Nonlinear Dielectric Metasurfaces For Terahertz Generation

Metasurfaces have been demonstrated to be an essential part of the future of thin optics, with applications ranging from cameras to telecoms. Here, we prove that ultrathin aluminium gallium arsenide metasurfaces can nonlinearly generate sizable terahertz signal and demonstrate that the THz emission is strongly affected by the geometry of the dielectric metasurface.