Metasurface Holography in the Microwave Regime

Abstract

Hologram technology has attracted a great deal of interest in a wide range of optical fields owing to its potential use in future optical applications, such as holographic imaging and optical data storage. Although there have been considerable efforts to develop holographic technologies using conventional optics, critical issues still hinder their future development. A metasurface, as an emerging multifunctional device, can manipulate the phase, magnitude, polarization and resonance properties of electromagnetic fields within a sub-wavelength scale, opening up an alternative for a compact holographic structure and high imaging quality. In this review paper, we first introduce the development history of holographic imaging and metasurfaces, and demonstrate some applications of metasurface holography in the field of optics. We then summarize the latest developments in holographic imaging in the microwave regime. These functionalities include phase- and amplitude-based design, polarization multiplexing, wavelength multiplexing, spatial asymmetric propagation, and a reconfigurable mechanism. Finally, we conclude briefly on this rapidly developing research field and present some outlooks for the near future.

Metasurfaces for Far-Field Radiation Pattern Correction of Antennas under Dielectric Seamed-Radomes

“…Metasurfaces (MSs) are electrically thin periodic composite structures, which can be fully dielectric or metal-dielectric, and can be modeled as zero-thickness engineerable sheets to control the behavior of impinging electromagnetic radiations at will [5][6][7][8]. The metasurface's unit-cell, also referred to as meta-atom, can be carefully designed to obtain specific amplitude and phase profiles, thus enabling a plethora of applications, ranging from polarization converters [9,10] to absorbers [11][12][13][14][15], as well as wide-angle impedance matching structures [16,17], imaging holography [18][19][20], complex waves generation [21] and many more [22]. More recently, programmable metasurfaces have attracted huge interests due to their versatility in performing different functionalities [23].…”

Electronic Beam-Scanning Antenna Based on a Reconfigurable Phase-Modulated Metasurface

“…Thanks to these structures, new properties, such as anomalous reflection and refraction, have been proposed and demonstrated [7][8][9]. Metasurfaces also facilitated the generation of complex wavefronts, such as Airy beams [10,11], vortex beams carrying orbital angular momentum (OAM) [12,13], Bessel beams [14][15][16] and image holograms [17][18][19][20][21]. In the field of antennas, metasurfaces have aided in developing different topologies of structures.…”

Active Meta-Device for Dual-Transmission Windows with Tunable Angular Dispersion Characteristics

“…Nowadays, active metasurfaces [ 11 , 12 ] have provided a dynamic and flexible approach to achieve electromagnetic regulation. Active components [ 13 , 14 ] or phase-change materials [ 15 , 16 ] have been introduced to achieve reconfigurable properties. They are more flexible and diverse in efficiently regulating the amplitude, phase, and polarization of EM waves [ 17 , 18 ].…”