An Intelligent Metasurface for Self‐Adaptive Electromagnetic Manipulation of Transmission/Absorption Frequency and Amplitude

Abstract

AbstractIntelligent metasurfaces have recently attracted much interest due to their strong capability of self‐adaptive electromagnetic (EM) manipulation. However, their realization still faces great challenges, especially in the recognition and modulation of multi‐EM parameters. Here, an intelligent metasurface is proposed that can automatically manipulate its transmission/absorption frequency and amplitude to adapt to the complicated and ambiguous EM environment. By integrating a radio‐frequency sensing module and a closed‐loop feedback system, the incident wave frequency and amplitude information can be recognized and then the corresponding instruction will be generated to make such a metasurface achieve the predefined EM functions. Experimental results have demonstrated that it can realize the dynamic switching between transmission and absorption with the variation of incident power intensity, and meanwhile the transmission/absorption amplitude can be also further adjusted. In addition, this metasurface possesses the frequency‐agile capability, which can self‐adaptively control its transmission/absorption frequency to match the incident frequency. The proposed approach opens a new avenue to promote the development of multifunctional intelligent metasurfaces toward a wide range of real‐time application fields, such as smart EM windows and active camouflage.