Transmission–Reflection‐Integrated Quadratic Phase Metasurface for Multifunctional Electromagnetic Manipulation in Full Space

Abstract Metasurface has shown significant advantages in full‐space multifunctional electromagnetic (EM) manipulation due to its strong design capability. Here, a novel transmission–reflection‐integrated metasurface is proposed, which can simultaneously manipulate beam direction and polarization states. Through ingenious design based on the quadratic phase distribution, such a metasurface can dynamically control the beam deflection direction in both transmission and reflection modes by shifting the position of the feeding source. In addition, arbitrarily polarized EM waves can be generated based on the dual‐beam coherent interference method. The above EM functions are experimentally demonstrated at microwave frequencies. The wide‐angle beam steering performance is realized in full space, and its scanning range is beyond ±60°. More remarkably, the deflecting beam with different polarization states can be obtained by simultaneously illuminating the metasurface from the reflection and transmission sides with a specific phase difference. The measured results are in excellent accordance with the numerically simulated results, thus verifying the EM manipulation capability of the metasurface. The proposed design provides a new approach to achieve multifunctional beam manipulation in full space, which holds great promise in integrated optics, radar detection, and wireless communication.