Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 7

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Publication available in full text mode
Content available

Dynamics of Argon Clusters in an Intense Laser Pulse: Bloch-Like Hydrodynamic Model

100%
Rusek M., Orłowski A.
Acta Physica Polonica A
|
2004
|
vol. 106
|
issue 1
3-12
EN
The dynamics of small (<55 atoms) argon clusters ionized by an intense, infrared, femtosecond laser pulse is studied using a Bloch-like hydrodynamic model. Evolution of both free electrons and ions formed in the cluster explosion process is examined. Oscillations of the electron cloud in a rare-gas atomic cluster are described as a motion of a fluid obeying Bloch-like hydrodynamic equations. Our theoretical approach includes all possible ionization mechanisms: tunnel (or field) ionization both by an external laser field, and by an internal field due to the space-charge distribution inside the cluster, as well as electron-impact (or collisional) ionization. The results of our simulations are compared both with experimental findings and with predictions of other theoretical models.
2
Publication available in full text mode
Content available

Explosion of Atom Clusters in a Free-Electron Intense Laser Pulse

100%
Rusek M., Orłowski A.
Acta Physica Polonica A
|
2004
|
vol. 105
|
issue 5
425-436
EN
The explosion of rare-gas atomic clusters induced by short, intense X-ray pulses generated by a free-electron laser is studied. A numerical approach for an explicitly time-dependent description of small to medium size clusters in 3D is developed within the Thomas-Fermi model. Such an approach, though strongly simplified in comparison to fully quantum-mechanical schemes, is nevertheless expected to yield a qualitatively correct description of the electronic and ionic dynamics of these systems, at a much lower computational cost.
3
Publication available in full text mode
Content available

Anderson Localization of Electromagnetic Waves in Dielectric Media: Model Studies

100%
Rusek M., Orłowski A.
Acta Physica Polonica A
|
2006
|
vol. 109
|
issue 1
109-119
EN
Anderson localization of electromagnetic waves in random arrays of dielectric cylinders confined within a planar metallic waveguide is studied. The disordered dielectric medium is modeled by a system of randomly distributed 2D electric dipoles. An effective theoretical approach based on the method of images is developed. A clear distinction between isolated localized waves (which exist in finite media) and the band of localized waves (which appears only in the limit of the infinite medium) is presented. The Anderson transition emerging in the limit of an infinite medium is observed both in finite size scaling analysis of transmission and in the properties of the spectra of some random matrices. The sound physical interpretation of the obtained results suggests deeper insight into the existing experimental and theoretical work.
4
Publication available in full text mode
Content available

Free Electrons Generation in the Interaction of Intense Laser Pulses with Atomic Clusters

100%
Rusek M., Orłowski A.
Acta Physica Polonica A
|
2005
|
vol. 107
|
issue 3
473-478
EN
Interaction of argon clusters with intense laser pulses is studied theoretically. Free electrons energy distribution is studied. Differences between infrared and vacuum ultraviolet frequency regimes are pointed out. Clear physical interpretation of the obtained results is given.
5
Publication available in full text mode
Content available

Light Propagation in a Magnetic Field: Random Green Matrix Approach

81%
Pinheiro F., Rusek M., Orłowski A., van Tiggelen B.
Acta Physica Polonica A
|
2004
|
vol. 105
|
issue 4
339-347
EN
We studied the spectral properties of the matrices describing multiple scattering of electromagnetic waves from randomly distributed point-like magneto-optically active scatterers under an external magnetic field B. We showed that the complex eigenvalues of these matrices exhibit some universal properties such as the self-averaging behavior of their real parts, as in the case of scatterers without magneto-optical activity. However, the presence of magneto-optically active scatterers is responsible for a striking particularity in the spectra of these matrices: the splitting of the values of the imaginary part of their eigenvalues. This splitting is proportional to the strength of the magnetic field and can be interpreted as a consequence of the Zeeman splitting of the energy levels of a single scatterer.
6
Content available remote

Light Localization in Left-Handed Media

81%
Rusek M., Orłowski A., Mostowski J.
Acta Physica Polonica A
|
2007
|
vol. 112
|
issue 4
673-680
EN
Localized waves in disordered left-handed materials are studied using a generalized coupled-dipole model. Resonances in an open system consisting of randomly distributed electric and magnetic dipoles are investigated. A new type of long-lived resonance modes localized at the boundary of the system is found. They resemble evanescent waves responsible for a superfocusing phenomenon by a left-handed lens.
7
Publication available in full text mode
Content available

Optimization of Directional Antennas in Two-Dimensional Artificial Dielectrics

81%
Janowicz M., Rusek M., Orłowski A.
Acta Physica Polonica A
|
2004
|
vol. 105
|
issue 3
263-278
EN
We investigate numerically the problem of optimization of directional characteristics of dipole antennas located inside, or in the vicinity of, photonic crystals or more general artificial dielectrics, made of very thin perfectly conducting wires. We concentrate on two-dimensional propagation. Simulated annealing is used to find the distribution of wires which optimizes the directional pattern. It is demonstrated that high directivity can be obtained for systems containing a very small number of elements provided that the size and shape of the unit cell as well as the position of the radiating source with respect to the crystal are optimized. Building up of the radiation pattern is also illustrated with the help of the wave-optical rays.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.