Stereo Meta‐Atom Enabled Phase–Amplitude Gradient Metasurface for Circularly Polarized Waves

Li, Xi Ming; Xi, Xiang; Chen, Jian; Wu, Hua Bing; Li, Xin; Chen, Qiang; Wu, Rui‐Xin

doi:10.1002/adom.202200326

Cited by 14 publications

(5 citation statements)

References 48 publications

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“…Here we mainly focus on the reflection and the refraction can be addressed in a similar way. For our system composed of N c supercells each with M nanorods, as shown in the figure 1(a), the far-field pattern with detection angle θ can be described as [62,63] ( )…”

Section: Theoretical Analysis Based On Huygens' Principlementioning

confidence: 99%

Flat optics of nonuniform phase gradient metasurfaces

Pang,

Song,

Zhang

2024

Phys. Scr.

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Flat optics of uniform phase gradient metasurfaces based on the generalized Snell’s law has been extensively studied. The optics of nonuniform phase gradient metasurfaces (NPGMs) is less clear. Here based on Huygens’ principle and ﬁnite-diﬀerence time-domain (FDTD) simulation, we explore the optical properties of NPGMs made of nanorods (meta-atoms), which can be tuned by modulation of propagation phase and geometric phase. It is found that the nonuniformity of phase gradient may lead to multichannel anomalous reﬂection/refraction. The multiple beam splitters with arbitrary intensity ratio can be achieved by using the amplitude/phase modulation. Based on our design principle, we can obtain diﬀerent anomalous reﬂection patterns (with channels ±1, ±2, both ±1 and ±2, or no reﬂection at anomalous angle) by diﬀerent arrangement of just two types of meta-atoms. In addition, we are able to achieve chiral anomalous reﬂections for designed NPGMs made of nanorods and L-shaped nanoparticles. Our formulism provides general design guidance for NPGMs and can be used to realize the beam splitting function with adjustable angle and intensity ratio.

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Section: Theoretical Analysis Based On Huygens' Principlementioning

confidence: 99%

Flat optics of nonuniform phase gradient metasurfaces

Pang,

Song,

Zhang

2024

Phys. Scr.

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“…M etasurface, a structure consisting of two-dimensional metamaterial units [1], has the benefits of a thin structure, easy fabrication, and flexible electromagnetic wave control [2,3], attracting great interest among researchers and scholars. It is feasible to alter the amplitude, phase, and polarization of electromagnetic waves by discretizing the parameter size of the unit structure [4][5][6]. In 2014, coded metasurfaces were proposed by Cui's group [7], analogizing the structure of units with different phase responses to a binary code.…”

Section: Introductionmentioning

confidence: 99%

Design of a Three-channel Frequency Multiplexing Metasurface in Full Space

Ling,

He,

Hao

et al. 2024

PIER M

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The multifunctional metasurface offers a high degree of flexibility in manipulating electromagnetic waves. However, the majority of its functions are limited to the reflection or transmission space in a single band, restricting the utilization of electromagnetic information. This paper proposes a three-channel multifunctional frequency multiplexing coding metasurface based on the Fabry-Perot cavity principle. It consists of two layers of orthogonal metal gratings and a cross-shaped, oblique open loop structure in the intermediate layer. Simulation results reveal that at an incidence of 22 GHz, the polarization conversion and focusing functions of the transmitted wave are accomplished. Similarly, at an incidence of 31 GHz, the beam deflection function of the reflected wave is observed. Furthermore, at an incidence of 32 GHz, the radar scattering cross-section reduction function of the reflected wave is achieved. In addition to achieving high efficiency, miniaturization, and compactness, the proposed metasurface effectively enhances the spatial utilization of electromagnetic information. As a result, potential applications in multifunctional integrated systems, including wireless communication, sensing technologies, and radar systems, are vast.

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“…Meta-lens, as a transmissive device to focus a light beam by adopting planar metamaterials with gradient refractive index, has demonstrated the great capacities of reshaping the wavefront on the basis of compensating the path length differences from the focus to enhance the antenna gains [13][14][15][16][17][18][19][20]. The F-ratio, describing the relationship between the lens aperture and the focal length with the definition of dividing the focal length by the diameter of the lens, is thus often utilized to qualify the overall profile of the lens system [21,22].…”

Section: Introductionmentioning

confidence: 99%

Highly efficient meta-lens integrated holographic surface antenna

Hao,

Yang,

et al. 2024

J. Phys. D: Appl. Phys.

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We demonstrate the generation of highly directive circularly polarized beams by proposing a meta-lens to calibrate the near fields over the holographic surface. Such a design possesses the merits of ultra-low profile as a lens system on the basis of phase compensation of a specific radiating aperture rather than the conventional consideration of the lens focus, and the ratio between the overall height of the antenna architecture and diameter of radiating aperture is only 0.09. Especially, the proposed meta-lens integrated holographic surface also offers a satisfactory solution to improve the overall efficiency of holographic antennas, and the experimental results verify the proposed design with 27.6 dBic measured gain and 40.4% aperture efficiency at 15 GHz. We expect the proposed strategy of integrating phase compensation lens closely over the holographic surface, pave the way for highly efficient meta-radiators with ultra-low profile.

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Stereo Meta‐Atom Enabled Phase–Amplitude Gradient Metasurface for Circularly Polarized Waves

Abstract: Research data are not shared.

Cited by 14 publications

References 48 publications

Flat optics of nonuniform phase gradient metasurfaces

Flat optics of nonuniform phase gradient metasurfaces

Design of a Three-channel Frequency Multiplexing Metasurface in Full Space

Highly efficient meta-lens integrated holographic surface antenna

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