The light ray of a spatial soliton in an optical film whose refractive index is smoothly modulated (wavelength much larger than the typical soliton width) in both spatial directions is shown to possess chaotic regimes for which the propagation is erratic. This is interpreted as a parametric driven pendulum, obtained by what we believe to be a new perturbative approach of the Maxwell’s equation. These findings are then demonstrated to compare well to the eikonal law of light ray propagation (nonlinearity compensates diffraction).
© 2009 Optical Society of America
Original Manuscript: July 7, 2009
Revised Manuscript: September 17, 2009
Manuscript Accepted: September 24, 2009
Published: October 28, 2009
R. Khomeriki and J. Leon, "Chaotic spatial soliton rays in smooth two-dimensional optical lattices," Opt. Lett. 34, 3376-3378 (2009)