Summary
the 2014 International Symposium on Nonlinear Theory and its Applications
2014
Session Number:C3L-E
Session:
Number:C3L-E1
Two-dimensional optical bistable device with external feedback for pulse propagation and spatio-temporal instability
Takashi ISOSHIMA, Yoshihiro ITO,
pp.625-628
Publication Date:2014/9/14
Online ISSN:2188-5079
Summary:
A bistable device with a spatial expanse can present traveling wavefront at which regions in different stable states (ex. "on" and "off" states) are adjacent to each other. We have reported that a two-dimensional optical bistable device (2DOBD) is one of such devices, and the wavefront propagation can be controlled by the irradiated light intensity. Utilizing expansion and reduction modes of the wavefront propagation, maze exploration was demonstrated by numerical simulation. In this paper, we introduce external feedback to 2DOBD to realize more complexed spatio-temporal behavior. Refractory feedback, which mimics refractory period of a neuron provides excitability, generates propagating pulses rather than traveling wavefront. Delayed feedback provides spatio-temporal instability, resulting into oscillatory and chaos-like behavior along with spontaneous spatial inhomogeneity. Such a complex spatio-temporal behavior is expected to contribute realization of natural computation.