Delay-induced excitability.
We analyze the stochastic dynamics of a bistable system under the influence of time-delayed feedback. Assuming an asymmetric potential, we show the existence of a regime in which the system dynamics displays excitability by calculating the relevant residence time distributions and power spectra. Experimentally we then observe this behavior in the polarization dynamics of a vertical cavity surface emitting laser with optoelectronic feedback. Extending these observations to two-dimensional systems with diffusive coupling, we finally show numerically that delay-induced excitability can lead to the appearance of propagating wave fronts and spirals.
Piwonski
Tomasz
T
Physics Department, National University of Ireland, University College Cork.
Houlihan
John
J
Busch
Thomas
T
Huyet
Guillaume
G
D005246:Feedback; D008962:Models, Theoretical; D013269:Stochastic Processes