Spatial-spectral vortex solitons in quadratic lattices.
We predict the existence of spatial-spectral vortex solitons in one-dimensional periodic waveguide arrays with quadratic nonlinear response. In such vortices the energy flow forms a closed loop through the simultaneous effects of phase gradients at the fundamental frequency and second-harmonic fields and the parametric frequency conversion between the spectral components. The linear stability analysis shows that such modes are stable in a broad parameter region.
Centre for Ultra-High Bandwidth Devices for Optical Systems (CUDOS), Nonlinear Physics Centre, Research School, of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia. xzy124@physics.anu.edu.au
Zhiyong
Z
Xu
Andrey A
AA
Sukhorukov