TY - JOUR A1 - Setzpfandt, Frank A1 - Sohler, Wolfgang A1 - Schiek, Roland A1 - Pertsch, Thomas T1 - Nonlinear coupling in discrete optical waveguide arrays with quadratic nonlinearity JF - Physical Review A N2 - We demonstrate nonlinear coupling in a discrete optical system. This is achieved in waveguide arrays with quadratic nonlinearity, where the symmetries of the nonlinearly interacting waveguide modes are used to suppress the usually dominating nonlinear effects within individual waveguides. We derive a mathematical model to describe the nonlinear coupling in such waveguide arrays and show experimentally the profound effects of this nonlinear coupling mechanism on second-harmonic generation. KW - BLOCH OSCILLATIONS KW - DYNAMICS KW - LIQUID-CRYSTALS KW - PHOTONIC LATTICES KW - PROPAGATION KW - SOLITONS Y1 - 2015 U6 - https://doi.org/10.1103/PhysRevA.92.043832 VL - 92 IS - 4 PB - American Physical Society ER -