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.

Broadband circular polarization conversion metasurface with half-transmission and half-reflection simultaneously for full-space wavefront manipulation application

“…Figures 1(a,b) present the front and perspective views of the unit-cell structure of the proposed single layer MS. Similarly to the previous design of the MSs [34,[38][39][40], the S-shaped structure can behave as a dipole resonator and couples an electric component of the incident EM wave and generate a partial polarization conversion in a broadband range. In addition, as shown in Fig.…”

“…To improve the utilization e ciency of space resources, full-space MSs for both transmission and re ection are highly desirable [30][31][32][33]. As a result, the raised attention and great efforts have been devoted to manipulate the re ected and transmitted EM waves simultaneously or independently [34][35][36][37][38][39][40][41]. For instance, Cai et al, proposed a new type of MS with polarization-dependent re ection and transmission properties, which can manipulate full-space EM waves [32].…”

Integrated optical beam steering device using switchable nanoantennas and a reflective metalens

“…However, since each unit cell used in construction of metasurfaces should be tuned individually, it increases the complexity and cost of these structures 33 – 38 . To overcome this problem, lens-based structures have been introduced to work in microwave 57 – 59 and optical 49 – 55 regime.…”

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

“…By employing a tunable meta-atom driven by thermal, [9,10] optical, [11,12] electrical, [13][14][15] or mechanical methods, [16,17] the reconfigurable metasurface can change the propagation amplitude, phase, or polarization of EM waves in real time, performing the outstanding capability of dynamic wave manipulation. [18][19][20] In the microwave region, active components such as varactor diodes and PIN switches are generally adopted into meta-atom, [21][22][23][24][25] which have constructed a variety of fascinating metadevices, including beam steering antenna, [22] switchable polarizer, [24] and reconfigurable cloak. [25] In addition, some advanced materials, including liquid crystal and graphene, can also provide tunable or switchable functionalities when incorporated into metasurfaces.…”