39,324 research outputs found
Self-deflecting plasmonic lattice solitons and sur-face modes in chirped plasmonic arrays
We show that chirped metal-dielectric waveguide arrays with focusing cubic
nonlinearity can support plasmonic lattice solitons that undergo
self-deflection in the transverse plane. Such lattice solitons are
deeply-subwavelength self-sustained excitations, although they cover several
periods of the array. Upon propagation,the excitations accelerate in the
transverse plane and follow trajectories curved in the direction in which the
separation between neighboring metallic layers decreases, a phenomenon that
yields considerable deflection angles. The deflection angle can be controlled
by varying the array chirp. We also reveal the existence of surface modes at
the boundary of truncated plasmonic chirped arraythat form even in the absence
of nonlinearity.Comment: 5 pages, 6 figures, to appear in Optics Letter
Dynamical light control in longitudinally modulated segmented waveguide arrays
We address light propagation in segmented waveguide arrays where the
refractive index is longitudinally modulated with an out-of-phase modulation in
adjacent waveguides, so that the coupling strength varies along propagation
direction. Thus in resonant segments coupling may be inhibited hence light
remains localized, while in detuned segments coupling results in complex
switching scenarios that may be controlled by stacking several resonant and
nonresonant segments. By tuning the modulation frequency and lengths of
waveguide segments one may control the distribution of light among the output
guides, including loca-lizing all light in the selected output channel.Comment: 12 pages, 4 figures, to appear in Europhysics Letter
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