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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Landau-Zener tunnelling in 2D periodic structures in the presence of a gauge field: I. Tunnelling rates
Место публикации : J. Phys. B. - 2013. - Vol. 46, Is. 14. - Ст.145301. - P. - ISSN 0953-4075, DOI 10.1088/0953-4075/46/14/145301
Примечания : Cited References: 48. - The authors acknowledge financial support of Russian Academy of Sciences through the SB RAS integration project no. 29 Dynamics of atomic Bose-Einstein condensates in optical lattices and the Russian Foundation for Basic Research (RFBR) project no. 12-02-00094 Tunneling of the macroscopic quantum states.
Предметные рубрики: OPTICAL BLOCH OSCILLATIONS
WANNIER-STARK STATES
MAGNETIC-FIELDS
NEUTRAL ATOMS
COLD ATOMS
LATTICES
ELECTRONS
ARRAYS
Аннотация: We study the interband Landau-Zener tunnelling of a quantum particle in the Hall configuration, i.e., in the presence of gauge field (for example, magnetic field for a charged particle) and in-plane potential field (electric field for a charged particle) normal to the lattice plane. The interband tunnelling is induced by the potential field and for the vanishing gauge field is described by the common Landau-Zener theory. We generalize this theory for a nonzero gauge field. The depletion rates of low-energy bands are calculated by using a semi-analytical method of the truncated Floquet matrix.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rasskazov I. L., Karpov S. V., Markel V. A.
Заглавие : Surface plasmon polaritons in curved chains of metal nanoparticles
Коллективы : US National Science Foundation [DMS1216970]; Russian Academy of Sciences [24.29, 24.31, III. 9.5, 43, SFU (101)]; Russian Ministry of Education and Science [1792]
Место публикации : Phys. Rev. B: American Physical Society, 2014. - Vol. 90, Is. 7. - Ст.75405. - ISSN 1098-0121, DOI 10.1103/PhysRevB.90.075405. - ISSN 1550-235X
Примечания : Cited References: 34. - This research was supported in part by the US National Science Foundation under Grant DMS1216970, by the Russian Academy of Sciences under the Grants 24.29, 24.31, III. 9.5, 43, SFU (101), and also by the Russian Ministry of Education and Science under the Contract 1792.
Предметные рубрики: LINEAR-CHAINS
DISPERSION-RELATIONS
ARRAYS
RESONANCES
FIELD
Аннотация: We investigate numerically the propagation of steady-state monochromatic surface plasmon polaritons (SPPs) in curved chains of metal nanoparticles of various spheroidal shapes. We discuss the SPP propagation (decay of the amplitude), the polarization conversion due to coupling of orthogonally polarized SPPs, and the electromagnetic field localization in the near-field vicinity of a chain.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rasskazov I. L., Karpov S. V., Markel V. A.
Заглавие : Waveguiding properties of short linear chains of nonspherical metal nanoparticles
Коллективы : U.S. National Science Foundation [DMS1216970]; Russian Academy of Sciences [24.29, 24.31, III.9.5, 43]; SFU [101]; Russian Ministry of Education and Science [1792]
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2014. - Vol. 31, Is. 12. - P.2981-2989. - ISSN 0740-3224, DOI 10.1364/JOSAB.31.002981. - ISSN 1520-8540
Примечания : Cited References: 39. - This research was supported in part by the U.S. National Science Foundation under Grant DMS1216970; by the Russian Academy of Sciences under Grants 24.29, 24.31, III.9.5, 43, and SFU (101); and by the Russian Ministry of Education and Science under Contract 1792.
Предметные рубрики: DISPERSION-RELATIONS
MODES
SCATTERING
ARRAYS
GUIDES
LIGHT
GAIN
Аннотация: We study numerically the discrete dispersion relations and waveguiding properties of relatively short linear chains of spherical and spheroidal silver nanoparticles. Simulations are based on the Drude model for the dielectric permittivity of metal and on the dipole approximation for the electromagnetic interaction of particles. We also simulate the dynamics of femtosecond optical pulse propagation along such chains. In the case that we consider (10 particles per chain), reflections from the chain terminals play a significant detrimental role. We show that dissipative traps can be used to reduce the effects of reflections. We also show that chains composed of oblate spheroids with sufficiently small aspect ratio (nanodisks) have better waveguiding properties when compared to chains made of particles with other spheroidal shapes. This includes a slower rate of decay, larger group velocity, and larger bandwidth.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samardak A. S., Nasirpouri F., Nadi M., Sukovatitsina E. V., Ognev A. V., Chebotkevich L. A., Komogortsev S. V.
Заглавие : Conversion of magnetic anisotropy in electrodeposited Co-Ni alloy nanowires
Коллективы : Russian Ministry of Education and Science, Far Eastern Federal University, Iranian Nanotechnology Initiative Council
Место публикации : J. Magn. Magn. Mater.: ELSEVIER SCIENCE BV, 2015. - Vol. 383. - P.94-99. - ISSN 0304, DOI 10.1010/j.jmmm.2014.10.047. - ISSN 18734766(eISSN)
Примечания : Cited References:24. - This work was supported in part by the Russian Ministry of Education and Science and Far Eastern Federal University. M.N acknowledges the student financial support of Iranian Nanotechnology Initiative Council.
Предметные рубрики: COBALT NANOWIRES
ARRAYS
Ключевые слова (''Своб.индексиров.''): coercive force--magnetic anisotropy--magnetic hysteresis--binary alloy--nanowires--alumina template--electrodeposition
Аннотация: In this paper, the influence of alternating current (ac) electrodeposition frequency and waveform is reported on chemical composition, microstructure and consequently magnetic properties of Co-Ni binary alloy nanowire arrays embedded in an alumina template. For sinusoidal and square electrodeposition waveforms the easy axis of magnetization rotates from being parallel to perpendicular orientation to nanowire long axis as the deposition frequency increases from 200 to 800 Hz. The reason for the drastic change of magnetic anisotropy in nanowires is attributed to the increase of cobalt content and the crystal structure phase transformation from fcc-hcp mixture at high Ni content to imp at high Co content. We explain the conversion of magnetic behavior of nanowire arrays in terms of a competition between the shape and magnetocrystalline anisotropies. (C) 2014 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rasskazov I. L., Karpov S. V., Panasyuk G. Y., Markel V. A.
Заглавие : Overcoming the adverse effects of substrate on the waveguiding properties of plasmonic nanoparticle chains
Место публикации : J. Appl. Phys.: American Institute of Physics, 2016. - Vol. 119, Is. 4. - Ст.043101. - ISSN 00218979 (ISSN), DOI 10.1063/1.4940415
Примечания : Cited References: 43. - This work has been carried out thanks to the support of the A*MIDEX project (No. ANR-11-IDEX-0001-02) funded by the “Investissements d'Avenir” French Government program, managed by the French National Research Agency (ANR) and was also supported in part by the U.S. National Science Foundation under Grant No. DMS1216970 and by the Ministry of Education and Science of the Russian Federation under Contract No. 1792.
Предметные рубрики: LINEAR-CHAINS
DISPERSION-RELATIONS
ARRAYS
RESONANCES
GUIDES
NANOSPHERES
MODES
FIELD
POLARITONS
PARTICLES
Аннотация: We have studied numerically the propagation of surface plasmon polaritons (SPPs) in linear periodic chains of plasmonic nanoparticles of different shapes. The chains are deposited on top of a thick dielectric substrate. While in many commonly considered cases the substrate tends to suppress the SPP propagation, we have found that this adverse effect is practically absent in the case when the nanoparticles have the shape of oblate spheroids with sufficiently small aspect ratio (e.g., nanodisks) whose axes of symmetry coincide with the axis of the chain. © 2016 AIP Publishing LLC.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivchenko E. L., Voronov M. M., Erementchouk M. V., Deych L. I., Lisyansky A. A.
Заглавие : Multiple-quantum-well-based photonic crystals with simple and compound elementary supercells
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2004. - Vol. 70, Is. 19. - Ст.195106. - ISSN 1098-0121, DOI 10.1103/PhysRevB.70.195106
Примечания : Cited References: 33
Предметные рубрики: EXCITON POLARITONS
DIELECTRIC MEDIUM
OPTICAL LATTICES
BRAGG STRUCTURES
BAND-STRUCTURES
PERIODIC-BRAGG
REFLECTION
ABSORPTION
SPECTRA
ARRAYS
Ключевые слова (''Своб.индексиров.''): article--crystal--crystal structure--elementary particle--light scattering--mathematical analysis
Аннотация: Exciton polaritons in one-dimensional photonic crystals based on multiple quantum well structures are investigated. The effects due to interplay between resonant interaction of light with quantum well excitons, and light scattering from well-barrier interface, are elucidated. Polariton dispersion equations and reflection spectra in structures with two wells in an elementary supercell of the periodic structure are studied. Several examples of different compound elementary supercells are considered. Special attention is paid to structures with the period or the distance between quantum wells satisfying the resonance Bragg condition. Such structures are characterized by a presence of a larger-than-usual polariton stop band. It is shown that in structures with a complex elementary supercell, the width of such a stop band can be significantly enhanced in comparison to that in simple structures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Komogortsev S. V., Balaev A. D., Okotrub A. V., Kudashov A. G., Kuznetsov V. L., Butenko Y. V.
Заглавие : Fe nanowires in carbon nanotubes as an example of a one-dimensional system of exchange-coupled ferromagnetic nanoparticles
Место публикации : JETP Letters. - 2003. - Vol. 78, Is. 4. - P.236-240. - ISSN 0021-3640, DOI 10.1134/1.1622038
Примечания : Cited References: 38
Предметные рубрики: MAGNETIC-PROPERTIES
RANDOM ANISOTROPY
ELECTRODEPOSITED NANOWIRES
NI NANOWIRES
ARRAYS
NANOCRYSTALLINE
ALUMINA
NICKEL
PORES
STATE
Аннотация: The cooperative phenomena revealed in the field and temperature dependences of the magnetization in a system of iron nanoparticles in carbon nanotubes were studied experimentally. The character of the temperature dependences of the magnetization indicates that the ferromagnetic Fe particles in carbon nanotubes are exchange-coupled. In the region where the magnetization approaches saturation, the magnetization curves reveal the power dependence DeltaM similar to H-3/2 typical for a one-dimensional system of exchange-coupled ferromagnetic nanoparticles. (C) 2003 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Scattering plane waves by a dielectric cylinder with periodically modulated permittivity at oblique incidence
Коллективы : Ministry of Education and Science of Russian Federation [3.1845.2017]; Russian Foundation for Basic Research [16-02-00314]
Место публикации : Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст.063856. - ISSN 2469-9926, DOI 10.1103/PhysRevA.97.063856. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 24. - We acknowledge discussions with A. A. Bogdanov and D. N. Maksimov. This paper was partially supported by Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017) and Russian Foundation for Basic Research Grant No. 16-02-00314.
Предметные рубрики: BOUND-STATES
FANO RESONANCE
LIGHT LINE
CONTINUUM
ARRAYS
Аннотация: For scattering of electromagnetic waves by a dielectric cylinder with periodically modulated permittivity we focus on the vicinity of the frequency of the wave with regard to the eigenfrequencies of bound states in the continuum. Then response of the cylinder becomes extremely sensitive to the angle of incidence and polarization of the plane wave. The cross section of the scattering of electromagnetic waves with mixed polarization undergoes crucial change from the Bragg shape to the Fano shape by rotation of the polarization that paves a way to tuning of Fano resonances by an external source.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Fibers based on propagating bound states in the continuum
Коллективы : Ministry of Education and Science of Russian Federation [3.1845.2017]; RFBR [16-02-00314, 17-52-45072]
Место публикации : Phys. Rev. B. - 2018. - Vol. 98, Is. 8. - Ст.085301. - ISSN 2469-9950, DOI 10.1103/PhysRevB.98.085301. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 40. - The authors thank D. N. Maksimov for assistance and discussions. This work was partially supported by the Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017) and the RFBR Grants No. 16-02-00314 and No. 17-52-45072.
Предметные рубрики: PHOTONIC CRYSTAL SLABS
LIGHT
RESONANCES
RADIATION
ARRAYS
Аннотация: We show that a circular periodic array of silicon dielectric cylinders supports nearly bound states in the continuum (BICs) propagating along the cylinders. These propagating nearly BICs with extremely large-Q factors are surrounded by resonant modes weakly leaking into the radiation continuum. We present leaky zones in the form of dispersion curves for complex eigenfrequencies dependent on propagation constant kz, with the wave vector directed along the cylinders in the vicinity of different types of BICs. Symmetry-protected nearly BICs have the resonant width proportional to squared propagation constant Γ∼k2z; the widths of non-symmetry-protected nearly BICs behave as Γ∼(kz−kc)2, where kc and non-symmetry-protected nearly BICs have the resonant width proportional to k4z. The latter propagating nearly BICs can serve for the transmission of a electromagnetic signal paving a way to a different type of optical fiber. We also demonstrate weakly leaking resonant modes which carry orbital angular momentum.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Bogdanov A. A., Bulgakov E. N.
Заглавие : Optical bistability with bound states in the continuum in dielectric gratings
Коллективы : Government of the Russian Federation through the ITMO Fellowship; Ministry of Science and Higher Education of Russian Federation, goszadanie [2019-1246]; RFBRRussian Foundation for Basic Research (RFBR) [18-32-20205]
Место публикации : Phys. Rev. A. - 2020. - Vol. 102, Is. 3. - Ст.033511. - ISSN 2469-9926, DOI 10.1103/PhysRevA.102.033511. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 53. - This work was financially supported by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program. A.A.B. also acknowledges support by the Ministry of Science and Higher Education of Russian Federation, goszadanie No. 2019-1246 and RFBR (18-32-20205)
Предметные рубрики: COUPLED-MODE THEORY
WAVE-GUIDE
TRANSITION
RESONANCE
ARRAYS
Аннотация: We consider light scattering by dielectric gratings supporting optical bound states in the continuum. Due to the presence of instantaneous Kerr nonlinearity critical field enhancement in the spectral vicinity of the bound state triggers the effect of optical bistability. The onset of bistability is explained theoretically in the framework of the temporal coupled-mode theory. As the central result we cast the problem in the form of a single field-driven nonlinear oscillator. The theoretical results are verified in comparison with numerical simulations.
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