Non-reciprocal wave manipulation with non-linear metasurfaces

Abstract

We introduce non-reciprocal metasurfaces based on non-linear effects, allowing signal transmission from one direction to another, but not the other way around. We also present a particular design at THz frequencies, suitable for breaking reciprocity of wave reflection. Compared to other approaches for breaking reciprocity, non-linear metasurfaces have the significant advantage of not relying on any form of external bias and they can be used for the protection of sources or other sensitive equipment from strong external signals.