  Integrating multiple functionalities into a single metasurface is becoming of
great interest for future intelligent communication systems. While such devices
have been extensively explored for reciprocal functionalities, in this work, we
integrate a wide variety of nonreciprocal applications into a single platform.
The proposed structure is based on spatiotemporally modulated impedance sheets
supported by a grounded dielectric substrate. We show that, by engineering the
excitation of evanescent modes, nonreciprocal interactions with impinging waves
can be configured at will. We demonstrate a plethora of nonreciprocal
components such as wave isolators, phase shifters, and circulators, on the same
metasurface. This platform allows switching between different functionalities
only by modifying the pumping signals (harmonic or non-harmonic), without
changing the main body of the metasurface structure. This solution opens the
door for future real-time reconfigurable and environment-adaptive nonreciprocal
wave controllers.
