic susceptibility at the Brillouin zone boundary of the superlattice, which was discovered earlier [15] upon an increase in root-mean-square (rms) fluctuations, also takes place upon an increase in the correlation wavenumber of inhomogeneities. However, the peaks in this case also become closer, and the width and depth of the gap in the density of states decrease thereby. It is shown that the enhancement of rms fluctuations of 3D amplitude inhomogeneities in a superlattice containing 2D phase inhomogeneities suppresses the effect of dynamic susceptibility asymmetry and leads to a slight broadening of the gap in the density of states and a decrease in its depth. Targeted experiments aimed at detecting the effects studied here would facilitate the development of radio-spectroscopic and optical methods for identifying the presence of inhomogeneities of various dimensions in multilayer magnetic and optical structures. В© 2011 Pleiades Publishing, Ltd.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Green’s function of spin and electromagnetic waves in the sinusoidal superlattice
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2014): 29 June - 3 July 2014 : вook of abstracts. - 2014. - Ст.2PO-M-1. - P.860. - ISBN 978-5-91978-025-0
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Green’s functions of spin and electromagnetic waves in the sinusoidal superlattice
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: N. Perov, A. Semisalova: Trans Tech Publications Ltd, 2015. - Vol. 233-234: Achievements in Magnetism. - P.47-50. - ISSN 1662-9779, DOI 10.4028/www.scientific.net/SSP.233-234.47. - ISSN 978-3-03835-482-6
Ключевые слова (''Своб.индексиров.''): continued fractions--electromagnetic waves--green’s functions--magnonic crystals--photonic crystals--sinusoidal modulation--spin waves--superlattices--circular waveguides--fourier transforms--green's function--photonic crystals--spin waves--superlattices--analytical expressions--continued fraction--fourier transformations--magnonic crystals--s function--sinusoidal modulation--spectral representations--electromagnetic waves
Аннотация: The problem of finding the Green's function of spin and electromagnetic waves in the sinusoidal superlattice is considered. An analytical expression for the spectral representation of the Green's function has been found in the form of ascending continued fractions, the particular denominators of which are ordinary continued fractions. The Green’s function in the r -space has been found by the numerical Fourier transformation of the Greens’s function found in the spectral representation. © (2015) Trans Tech Publications, Switzerland.
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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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Mankov Y. I., Tsikalov D. S.
Заглавие : High-Frequency Susceptibility of a Superlattice with 2D Inhomogeneities
Коллективы :
Разночтения заглавия :авие SCOPUS: High-frequency susceptibility of a superlattice with 2D inhomogeneities
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 107, Is. 4. - P603-611. - ISSN 1063-7761, DOI 10.1134/S1063776108100075
Примечания : Cited References: 26. - This work was supported in part by grant no. 3818.2008.3 from the President of Russia in accordance with the program supporting leading scientific schools.
Предметные рубрики: SPIN-WAVE SUSCEPTIBILITY
PERIODIC MULTILAYERS
LOCALIZATION
SYSTEMS
SPECTRUM
DISORDER
MEDIA
Ключевые слова (''Своб.индексиров.''): energy conservation--energy gap--energy management--frequency bands--gallium alloys--green's function--probability density function--three dimensional--band gaps--energy conservation laws--green functions--high frequencies--imaginary parts--magnon crystals--scattered waves--superlattice layers--wave spectrums--phase interfaces
Аннотация: We investigate the high-frequency susceptibility (Green function) of an initially sinusoidal 1D superlattice with 2D phase inhomogeneities that model the deformations of the interfaces between the superlattice layers. For waves propagating along the superlattice axis ( the geometry of a photon or magnon crystal), we have found a peculiar behavior of the imaginary part of the Green function that consists in a significant difference between the peaks corresponding to the edges of the band gap in the wave spectrum. The peak corresponding to the lower-frequency band edge remains essentially unchanged as the root-mean-square fluctuation of the 2D inhomogeneities. 2 increases, while the peak corresponding to the higher-frequency band edge broaden and decreases sharply in height until its complete disappearance with increasing gamma(2). This behavior of the peaks corresponds to a band gap closure mechanism that differs from the traditional one characteristic of 1D and 3D inhomogeneities. These effects can be explained by a peculiarity of the energy conservation laws for the incident and scattered waves for 2D inhomogeneities in a 1D superlattice.
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