Pancharatnam–Berry metasurface for terahertz wave radar cross section reduction*

Li, Shaohe; Li, Jiusheng

doi:10.1088/1674-1056/ab33f5

Cited by 18 publications

(8 citation statements)

References 21 publications

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“…Anisotropic metasurfaces are usually utilized to manipulate the polarization state of EM wave. Besides the polarization manipulation, the phase profile can also be controlled by anisotropic metasurface to achieve some novel applications such as holography, [21] meta-lens, [64] RCS reduction, [76] and vortex beam. [77] Here, an anisotropic coding metasurface is designed to achieve both polarization conversion and the phase control of a normally incident plane wave.…”

Section: Oam Beam Generatormentioning

confidence: 99%

Transmissive 2-bit anisotropic coding metasurface

Lai¹,

Li²,

Wang³

et al. 2022

Chinese Phys. B

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Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic wave. However, archiving transmissive coding metasurface is still challenging. Here we propose a transmissive anisotropic coding metasurface that enables the independent control of two orthogonal polarizations. The polarization beam splitter and the OAM generator have been studied as typical applications of anisotropic 2-bit coding metasurface. The simulated far field patterns illustrate that the x and y polarized electromagnetic waves are deflected into two different directions, respectively. The anisotropic coding metasurface has been experimentally verified to realize an orbital angular momentum (OAM) beam with l = 2 of right-handed polarized wave, resulting from both contributions from linear-to-circular polarization conversion and the phase profile modulation. This work is beneficial to enrich the polarization manipulation field and develop transmissive coding metasurfaces.

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Section: Oam Beam Generatormentioning

confidence: 99%

Transmissive 2-bit anisotropic coding metasurface

Lai¹,

Li²,

Wang³

et al. 2022

Chinese Phys. B

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“…PB metasurfaces are commonly used in THz wave manipulation by introducing extra geometric phases through unit orientation rotation to generate THz CP waves. Many PB metasurfaces have been designed for various THz wavefront manipulation functions [16][17][18][19]. Zhang et al have designed a tunable THz PB metasurface with graphene that can generate OAM beams by adjusting the graphene's chemical level [20].…”

Section: Introductionmentioning

confidence: 99%

Broadband multifunctional metasurface based on voltage-tunable VO2

Hu,

2023

5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023)

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THz metasurfaces that reflect radiation back can be applied in various fields such as imaging, biosensing, and optical communications. However, the conventional THz metasurfaces have limitations due to their inflexible electromagnetic responses and complex structures. In this paper, a voltage-controlled dual-polarization metasurface based on vanadium dioxide (VO2) is proposed, which can achieve the polarization conversion and transmission by controlling the conductivity of VO2 in the surface. The results show that when the VO2 is in the metal state, the metasurface can realize the circular polarization mode conversion in the range of 1.2-1.4 THz. While insulated, it will switch to the low-efficiency transmission conversion mode. Then, A broadband voltage-controlled OAM beam generator metasurface is designed, providing a method for realizing high performance multifunctional tunable metasurfaces in the THz band. This work has the potential to expand the practical applications of metasurfaces.

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“…[7][8][9][10][11][12][13][14][15][16][17] The arrival of metasurfaces has made up for the shortage of electromagnetic materials in the terahertz band, has provided an effec-tive way to realize functional devices in the terahertz band, and is expected, in essence, to break through the bottleneck of terahertz technology development. To date, many remarkable achievements based on metasurfaces have been accomplished and demonstrated in the microwave band, including high-gain antennas, [18] polarization conversion, [19][20][21] beam focusing, [22,23] radar cross-section reduction, [24][25][26] vortexbeam generation, [27][28][29][30] and so on. In comparison with the microwave band, terahertz waves are a new research topic, and related technologies are still in the early stages of exploration.…”

Section: Introductionmentioning

confidence: 99%

Efficient Manipulation of Terahertz waves by multi-bit Coding Metasurfaces and its further application

Qi¹,

Zhang²,

Ding³

et al. 2020

Chinese Phys. B

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Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band, in this paper, we use the Pancharatnam-Berry (PB) phase concept to propose a high-efficiency reflectivetype coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel functionalities. By optimizing the coding sequences, we demonstrate that the designed 1-, 2-, and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz waves. The two proposed 1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily controlled. For normally incident x-and y-polarized waves, a 10 dB radar cross-section (RCS) reduction can be achieved from 2.1 THz to 5.2 THz using the designed 2-bit coding metasurface. Moreover, two kinds of orbital angular momentum (OAM) vortex beams with different moduli are generated by a coding metasurface using different coding sequences. Our research provides a new degree of freedom for the sophisticated manipulation of terahertz waves, and contributes to the development of metasurfaces towards practical applications.

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Pancharatnam–Berry metasurface for terahertz wave radar cross section reduction*

Cited by 18 publications

References 21 publications

Transmissive 2-bit anisotropic coding metasurface

Transmissive 2-bit anisotropic coding metasurface

Broadband multifunctional metasurface based on voltage-tunable VO2

Efficient Manipulation of Terahertz waves by multi-bit Coding Metasurfaces and its further application

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