Midband solitons in an array of quadratically nonlinear cavities

Abstract

We predict the existence of discrete midband solitons in an array of coupled quadratically nonlinear cavities driven by an external optical field at the second harmonic. The tilted holding beam provides both subdiffractive propagation and maximum group velocity for the fundamental harmonic. This configuration allows for the existence of identical but counterpropagating midband solitons for the same system parameters. We study numerically the interaction dynamics of these solitons.