It is shown that discrete self-focusing may be realized in an array of coupled defocusing nonlinear waveguides. Strongly localized self-focusing patterns are found, and it is pointed out that stable beam propagation corresponds to the case in which the electric field is equivalently distributed between two neighboring waveguides with relative phase difference π.
© 1993 Optical Society of America
Yuri S. Kivshar, "Self-localization in arrays of defocusing waveguides," Opt. Lett. 18, 1147-1149 (1993)