@article{SetzpfandtSohlerSchieketal., author = {Setzpfandt, Frank and Sohler, Wolfgang and Schiek, Roland and Pertsch, Thomas}, title = {Nonlinear coupling in discrete optical waveguide arrays with quadratic nonlinearity}, series = {Physical Review A}, volume = {92}, journal = {Physical Review A}, number = {4}, publisher = {American Physical Society}, doi = {10.1103/PhysRevA.92.043832}, abstract = {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.}, language = {en} }