Phase twisted modes and current reversals in a lattice model of waveguide arrays with nonlinear coupling.
We consider a lattice model for waveguide arrays embedded in nonlinear Kerr media. Inclusion of nonlinear coupling results in many phenomena involving complex, phase-twisted, stationary modes. The norm (Poynting power) current of stable plane-wave solutions can be controlled in magnitude and direction, and may be reversed without symmetry-breaking perturbations. Also stable localized phase-twisted modes with zero current exist, which for particular parameter values may be compact and expressed analytically. The model also describes coupled Bose-Einstein condensates.
Oster
Michael
M
Department of Physics and Measurement Technology (IFM), Linköping University, S-581 83 Linköping, Sweden. micos@ifm.liu.se
Johansson
Magnus
M