Dispersion-Assisted Dual-Phase Hybrid Meta-Mirror for Dual-Band Independent Amplitude and Phase Controls

Independent Manipulation of Aperture and Radiation Fields in a Transmission‐Reflection Integrated Complex‐Amplitude Metasurface

“…[ 25–33 ] For example, utilizing frequency‐multiplexing, multiple waves carrying different wavefront information can be encoded onto a single metasurface composed of multiple resonators with different geometries, which behaves individually to different operation frequencies of exciting waves. [ 25–28 ] In another scheme, researchers have designed orthogonal, linear, or circular polarization multiplexing metasurfaces by combining polarization‐selective properties of anisotropic meta‐atoms with the propagation phase or/and geometric phase. [ 29–33 ] In addition, other DoFs such as incident angles, [ 34,35 ] nonlinearity, [ 36 ] and orbital angular momentum [ 37,38 ] have also been exploited in channel multiplexing.…”

“…Typically, polarization and frequency states of incident/receiving waves would be too convenient and feasible for switching different channels in metasurfaces. [25][26][27][28][29][30][31][32][33] For example, utilizing frequency-multiplexing, multiple waves carrying different wavefront information can be encoded onto a single metasurface composed of multiple resonators with different geometries, which behaves individually to different operation frequencies of exciting waves. [25][26][27][28] In another scheme, researchers have designed orthogonal, linear, or circular Metasurfaces have superior performance in flexible wave manipulation used for various multifunctional devices.…”

Lightweight Machine-Learning Model for Efficient Design of Graphene-Based Microwave Metasurfaces for Versatile Absorption Performance

“…Metasurfaces, composed of periodic or quasi-periodic two-dimensional (2D) arrays of subwavelength units, have emerged as one of the most thriving types of artificial electromagnetic surfaces, owing to their fascinating and tailorable electromagnetic properties [ 1 , 2 ]. In contrast to traditional bulk metamaterials [ 3 , 4 , 5 , 6 ], metasurfaces exhibit extreme thicknesses which enable engineering electromagnetic waves in phase, amplitude, and polarization through a compact and easiley fabricated system, providing great freedom in manipulating light-matter interactions at the sub-wavelength scale [ 7 , 8 ]. Such promising approaches prove their feasibility in numerous applications, from basic devices of holograms [ 9 ], electromagnetic absorbers [ 10 ], and polarizers [ 11 ], to more complex systems of information encryption [ 12 , 13 ], signal processing [ 14 ], and intelligent recognization [ 15 ].…”

High-Efficiency Geometric Phase Metasurface with Multifold Rotationally Symmetric Resonators

“…This approach is more promising than other types of phase control methods in metasurfaces where dispersion engineering is required. By realizing the electric response, one can reach the maximum theoretically predicted efficiency of geometric phase metasurfaces of 25%. , This efficiency can be enhanced via the combination of magnetic and electric responses in a single metasurface. − Different from the propagation phase, geometric phases contain meta-atom arrays in the form of rotated patterns − and enable the design of phase-varying applications such as meta-holograms, , vortex beams, , and flat lenses. − It is worth noting that common geometric phase metasurfaces can only give phase shifts twice the rotation angle because of the 2-fold symmetric anisotropic structures on which they are based. Recently, a multifold geometric phase metasurface capable of providing phase shifts that are multiple times the rotation angle due to the independent rotation of the principal axis and meta-atoms was proposed .…”

“…18,19 This efficiency can be enhanced via the combination of magnetic and electric responses in a single metasurface. 20−22 Different from the propagation phase, geometric phases contain meta-atom arrays in the form of rotated patterns 23−28 and enable the design of phase-varying applications such as meta-holograms, 29,30 vortex beams, 20,31 and flat lenses. 32−34 It is worth noting that common geometric phase metasurfaces can only give phase shifts twice the rotation angle because of the 2-fold symmetric anisotropic structures on which they are based.…”