5,415 research outputs found
Ultrafast response of surface electromagnetic waves in an aluminum film perforated with subwavelength hole arrays
The ultrafast dynamics of surface electromagnetic waves photogenerated on
aluminum film perforated with subwavelength holes array was studied in the
visible spectral range by the technique of transient photomodulation with 100
fs time resolution. We observed a pronounced blueshift of the resonant
transmission band that reveals the important role of plasma attenuation in the
optical response of nanohole arrays. The blueshift is inconsistent with
plasmonic mechanism of extraordinary transmission and points to the crucial
role of interference in the formation of transmission bands. The transient
photomodulation spectra were successfully modeled within the Boltzmann equation
approach for the electron-phonon relaxation dynamics, involving non-equilibrium
hot electrons and quasi-equilibrium phonons.Comment: 4 pages, 3 figure
On Collective Properties of Dense QCD Matter
A short review of the two recently analyzed collective effects in dense
non-Abelian matter, the photon and dilepton production in nonequilibrium glasma
and polarization properties of turbulent Abelian and non-Abelian plasmas, is
given.Comment: 3 figure
Multifragmentation and nuclear phase transitions (liquid-fog and liquid-gas)
Thermal multifragmentation of hot nuclei is interpreted as the nuclear
liquid-fog phase transition. The charge distributions of the intermediate mass
fragments produced in p(3.6 GeV) + Au and p(8.1 GeV) + Au collisions are
analyzed within the statistical multifragmentation model with the critical
temperature for the nuclear liquid-gas phase transition Tc as a free parameter.
The analysis presented here provides strong support for a value of Tc > 15 MeV.Comment: 4 pages, 2 figures, Submittet to Proc. of NN2003 to be published in
Nucl. Phys.
Multifragmentation in Collisions of 4.4gev-Deuterons with Gold Target
The relative velocity correlation function of pairs of intermediate mass
fragments has been studied for d+Au collitions at 4.4 GeV. Experimental
correlation functions are compared to that obtained by multibody Coulomb
trajectory calculations under the assumption of various decay timees of the
fragmenting system. The combined approach with the empirically modified
intranuclear cascade code followed by the statistical multifragmentation model
was used to generate the starting conditions for these calculations. The
fragment emossion time is found to be less than 40 fm/c.Comment: Accepted for publication in Bulletin of the Russian Academy of
Sciences. Physic
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