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.

中文翻译：

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多功能时空超表面的理论与设计

对于未来的智能通信系统，将多种功能集成到单个超颖表面变得越来越引起人们的兴趣。尽管已经针对互惠功能对此类设备进行了广泛的探索，但在这项工作中，我们将各种互惠的应用程序集成到一个平台中。所提出的结构基于由接地的电介质基板支撑的时空调制阻抗片。我们表明，通过工程化e逝模式的激发，可以任意配置与冲击波的不可逆相互作用。我们展示了在同一个超表面上的大量不可逆组件，例如波隔离器，移相器和循环器。该平台仅允许通过修改泵浦信号（谐波或非谐波）来在不同功能之间进行切换，而不改变超表面结构的主体。该解决方案为将来的实时可重构和环境自适应的不可逆波控制器打开了大门。