9,331 research outputs found
Cooperative Dynamics of an Artificial Stochastic Resonant System
We have investigated cooperative dynamics of an artificial stochastic
resonant system, which is a recurrent ring connection of neuron-like signal
transducers (NST) based on stochastic resonance (SR), using electronic circuit
experiments. The ring showed quasi-periodic, tunable oscillation driven by only
noise. An oscillation coherently amplified by noise demonstrated that SR may
lead to unusual oscillation features. Furthermore, we found that the ring
showed synchronized oscillation in a chain network composed of multiple rings.
Our results suggest that basic functions (oscillation and synchronization) that
may be used in the central pattern generator of biological system are induced
by collective integration of the NST element.Comment: 13 pages, 4 figure
Polariton excitation in epsilon-near-zero slabs: transient trapping of slow light
We numerically investigate the propagation of a spatially localized and
quasi-monochromatic electromagnetic pulse through a slab with Lorentz
dielectric response in the epsilon-near-zero regime, where the real part of the
permittivity vanishes at the pulse carrier frequency. We show that the pulse is
able to excite a set of virtual polariton modes supported by the slab, the
excitation undergoing a generally slow damping due to absorption and radiation
leakage. Our numerical and analytical approaches indicate that in its transient
dynamics the electromagnetic field displays the very same enhancement of the
field component perpendicular to the slab, as in the monochromatic regime. The
transient trapping is inherently accompanied by a significantly reduced group
velocity ensuing from the small dielectric permittivity, thus providing a novel
platform for achieving control and manipulation of slow light
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