Active Anisotropic Coding Metasurface with Independent Real‐Time Reconfigurability for Dual Polarized Waves

Abstract

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.201900930.Metasurfaces, planar arrays composed of subwavelength engineered phase-shifting scatters, have been an emerging platform for advanced and functional control of electromagnetic (EM) waves by manipulating the local properties of amplitude, phase, and polarization of the reflected or transmitted waves. [1][2][3][4][5][6][7][8] The reliability and flexibility of wavefront manipulations by metasurfaces within subwavelength thickness then lead to many new physical effects and versatile applications, including anomalous light refraction, [4,5] invisibility cloak, [9] vortex beams, [10,11] and many other functional metadevices. [12][13][14][15][16][17][18][19] Nowadays, with the rapid development of modern wireless and optical technologies, increasing demands on high communication speed/quality, large data storage capacity are urgently required. The information capabilities of the metasurfaces can be

Transmission‐Reflection Controls and Polarization Controls of Electromagnetic Holograms by a Reconfigurable Anisotropic Digital Coding Metasurface

“…[38] With the rapid development of miniaturized and highly integrated information systems, there is an increasing need to promote multifunctional device design in many applications. Based on the metasurfaces, some multifunctional devices have been reported to manipulate the transmitted EM waves [39] or the reflected EM waves, [40][41][42] in which the polarization-controlled metasurface can have different functions according to the incident polarizations. [41,42] In addition, a few multifunctional full-space metasurfaces, which can control the EM waves in both transmission and reflection simultaneously, also have been developed in recent years.…”

“…Based on the metasurfaces, some multifunctional devices have been reported to manipulate the transmitted EM waves [39] or the reflected EM waves, [40][41][42] in which the polarization-controlled metasurface can have different functions according to the incident polarizations. [41,42] In addition, a few multifunctional full-space metasurfaces, which can control the EM waves in both transmission and reflection simultaneously, also have been developed in recent years. [43][44][45][46][47][48] Besides, the direction-controlled metasurfaces can also be regarded as a kind of full-space metasurface, which have the asymmetric transmission properties.…”

Dynamic Scattering Steering with Graphene‐Based Coding Metamirror

“…Metasurfaces, the 2D equivalence of metamaterials with planar profile, serve as an alternative approach to bypass the volume and fabrication issues, and bridge the gap between the fundamental research and the practical applications. [ 5–8 ] By properly engineering and arranging the individual subwavelength structures, we can fully control their EM properties such as magnitude, [ 9 ] phase, [ 10 ] or polarization, [ 11 ] resulting in an advanced and functional manipulation of the EM propagation direction, polarization, and wavefront pattern. These distinctive features have driven a variety of novel device applications such as holographic imaging [ 12 ] and flat lens.…”

High‐Efficiency Transmissive Programmable Metasurface for Multimode OAM Generation

“…Recently, programmable metasurfaces were proposed to realize real-time manipulations of EM waves through applying dynamic coding sequences. [23,24] Later, new degrees of freedom in EM-wave manipulation have also been proposed in programmable metasurfaces, such as dynamic dual-polarization modulation, [25] dual-band manipulation, [26] space-time-coding modulation, [27] and tunable microwave absorption. [28,29] Digital reflective metasurfaces were deservedly of great significance for the progress in dynamic modulation of the multimode OAM beams.…”