694 research outputs found
Kinetics of non-ionic surfactant adsorption at a fluid-fluid interface from a micellar solution
The kinetics of non-ionic surfactant adsorption at a fluid-fluid interface
from a micellar solution is considered theoretically. Our model takes into
account the effect of micelle relaxation on the diffusion of the free
surfactant molecules. It is shown that non-ionic surfactants undergo either a
diffusion or a kinetically limited adsorption according to the characteristic
relaxation time of the micelles. This gives a new interpretation for the
observed dynamical surface tension of micellar solutions.Comment: 4 page
Nonlinear metal-dielectric nanoantennas for light switching and routing
We introduce a novel hybrid metal-dielectric nanoantenna composed of
dielectric (crystalline silicon) and metal (silver) nanoparticles. A
high-permittivity dielectric nanoparticle allows to achieve effective light
harvesting, and nonlinearity of a metal nanoparticle controls the radiation
direction. We show that the radiation pattern of such a nanoantenna can be
switched between the forward and backward directions by varying only the light
intensity around the level of 11 MW/cm, with the characteristic switching
time of 260 fs.Comment: 9 pages, 5 figures, submitted to New J. Phy
Subwavelength modulational instability and plasmon oscillons in nanoparticle arrays
We study modulational instability in nonlinear arrays of subwavelength
metallic nanoparticles, and analyze numerically nonlinear scenarios of the
instability development. We demonstrate that modulational instability can lead
to the formation of regular periodic or quasi-periodic modulations of the
polarization. We reveal that such nonlinear nanoparticle arrays can support
long-lived standing and moving oscillating nonlinear localized modes - plasmon
oscillons.Comment: 5 pages, 5 figures, published in Physical Review Letter
Coherent X-radiation of a relativistic electron on nano-scale multilayer structure in Laue scattering geometry
The coherent X-radiation of relativistic electron crossing a periodic multilayer artificial structure is considered in Laue geometry. The expressions describing spectral-angular characteristics of the radiation are derived. The possibility of the radiation photon yield material increase with change of the asymmetry of the relativistic electron Coulomb field reflection with respect to multilayer target
entrance surface is considered
Subwavelength plasmonic kinks in arrays of metallic nanoparticles
We analyze nonlinear effects in optically driven arrays of nonlinear metallic
nanoparticles. We demonstrate that such plasmonic systems are characterized by
a bistable response, and they can support the propagation of dissipative
switching waves (or plasmonic kinks) connecting the states with different
polarization. We study numerically the properties of such plasmonic kinks which
are characterized by a subwavelength extent and a tunable velocity.Comment: 6 pages, 5 figures, published in Opt. Expres
On the ratio of the relativistic electron PXR in Bragg and forward direction within Bragg scattering geometry
In the present work, the parametric X-radiation (PXR) and the parametric radiation at a small angle relative to the velocity of a relativistic electron (FPXR) crossing a single crystal plate in Bragg scattering geometry are investigated within the framework of the dynamic X-ray diffraction theory. The expressions for spectral-angular density of the named radiations are derived in the general case of asymmetric reflection. The ratio of the contributions of these radiation mechanisms as a function of reflection asymmetry is considered in this work
Manifestation of dynamic effects in coherent X-radiation from relativistic electron in Bragg scattering geometry
Analytic expressions describing the spectral–angular distribution of parametric X-radiation (PXR) and diffracted transient radiation (DTR) of a relativistic electron traversing a single-crystal plate in the Bragg scattering geometry are derived on the basis of the two-wave approximation of the dynamic diffraction theoryyesBelgorod State Universit
Relativistic electron PXR and FPXR yield ratio
The parametric X-radiation of relativistic electron crossing a single crystal plate is considered on the basis of dynamic diffraction theory in Laue geometry both in Bragg (PXR) and forward (FPXR) directionsyesBelgorod State Universit
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