97 research outputs found
Vector mixed-gap surface solitons
We elucidate the properties of mixed-gap vector surface solitons supported by
the interface between a uniform medium and an optical lattice imprinted in a
Kerr-type nonlinear media. The components of such mixed-gap solitons emerge
from different gaps of lattice spectrum and their mutual trapping results in
the formation of stable vector states. The unstable soliton component is
stabilized by the cross-coupling with the stable component. We show that vector
mixed-gap surface solitons exhibit a new combination of properties of vectorial
surface waves and gap solitons.Comment: 7 pages, 4 figures, to appear in Optics Expres
Nonlinearity-mediated soliton ejection from trapping potentials in nonlocal media
We address the properties of optical solitons in thermal nonlinear media with
a local refractive index defect that is capable to trap solitons launched even
close to the sample boundary despite the boundary-mediated forces that tend to
deflect all beams toward the center of the sample. We show that while such
forces become more pronounced with increasing the input beam power the defect
can trap only light below a critical power above which solitons are ejected.
The dynamics of soliton ejection and the subsequent propagation may be
controlled.Comment: 15 pages, 3 figures, to appear in Phys. Rev.
Twin-vortex solitons in nonlocal nonlinear media
We consider soliton formation in thermal nonlinear media bounded by
rectangular cross-sections and uncover a new class of nonlinear stationary
topological state. Specifically, we find that stationary higher-order vortex
states in standard shapes do not exist, but rather they take the form of
multiple, spatially separated single-charge singularities nested in an
elliptical beam. Double-charge states are found to be remarkably robust despite
their shape asymmetry and the phase-singularity splitting. States with higher
topological charges are found to be unstable.Comment: 12 pages, 4 figures, to appear in Optics Letter
Stability of Multipole-mode Solitons in Thermal Nonlinear Media
We study the stability of multipole-mode solitons in one-dimensional thermal
nonlinear media. We show how the sample geometry impacts the stability of
mutlipole-mode solitons and reveal that the tripole and quadrupole can be made
stable in their whole domain of existence, provided that the sample width
exceeds a critical value. In spite of such geometry-dependent soliton
stability, we find that the maximal number of peaks in stable multipole-mode
solitons in thermal media is the same as that in nonlinear materials with
finite-range nonlocality.Comment: 16 pages, 4 figures, to appear in Phys. Rev.
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