Transverse localization of light in one-dimensional waveguide arrays with width disorder has been studied in
both linear and nonlinear regimes. Defect mode is generated in the bandgap of the disordered waveguide array
when introducing refractive index modulation into a single waveguide, and its localization strength depends on
the width disorder level of the waveguide array. The evolution of the nonlinear disordered modes with either the
self-focusing or the self-defocusing optical nonlinearities has been studied. The results show that the nonlinear
disordered modes may be delocalized significantly due to the resonant interaction with the nearby eigen modes
in the width-disordered waveguide array.
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Lei Xu ; Yi Yin ; Fang Bo ; Jingjun Xu and Guoquan Zhang
Linear and nonlinear localized modes in the width-disordered one-dimensional waveguide arrays
", Proc. SPIE 8554, Quantum and Nonlinear Optics II, 855410 (November 29, 2012); doi:10.1117/12.2000578; http://dx.doi.org/10.1117/12.2000578