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1.
2nd Fractional Brownian
motion simulation for the
fractal
properties of ferryhidrite nanoparticles / S. Stan [и др.]> //
2nd International summer school and workshop complex and magnetic soft matter systems: physico-mechanical properties and structure : books of abstacs. - 2014. - P. 78-79
Материалы конференции
Доп.точки доступа:
Stan, S.; Balasoiu, M.; Cristescu, C. P.; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Raikher, Yu. L.; "Complex and magnetic soft matter systems: physico-mechanical properties and structure", International summer school and workshop (2 ; 2014 ; 29 sept.-3 oct. ; Dubna)
}
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2.
Current-voltage characteristics of
a foamed Bi1.8Pb0.3Sr2Ca2Cu3Ox high-temperature superconductor with
fractal
cluster structure / D. A. Balaev [et al.]> // Phys. Solid State. - 2006. -
Vol. 48
,
Is. 2
. - P. 207-212,
DOI
10.1134/S1063783406020016. - Cited References: 27 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
T-C SUPERCONDUCTORS
NORMAL-PHASE
VORTEX MOTION
TRANSITION
TRANSPORT
VORTICES
Аннотация:
The influence of the structure of foamed polycrystalline bismuth-based superconductors on their critical currents and current-voltage characteristics is studied. It is found that superconducting foams have a
fractal
structure, and the
fractal
dimension of the boundary between the normal and superconducting phases is estimated. The magnetic and transport properties of superconducting foams are investigated, and the current-voltage characteristics are obtained in a wide range of currents. The effect of percolation phenomena on vortex pinning in a foamed superconductor is considered. The current-voltage characteristics of the superconducting foams at the beginning of the resistive transition are found to be in good agreement with a model in which a magnetic flux is assumed to be trapped in the
fractal
clusters of a normal phase.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
Univ Guadalajara, CUCEI, Guadalajara 44430, Jalisco, Mexico
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation
Krasnoyarsk Stale University, Krasnoyarsk, 660041, Russian Federation
Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politechnicheskaya ul. 26, St. Petersburg, 194021, Russian Federation
CUCEI Universidad de Guadalajara, Guadalajara, Jalisco, 44430, Mexico
Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Belozerova, I. L.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Kashkina, L. V.; Kuzmin, Y. I.; Michel, C. R.; Petrov, M. I.; Петров, Михаил Иванович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
}
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3.
Effects of size
polydispersity on the extinction spectra of colloidal nanoparticle aggregates / A. E. Ershov [et al.]> // Phys. Rev. B. - 2012. -
Vol. 85
,
Is. 4
. - Ст. 045421. - P. ,
DOI
10.1103/PhysRevB.85.045421. - Cited References: 41. - This work was supported by grants from the following foundations of the Russian Federation: Presidium of RAS, OFN RAS, and SB RAS. . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
METAL
FRACTAL
CLUSTERS
OPTICAL-PROPERTIES
ABSORPTION
NONLINEARITIES
COMPOSITES
SCATTERING
PARTICLES
SPHERES
GRAINS
Аннотация:
We investigate the effect of particle polydispersity on the optical extinction spectra of colloidal aggregates of spherical metallic (silver) nanoparticles, taking into account the realistic interparticle gaps caused by layers of stabilizing polymer adsorbed on the metal surface (adlayers). The spectra of computer-generated aggregates are computed using two different methods. The coupled-multipole method is used in the quasistatic approximation and the coupled-dipole method beyond the quasistatics. The latter approach is applicable if the interparticle gaps are sufficiently wide relative to the particle radii. Simulations are performed for two different particle size distribution functions (bimodal and Gaussian), varying the number of particles per aggregate, and different distribution functions of the interparticle gap width. The strong influence of the latter factor on the spectra is demonstrated and investigated in detail.
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Держатели документа:
[Ershov, Alexander E.
Isaev, Ivan L.
Semina, Polina N.
Karpov, Sergei V.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ershov, Alexander E.
Karpov, Sergei V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Markel, Vadim A.] Univ Penn, Dept Bioengn, Dept Radiol, Philadelphia, PA 19104 USA
[Markel, Vadim A.] Univ Penn, Grad Grp Appl Math & Computat Sci, Philadelphia, PA 19104 USA
Доп.точки доступа:
Ershov, A. E.; Ершов, Александр Евгеньевич; Isaev, I. L.; Исаев, Иван Леонидович; Semina, P. N.; Семина, Полина Николаевна; Markel, V. A.; Karpov, S. V.; Карпов, Сергей Васильевич
}
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4.
Electromagnetic density of
states and absorption of radiation by aggregates of nanospheres with multipole interactions / V. A. Markel [et al.]> // Phys. Rev. B. - 2004. -
Vol. 70
,
Is. 5
. - Ст. 54202,
DOI
10.1103/PhysRevB.70.054202. - Cited References: 81 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
DISCRETE-DIPOLE APPROXIMATION
ENHANCED RAMAN-SCATTERING
METAL
FRACTAL
CLUSTERS
OPTICAL-PROPERTIES
SELECTIVE PHOTOMODIFICATION
DISORDERED CLUSTERS
NUMERICAL-SIMULATION
SPECTRAL DEPENDENCE
PARTICULATE MATTER
LIGHT-SCATTERING
Кл.слова (ненормированные):
carbon
--
iron
--
palladium
--
silver
--
article
--
dipole
--
electromagnetic field
--
geometry
--
mathematical analysis
--
molecular interaction
--
nanoparticle
--
radiation absorption
Аннотация:
We calculate the quasistatic electromagnetic density of states for aggregates of touching spheres, in particular, linear chains and computer-generated random
fractal
aggregates. Multipole moments with orders of up to L=64 are taken into account for random aggregates with the number of particles of up to N=100 and up to L=8000 for linear chains. Extensive comparisons with the dipole approximation and geometrical cluster renormalization method are performed. Extinction spectra are calculated for several metals and black carbon. Long wavelength electromagnetic properties of
fractal
aggregates are considered in details.
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Держатели документа:
Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA
Jackson State Univ, Dept Phys, Jackson, MS 39217 USA
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia
Krasnoyarsk State Tech Univ, Dept Phys & Engn, Krasnoyarsk 660028, Russia
Natl Acad Sci Ukraine, Inst Surface Chem, UA-03164 Kiev, Ukraine
ИФ СО РАН
Department of Radiology, University of Pennsylvania, Philadelphia, PA 19104, United States
Department of Physics, Jackson State University, Jackson, MS 39217, United States
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Moscow Inst. of Phys. and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation
Dept. of Physics, and Engineering, Krasnoyarsk State Tech. University, Krasnoyarsk 660028, Russian Federation
Institute of Surface Chemistry, Natl. Academy of Sciences of Ukraine, 17 General Naumov St., 03164 Kiev, Ukraine
Доп.точки доступа:
Markel, V. A.; Pustovit, V. N.; Karpov, S. V.; Карпов, Сергей Васильевич; Obuschenko, A. V.; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Isaev, I. L.; Исаев, Иван Леонидович
}
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5.
Enhanced raman-scattering by
fractal
clusters - scale-invariant theory / M. I. Stockman [et al.]> // Phys. Rev. B. - 1992. -
Vol. 46
,
Is. 5
. - P. 2821-2830,
DOI
10.1103/PhysRevB.46.2821. - Cited References: 22 . - ISSN 0163-1829
РУБ
Physics, Condensed Matter
Рубрики:
AGGREGATION
LIGHT
Аннотация:
A scale-invariant theory of Raman scattering of light by
fractal
clusters is developed. The enhancement factor G(RS) of Raman scattering is shown to scale in terms of a properly chosen spectral variable X. The critical indices of the enhancement factor are found to be determined by the optical spectral dimension of the
fractal
. Numerical modeling is carried out and shown to support the analytical results obtained. The theory, which does not contain any adjustable parameters, agrees well with experimental data on surface-enhanced Raman scattering over a wide spectral range.
WOS
Держатели документа:
WASHINGTON STATE UNIV,DEPT CHEM,PULLMAN,WA 99164
ONTARIO LASER & LIGHTWAVE RES CTR,TORONTO M5S 1A1,ONTARIO,CANADA
UNIV TORONTO,DEPT CHEM,TORONTO M5S 1A1,ONTARIO,CANADA
UNIV PARIS 11,CTR ORSAY,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE
RUSSIAN ACAD SCI,INST AUTOMAT & ELECTROMETRY,NOVOSIBIRSK 630090,USSR
LV KIRENSKY PHYS INST,KRASNOYARSK 660036,USSR
ИФ СО РАН
Доп.точки доступа:
Stockman, M. I.; Shalaev, V. M.; Moskovits, M.; Botet, R.; George, T. F.
}
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6.
Komogortsev, S. V.
Fractal
cluster of magnetic nanoparticles: dimensionality effect to magnetization curves / S. V. Komogortsev, V. A. Felk, R. S. Iskhakov> //
Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 5OR-O-4. - P. 1003
РИНЦ
,
Материалы конференции
,
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Доп.точки доступа:
Felk, V. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
Нет сведений об экземплярах (Источник в БД не найден)
}
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7.
Myagkov, V. G.
Fractal
clusters and self-propagating high-temperature synthesis in thin Al/Ge films / V. G. Myagkov, L. E. Bykova> // JETP Letters. - 1998. -
Vol. 67
,
Is. 5
. - P. 334-338,
DOI
10.1134/1.567669. - Cited References: 14 . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
DENSE BRANCHING MORPHOLOGY
SINGLE-CRYSTAL GROWTH
AL-GE
PHASE-SEPARATION
Аннотация:
Fractal
clusters in amorphous thin films are examples of growth models. The main models are the Witten-Sander model and its modifications. It is believed that
fractal
patterns are formed in the course of the crystallization of an amorphous phase. It is shown that self-propagating high-temperature synthesis can be initiated in an Al/Ge film system and
fractal
patterns are formed in the reaction products. It is conjectured that the transition of an amorphous phase to a crystalline phase does not play a substantial role in the appearance of such patterns, while the formation of
fractal
clusters is determined by self-propagating high-temperature synthesis. (C) 1998 American Institute of Physics. [S0021-3640(98)00605-7].
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Bykova, L. E.; Быкова, Людмила Евгеньевна; Мягков, Виктор Григорьевич
}
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8.
Komogortsev, S. V.
Fractal
Dimension Effect on the Magnetization Curves of Exchange-Coupled Clusters of Magnetic Nanoparticles / S. V. Komogortsev, R. S. Iskhakov, V. A. Fel'k> // J. Exp. Theor. Phys. - 2019. -
Vol. 128
,
Is. 5
. - P. 754-760,
DOI
10.1134/S1063776119040095. - Cited References: 54. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund under the research project no. 18-42-240006. . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
THIN-FILMS
COERCIVE FORCE
NANOCRYSTALLINE
SATURATION
FERROMAGNETS
Аннотация:
The effect of the
fractal
dimension of exchange-coupled clusters of magnetic nanoparticles on their magnetization curves is predicted by scaling estimates. These predictions form the basis for the experimental technique used for determining the
fractal
dimension of nanoparticle clusters from the magnetization curves. We estimate the reliability of determining the dimension by such methods with the help of micromagnetic simulation. It is shown that the effective dimension of magnetic correlation volumes, which is determined from analysis of the magnetization approaching saturation, is in conformity with the dimension of
fractal
clusters determined from analysis of their morphology. The dimension estimated from analysis of the coercive field on the particle size in a physically natural situation of the dipole-dipole interaction between nanoparticles provides estimates of the cluster dimension, which strongly differs from estimates obtained from analysis of their morphology.
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Публикация на русском языке
Комогорцев, Сергей Викторович. Влияние фрактальной размерности на кривую намагничивания обменно-связанного кластера магнитных наночастиц [Текст] / С. В. Комогорцев, Р. С. Исхаков, В. А. Фельк // Журн. эксперимент. и теор. физ. - 2019. - Т. 155 Вып. 5. - С. 886-893
Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660049, Russia.
Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Fel'k, V. A.; Комогорцев, Сергей Викторович; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [18-42-240006]
}
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9.
Fractal
dimension of
cluster boundaries in porous polycrystalline HTSC materials / A. A. Bykov [et al.]> // Phys. Solid State. - 2012. -
Vol. 54
,
Is. 10
. - P. 1947-1950,
DOI
10.1134/S1063783412100095. - Cited References: 20 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
ELECTRICAL-CONDUCTIVITY
PERCOLATION
MIXTURES
MEDIA
SUPERCONDUCTORS
TRANSPORT
SPHERES
Аннотация:
The
fractal
dimension of the boundaries of clusters formed by pores and granules in polycrystalline materials is shown to be determined by the sample density and crystallite sizes. The dependence of the
fractal
dimension on the density has a maximum. It is shown that the maximum diamagnetic response can be obtained in a porous high-temperature superconductor with a porosity of 50-60% and small crystallite sizes.
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Публикация на русском языке
Фрактальная размерность границ кластеров в пористых поликристаллических ВТСП-материалах [Текст] / А. А. Быков [и др.] // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 10. - С. 1825-1828
Держатели документа:
[Bykov, A. A.
Terent'ev, K. Yu.
Gokhfeld, D. M.
Petrov, M. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Bykov, A. A.; Быков, Алексей Анатольевич; Terent'yev, K. Yu.; Терентьев, Константин Юрьевич; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
}
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10.
Fractal
magnetic correlations
in the nanostructured CoPt particles / R. S. Iskhakov [et al.]> //
VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P9.33. - P. 424. - This work was supported by the Russian Foundation for Basic Research, Grants No. 16-03-00256, 15-08-06673 and RFBR-KRFS 15-42-0417 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
magnetic nanoparticles
--
magnetic correlations
--
nanostructures
Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Yurkin, G. Yu.; Юркин, Глеб Юрьевич; Eremin, E. V.; Еремин, Евгений Владимирович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
Нет сведений об экземплярах
}
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11.
Fractal
Magnetic Microstructure
in the (Co41Fe 39B20)X(SiO2)1-x Nanocomposite Films [Text] / R. S. Iskhakov, S. V. Komogortsev, E. A. Denisova [et al.]> // JETP LETTERS. - 2007. -
Т.86
,
вып.7
. - P465-469
DOI
10.1134/S0021364007190083
РИНЦ
,
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Версия на русском языке
Фрактальная магнитная микроструктура в пленках нанокомпозитов (Co41Fe39B20)x(SiO2)1-x [Текст] / Р. С. Исхаков, С. В. Комогорцев, Е. А. Денисова [и др.] // Письма в ЖЭТФ. - 2007. - Т. 86 Вып. 7. - С. 534-538
Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036
Voronezh State Technical University, Moskovskii pr. 14
Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Denisova, E. A.; Денисова, Елена Александровна; Kalinin, Yu. E.; Sitnikov, A. V.
}
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12.
Gluck, M.
Fractal
stabilization of Wannier-Stark resonances / M. . Gluck, A. R. Kolovsky, H. J. Korsch> // Europhys. Lett. - 2000. -
Vol. 51
,
Is. 3
. - P. 255-260,
DOI
10.1209/epl/i2000-00345-2. - Cited References: 17 . - ISSN 0295-5075
РУБ
Physics, Multidisciplinary
Рубрики:
BLOCH PARTICLE
FIELDS
STATISTICS
QUANTUM
SYSTEMS
AC
DC
ELECTRONS
Аннотация:
The quasienergy spectrum of a Bloch electron affected by dc-ac fields is known to have a
fractal
structure as a function of the so-called electric matching ratio, which is the ratio of the ac field frequency and the Bloch frequency. This paper studies a manifestation of the
fractal
nature of the spectrum in the system "atom in a standing laser wave", which is a quantum-optical realization of a Bloch electron. It is shown that for an appropriate choice of the system parameters the atomic survival probability (a quantity measured in laboratory experiments) also develops a
fractal
structure as a function of the electric matching ratio. Numerical simulations under classically chaotic scattering conditions show good agreement with theoretical predictions based on random matrix theory.
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Держатели документа:
Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Fachbereich Physik, Universitat Kaiserslautern, D-67653 Kaiserslautern, Germany
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Kolovsky, A. R.; Коловский, Андрей Радиевич; Korsch, H. J.
}
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13.
Butenko, A. V.
Giant impurity nonlinearities in optics of
fractal
clusters / A. V. Butenko, V. M. Shalayev, M. I. Stockman> // Zhurnal |Eksperim. Teor. Fiz. - 1988. -
Vol. 94
,
Is. 1
. - P. 107-124. - Cited References: 12 . - ISSN 0044-4510
РУБ
Physics, Multidisciplinary
WOS
Держатели документа:
LV KIRENSKII PHYS INST,KRASNOYARSK,USSR
KRASNOYARSK STATE UNIV,KRASNOYARSK,USSR
ИФ СО РАН
Доп.точки доступа:
Shalayev, V. M.; Шалаев, Владимир Михайлович; Stockman, M. I.; Бутенко, Андрей Викторович
}
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14.
Local anisotropy and
giant enhancement of local electromagnetic fields in
fractal
aggregates of metal nanoparticles / S. V. Karpov [et al.]> // Phys. Rev. B. - 2005. -
Vol. 72
,
Is. 20
. - Ст. 205425,
DOI
10.1103/PhysRevB.72.205425. - Cited References: 56 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
SMALL-PARTICLE COMPOSITES
DIFFUSION-LIMITED AGGREGATION
OPTICAL-PROPERTIES
SELECTIVE PHOTOMODIFICATION
NUMERICAL-SIMULATION
DISORDERED CLUSTERS
ABSORPTION-SPECTRUM
PARTICULATE MATTER
NONLINEAR OPTICS
LIGHT-SCATTERING
Аннотация:
We have shown within quasistatic approximation that the giant fluctuations of a local electromagnetic field in random
fractal
aggregates of silver nanospheres are strongly correlated with a local anisotropy factor S which is defined in this paper. The latter is a purely geometrical parameter which characterizes the deviation of local environment of a given nanosphere in an aggregate from spherical symmetry. Therefore, it is possible to predict the sites with anomalously large local fields in an aggregate without explicitly solving the electromagnetic problem. We have also demonstrated that the average (over nanospheres) value of S does not depend noticeably on the
fractal
dimension D, except when D approaches the trivial limit D=3. In this case, as one can expect, the average local environment becomes spherically symmetrical and S approaches zero. This corresponds to the well-known fact that in trivial aggregates, fluctuations of local electromagnetic fields are much weaker than in
fractal
aggregates. Thus, we find that, within the quasistatics, the large-scale geometry does not have a significant impact on local electromagnetic responses in nanoaggregates in a wide range of
fractal
dimensions. However, this prediction is expected not to be correct in aggregates which are sufficiently large for the intermediate- and radiation-zone interaction of individual nanospheres to become important.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Dept Phys & Engn, Krasnoyarsk 660028, Russia
Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA
Univ Penn, Dept Bioengn, Philadelphia, PA 19104 USA
ИФ СО РАН
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Department of Physics and Engineering, Krasnoyarsk State Technical University, Krasnoyarsk 660028, Russian Federation
Departments of Radiology and Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, United States
Доп.точки доступа:
Karpov, S. V.; Карпов, Сергей Васильевич; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Isaev, I. L.; Исаев, Иван Леонидович; Markel, V. A.
}
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15.
Nonlinear optics of
metallic
fractal
clusters / A. V. Butenko [et al.]> // Izvestiya Akademii Nauk SSSR Seriya Fizicheskaya. - 1989. -
Vol. 53
,
Is. 6
. - P. 1195-1201. - Cited References: 13 . - ISSN 0367-6765
РУБ
Physics, Multidisciplinary
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Держатели документа:
LV KIRENSKII PHYS INST,KRASNOYARSK,USSR
ИФ СО РАН
Доп.точки доступа:
Butenko, A. V.; Danilova, Y. E.; Ishikaev, S. M.; Karpov, S. V.; Карпов, Сергей Васильевич; Popov, A. K.; Попов, Александр Кузьмич; Rautian, S. G.; Safonov, V. P.; Slabko, V. V.; Слабко, Виталий Васильевич; Crubakov, P. A.; Shalaev, V. M.; Shtokman, M. I.
}
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16.
Numerical studies of
second- and fourth-order correlation functions in cluster-cluster aggregates in application to optical scattering / V. A. Markel [et al.]> // Phys. Rev. E. - 1997. -
Vol. 55
,
Is. 6
. - P. 7313-7333,
DOI
10.1103/PhysRevE.55.7313. - Cited References: 21 . - ISSN 1063-651X
РУБ
Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
DIFFUSION-LIMITED AGGREGATION
COLLOIDAL AGGREGATION
FRACTAL
CLUSTERS
ANTICORRELATION
SIMULATIONS
Аннотация:
Two- and four-point density correlation functions p(2)(r) and p(4)(r) are studied numerically and theoretically in computer-generated three-dimensional lattice cluster-cluster aggregates (CCA) with the number of particles N up to 20 000 in application to the light scattering problem. The ''pure'' aggregation algorithm is used, where subclusters of all possible sizes are allowed to collide. We find that large CCA clusters demonstrate pronounced multiscaling. In particular, the
fractal
dimension determined from the slope of p(2)(r) at small distances differs from that found from the dependence of the radius of gyration on the number of monomers (according to our data, 1.80 and 1.94, respectively). We also consider different functional forms for p(2) and their general properties and applicability. We find that the best fit to the numerical data is provided by the generalized exponential cutoff function with coefficients depending on N. The latter dependence is a manifestation of multiscaling. We propose some theoretical approaches for calculating p(4)(r), assuming p(2)(r) is known. In particular, we find the small-r asymptote for the p(4)(r) and verify it numerically. In addition, we find that p(4)(r) cannot be represented by a scaling dependence with a cutoff function, like p(2)(r) Instead, p(4)(r) is given by an expansion in terms of integer powers of r(2D-3), where D is the
fractal
dimension (approximate to 1.8 for CCA clusters).
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Держатели документа:
UNIV WISCONSIN,DEPT CHEM,OFF CHANCELLOR,STEVENS POINT,WI 54481
UNIV WISCONSIN,DEPT PHYS & ASTRON,STEVENS POINT,WI 54481
RUSSIAN ACAD SCI,INST AUTOMAT & ELECTROMETRY,NOVOSIBIRSK 630090,RUSSIA
RUSSIAN ACAD SCI,SIBERIAN BRANCH,LV KIRENSKY PHYS INST,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН
Доп.точки доступа:
Markel, V. A.; Shalaev, V. M.; Poliakov, E. Y.; George, T. F.
}
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17.
Karpov, S. V.
Photochromic reactions in silver nanocomposites with a
fractal
structure and their comparative characteristics / S. V. Karpov, A. K. Popov, V. V. Slabko> // Tech. Phys. - 2003. -
Vol. 48
,
Is. 6
. - P. 749-756,
DOI
10.1134/1.1583830. - Cited References: 24 . - ISSN 1063-7842
РУБ
Physics, Applied
Рубрики:
SMALL-PARTICLE COMPOSITES
OPTICAL-PROPERTIES
COLLOIDAL SILVER
SELECTIVE PHOTOMODIFICATION
CLUSTERS
LIGHT
Аннотация:
Conditions for a change in the polarization selectivity of dips in the plasmon absorption spectra of
fractal
silver nanocomposites irradiated by pulsed laser radiation are studied. The energy thresholds of the polarization selectivity are evaluated, and the polarization and spectral threshold characteristics are compared. Mechanisms behind the correlation between the
fractal
structure of the nanocomposites, on the one hand, and their optical and photochromic properties, on the other hand, are discussed. (C) 2003 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Krasnoyarsk Stt. Tech. University, Krasnoyarsk 660074, Russian Federation
Доп.точки доступа:
Popov, A. K.; Slabko, V. V.; Слабко, Виталий Васильевич; Карпов, Сергей Васильевич
}
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18.
Processes in resonant
domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields / A. P. Gavrilyuk, S. V. Karpov> // Appl. Phys. B-Lasers Opt. - 2009. -
Vol. 97
,
Is. 1
. - P163-173,
DOI
10.1007/s00340-009-3592-y. - Cited Reference Count: 43. - Гранты: Authors are thankful to Prof. V. A. Markel ( University of Pennsylvania) for computation of multipole polarizability of silver nanoparticle bispheres, for the attention to this paper, fruitful discussions and great support. This research was supported by grants: 27.1 of the Presidium of RAS, 9.1 DPS RAS, 5 SB RAS, 3818.2008.3 and 6612.2006.3 of the President of RF ( SS RAS), DSP 2.1.1.1814, 05- 03- 32642 RFBR. - Финансирующая организация: [27.1 of the Presidium of RAS]; [9.1 DPS RAS]; [5 SB RAS]; [3818.2008.3]; [6612.2006.3] . - SEP. - ISSN 0946-2171
Рубрики:
SMALL-PARTICLE COMPOSITES
FRACTAL
CLUSTERS
SELECTIVE PHOTOMODIFICATION
ABSORPTION-COEFFICIENTS
REFRACTIVE-INDEXES
SILVER
ENHANCEMENT
RESPONSES
GOLD
Кл.слова (ненормированные):
Metal nanoparticles
--
Nanosecond pulsed laser
--
Nonlinear refractive index
--
Optical nonlinearity
--
Physical effects
--
Pulsed-laser field
--
Resonant domain
--
Silver nanoparticles
--
Simple Physical Models
--
Aggregates
--
Laser excitation
--
Nanoparticles
--
Nonlinear optics
--
Organic polymers
--
Pulsed laser applications
--
Refractive index
--
Silver
Аннотация:
Optical nonlinearities in aggregates of nanoparticles formed in silver hydrosols (SHs) are studied under pico- and nanosecond pulsed laser excitation. The dependence of the nonlinear refractive index n (2) on the degree of hydrosol aggregation is studied experimentally at the wavelength lambda=1.064 mu m. It is found that n (2) changes sign when the degree of hydrosol aggregation is increased. Various physical effects occurring in resonant domains of the aggregates are analyzed using a simple physical model of two bound silver nanoparticles. The theory takes into account thermal, elastic, electrostatic, and light-induced effects. Experimental results are discussed in the context of this theory.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660028, Russia
Доп.точки доступа:
Gavrilyuk, A. P.; Гаврилюк, Анатолий Петрович; Karpov, S. V.; Карпов, Сергей Васильевич
}
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19.
Sshalaev, V. M.
Resonant light-scattering by
fractal
clusters / V. M. Sshalaev, R. Botet, R. Jullien> // Phys. Rev. B. - 1991. -
Vol. 44
,
Is. 22
. - P. 12216-12225,
DOI
10.1103/PhysRevB.44.12216. - Cited References: 19 . - ISSN 0163-1829
РУБ
Physics, Condensed Matter
Рубрики:
AEROGELS
OPTICS
Аннотация:
A scale-invariant theory of resonant Rayleigh scattering by
fractal
clusters is developed. Our main result is that the scattering cross section is greatly enhanced, because of the presence of very high local fields, which are correlated and strongly fluctuating. Simulations dealing with two examples of
fractal
structures, namely, random walk and cluster-cluster aggregates, are presented. The numerical results confirm the theoretical predictions of the scaling behavior for both absorption and scattering, and allow us to obtain the corresponding exponents. In addition to the results for scattering, the large scale of the simulations of the present work provides a comprehensive confirmation and a substantial extension of a recent study by Markel, Muratov, Stockman, and George [Phys. Rev. B 43, 8183 (1991)].
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Держатели документа:
UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY
LV KIRENSKY PHYS INST,KRASNOYARSK,USSR
UNIV PARIS 11,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE
ИФ СО РАН
Доп.точки доступа:
Botet, R.; Jullien, R.
}
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20.
Shalaev, V. M.
Small-particle composites .2. Nonlinear optical properties / V. M. Shalaev, E. Y. Poliakov, V. A. Markel> // Phys. Rev. B. - 1996. -
Vol. 53
,
Is. 5
. - P. 2437-2449,
DOI
10.1103/PhysRevB.53.2437. - Cited References: 45 . - ISSN 0163-1829
РУБ
Physics, Condensed Matter
Рубрики:
FRACTAL
CLUSTERS
RAMAN-SCATTERING
SUSCEPTIBILITY
CONDUCTIVITY
EXCITATIONS
COLLOIDS
LIGHT
Аннотация:
Strong fluctuations of local fields may result in very large optical nonlinearities in small-particle composites. Enhancement associated with particle clustering is found for a number of optical processes, including four-wave mixing (FWM), third-harmonic generation (THG), Raman scattering, and nonlinear refraction and absorption in Kerr media. Field fluctuations and optical nonlinear susceptibilities are especially large in
fractal
clusters. The enhancement of optical processes is expressed in terms of the resonant linear absorption by collective dipolar eigenmodes in a cluster, and quality factors, q, of the modes (q much greater than 1). It is shown that the susceptibility of a composite material consisting of random small-particle clusters is proportional to q(3) for Raman scattering and the Kerr optical nonlinearity, and to q(4) and q(6) for THG and FWM, respectively. For all of these processes, a spectral dependence of the effective susceptibility is found. Broad-scale numerical simulations of the optical response in small-particle composites are performed to complement the theory. The simulations are in reasonable agreement with available experimental data.
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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
RUSSIAN ACAD SCI,INST AUTOMAT & ELECTROMETRY,NOVOSIBIRSK 630090,RUSSIA
ИФ СО РАН
Доп.точки доступа:
Poliakov, E. Y.; Markel, V. A.
}
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