Interface Solitons in Electro-Optically ConfigurableWaveguide Arrays

In this work, we demonstrate a novel electro-optic platform for study of nonlinear light propagation in re-configurable periodic potentials. On the base of this platform, we predict theoretically a novel types of interface solitons existing at the interfaces between chirped and homogeneous lattices. Our platform consists of an array of close coupled waveguides in a x-cut LiNbO₃ crystal, where on both sides of each waveguides we have placed biased electrodes that can control the local refractive index of the waveguide. While in general each waveguide of the array can be independently tuned, in the particular realisation, we have split the array of 100 waveguides in half. In the left half, the waveguides are tuned in the same way, while in the right-hand side of the array, the refractive index is increased linearly with the waveguide number.