Metasurfaces provide an almost unlimited toolbox to design the wavefront of light in search of new phenomena and applications.   Using Matrix Fourier optics we have designed the spatial distribution of Jones matrices to achieve polarization sensitive imaging, a new type of holography with control of polarization in the far-field and Mueller matrix imaging.  Polarization metaoptics has led to an error-free biometric authentication system for smartphones. I will also present recent developments in large area metalenses for astrophysics as well as high efficiency broadband metalenses. I will conclude with our recent work on bilayer free-standing metasurfaces and the new functionalities that they enable.