Multifunctional full-space metasurface controlled by frequency, polarization and incidence angle

Abstract

Multifunctional metasurfaces have exhibited considerable abilities of manipulating electromagnetic (EM) waves, especially in full-space manipulation. However, most works are implemented with functions controlled by polarization or frequency and seldom involve the incidence angle. Herein, we propose a multifunctional full-space metasurface controlled by frequency, polarization and incidence angle. A meta-atom is firstly designed. When EM waves illumine normally in the C-band, it possesses the characteristic of asymmetric transmission with high-efficient polarization conversion. In the Ku-band, both x- and y-polarized EM waves along both sides will be reflected and achieve broadband and high-efficient cross-polarization conversion. Also, when illumined obliquely, both sides can achieve efficient retroreflection at a certain frequency. As a proof of concept, a metasurface consisting of the above meta-atoms is configured as a dual orbital angular momentum (OAM) vortex beam generator and different beam deflector when illumined normally. Meanwhile, it acts as a multi-channel retroreflector when illumined obliquely. Both the simulated and measured results show excellent performances. Our findings provide a new degree of freedom to design multifunctional metasurfaces that can further promote applications.

Joint Amplitude‐Phase Metasurface for Polarization‐Selective Dynamic Wavefront Manipulation and Broadband Absorption

“…[7][8][9][10] With modern technology developing towards high information processing efficiency and system miniaturization, metasurfaces with multitasking capabilities and high-integration levels are increasingly demanded. [11][12][13][14] For example, to increase the information capability, multifunctional metasurfaces using multiplexing techniques are widely adopted to integrate distinct functionalities dependent on frequency, [15] polarization, [16] or propagation direction. [17] Specifically, as each polarization can be considered as an independent information channel, anisotropic metasurfaces with independent responses for a pair of orthogonally polarized incidence can provide two independent information channels in parallel, which have attracted much attention and may inspire new practical applications.…”

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

“…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].…”

Transmission and reflection mode switching terahertz metasurface for wavefront manipulation

“…Fan et al introduced full-space metasurfaces [4] that operate in transmissive mode at one frequency and in reflective mode at another frequency. Currently, most full-space metasurfaces [4][5][6] achieve mode switching by adjusting the frequency, and active switching within the device itself remains a challenge.…”