Linear and nonlinear optical properties of chiral metasurfaces.
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Optical activity, $i.e.$ the ability to rotate the polarization state of light, can also occur in structures that are not chiral at all, a property of fundamental importance for many applications. This effect can be artificially obtained by means of metasurfaces, $i.e$ materials surfaces with suitable nanostructures under appropriate light injection. Also a nonlinear optical response can be obtained, such as second order circular dichroism, thanks to the recent successes in nanotechnology, opening the way to new functionalities on a spatial scale of few hundreds on nanometers. In what follows we describe some properties of chiral metasurfaces.