Gradient Nonlinear Pancharatnam-Berry Metasurfaces
Gradient Nonlinear Pancharatnam-Berry Metasurfaces
We apply the Pancharatnam-Berry phase approach to plasmonic metasurfaces loaded by highly nonlinear multiquantum-well substrates, establishing a platform to control the nonlinear wave front at will based on giant localized nonlinear effects. We apply this approach to design flat nonlinear metasurfaces for efficient second-harmonic radiation, including beam steering, focusing, and …