4,315 research outputs found
LCG MCDB -- a Knowledgebase of Monte Carlo Simulated Events
In this paper we report on LCG Monte Carlo Data Base (MCDB) and software
which has been developed to operate MCDB. The main purpose of the LCG MCDB
project is to provide a storage and documentation system for sophisticated
event samples simulated for the LHC collaborations by experts. In many cases,
the modern Monte Carlo simulation of physical processes requires expert
knowledge in Monte Carlo generators or significant amount of CPU time to
produce the events. MCDB is a knowledgebase mainly dedicated to accumulate
simulated events of this type. The main motivation behind LCG MCDB is to make
the sophisticated MC event samples available for various physical groups. All
the data from MCDB is accessible in several convenient ways. LCG MCDB is being
developed within the CERN LCG Application Area Simulation project
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
Purcell effect in wire metamaterials
We study theoretically the enhancement of spontaneous emission in wire
metamaterials. We analyze the dependence of the Purcell factor dependence on
wire dielectric constant for both electric and magnetic dipole sources, and
find an optimal value of the dielectric constant for maximizing the Purcell
factor for the electric dipole. We obtain analytical expressions for the
Purcell factor and also provide estimates for the Purcell factor in realistic
structures operating in both microwave and optical spectral range.Comment: 15 pages, 7 figure
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
Green function for hyperbolic media
We revisit the problem of the electromagnetic Green function for homogeneous
hyperbolic media, where longitudinal and transverse components of the
dielectric permittivity tensor have different signs. We analyze the dipole
emission patterns for both dipole orientations with respect to the symmetry
axis and for different signs of dielectric constants, and show that the
emission pattern is highly anisotropic and has a characteristic cross-like
shape: the waves are propagating within a certain cone and are evanescent
outside this cone. We demonstrate the coexistence of the cone-like pattern due
to emission of the extraordinary TM-polarized waves and elliptical pattern due
to emission of ordinary TE-polarized waves. We find a singular complex term in
the Green function, proportional to the function and governing the
photonic density of states and Purcell effect in hyperbolic media.Comment: 10 pages, 7 figure
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