Geometric Phase and Nonlinear Photonic Metasurfaces

Compared to the conventional optical elements, two dimensional photonic metasurfaces, consisting of arrays of antennas with subwavelength thickness, enable the manipulation of light-matter interaction on a more compact platform. Using metasurfaces, the polarization, phase and amplitude of light can be controlled by spatially variant meta-atoms at the subwavelength scale. Many exotic phenomena in linear optics such as imaging with ultrathin flat lenses, optical spin Hall Effect, highly efficient holography etc., have been successfully demonstrated. However, growing demand for integrating more functionalities into an optoelectronic circuit also relies on the availability of tailored nonlinear optical properties of metasurfaces. In this talk, I will share the latest progress in nonlinear photonic metasurfaces. The concept of nonlinear geometric phase and its application in nonlinear wavefront engineering will be discussed.