Switchable Metasurface with Electromagnetically Induced Transparency and Absorption Simultaneously Realizing Circular Polarization‐Insensitive Circular‐to‐Linear Polarization Conversion

Gao, Cheng‐Jing; Zhang, Haifeng

doi:10.1002/andp.202200108

Cited by 12 publications

(6 citation statements)

References 86 publications

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“…Some typical resonance effects are generated by significant coupling based on the responses of various structure components in orthogonal polarization directions [15][16][17][18][19][20]. Electromagnetically induced transparency (EIT) is a slowlight effect, which is of great value in optical storage, optical switching, and nonlinear optics [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Wang,

Fan,

Zhao

et al. 2024

J. Phys. D: Appl. Phys.

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The complex electromagnetic anisotropy of terahertz (THz) metasurfaces with geometric symmetry breaking has attracted extensive attention. Typical effects arise from the coupling of polarization responses in orthogonal directions of various components of the metasurface structure, such as the electromagnetically induced transparency (EIT) effect. However, it is a challenge to precisely control or perfectly avoid the polarization-dependent coupling responses. In this work, deep-subwavelength plasmonic gratings (PGs) with a fine wire width of 1 μm at the order of deep subwavelengths of 1/100 THz wave are fabricated by electron beam lithography, and these wire gratings are graphically designed as a C-shaped metasurface pattern with a period of 100 μm in sub-wavelength scale. The complete anisotropic response in the single-oriented PG metasurface is demonstrated by both simulation and experiments, where the polarization-dependent coupling effect is eliminated. More interestingly, the hybrid-oriented PG metasurface exhibits narrowband and wideband EIT effects in the x and y polarization directions with the maximum polarization extinction ratio of 20 dB, respectively, indicating this mechanism can realize more flexible manipulation of polarization-dependent coupling. This patterned deep-subwavelength PG provides a new structure and mechanism for excitation, regulation, and restriction of polarization-dependent mode coupling, and has important applications in THz spectroscopic detection, polarization imaging, and wireless communication.

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Section: Introductionmentioning

confidence: 99%

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Wang,

Fan,

Zhao

et al. 2024

J. Phys. D: Appl. Phys.

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“…Jitao Li et al introduced graphene into the BIC metasurface and realized the control of quasi-BIC and BIC by adjusting the Fermi level of graphene [51]. Gao et al proposed a bi-functional metasurface with a maximum absorption rate of 90.3% and generated a secondary Fano-like structure [52]. Li et al proposed two dual-function terahertz switchable metasurfaces, exhibiting absorption rates exceeding 90% and producing Fano-like structures [53].…”

Section: Introductionmentioning

confidence: 99%

Conversion and Active Control between BIC and Absorber in Terahertz Metasurface

Xi,

Chen

2024

Photonics

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A multifunctional switchable metamaterial device based on graphene, a gold layer, polyimide, vanadiµm dioxide (VO2), and the sapphire substrate is designed in this paper. The top layer consists of a gold wire, graphene, and two split-ring resonators with the same parameters. By adjusting the Fermi level of graphene, the regulation of BIC and quasi-BIC is realized, and the conversion between BIC and absorber is realized by adjusting the conductivity of VO2. When the device is converted into a wave-absorbing device with single-band absorption characteristics, the Fermi level of graphene at this time is 0.001 eV, the absorption peak at 0.820 THz is higher than 99.5%, and when the Fermi level of regulated graphene is 1 eV, the absorption peak at 0.667 THz is also higher than 99.5%. The peak frequency of the device is 0.640 THz when it converts to quasi-BIC. To the best of our knowledge, this is the first time that the conversion and regulation of BIC and absorber have been achieved using these two phase change materials. Moreover, by adjusting the parameters of the metamaterial structure, the working efficiency and frequency of BIC and absorber can be dynamically adjusted. The electric field distribution and surface current of metamaterials are further studied, and the physical mechanism of effective absorption and BIC is discussed. These results show that the metamaterials proposed in this paper have many advantages, such as terahertz absorption, BIC, and active device control, and are of great significance for developing terahertz multifunctional devices.

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“…VO 2 is a typical reversible phase transition material. [ 21,22 ] The transition temperature of VO 2 from an insulator to a metal phase is 68 °C. [ 23 ] The conductivity of VO 2 ( σ VO2 ) has changed by nearly 3–5 orders of magnitude due to phase transition.…”

Section: Introductionmentioning

confidence: 99%

A Tunable Dual‐Band Flexible Polarization Converter Based on Vanadium Dioxide Reflective Metasurface

Fu,

Zhang,

Zhang

et al. 2023

Physica Status Solidi (a)

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A flexible dual‐band efficient polarization converter is realized by both coupled mode theory (CMT) analysis and numerical simulation in the microwave regime, using a four‐layered reflective metasurface. The proposed structure can convert linearly polarized electromagnetic (EM) waves into their orthogonal components in the two sidebands and a specular reﬂection performance in the central frequency band. The polarization conversion ratio(PCR) and operating bandwidth of dual‐band can be dynamically modulated by the introduction of vanadium dioxide(VO2). Simulation results show that the proposed metasurface can achieve linear polarization conversion in 8.17‐12.87 GHz and 14.63‐18.92 GHz in the insulating phase. PCRs of the dual‐band are 97.06% and 98.13%, the corresponding relative bandwidths (RB) are 44.68% and 25.58%, respectively. In the metallic phase, the PCRs in 6.81‐13.95 GHz and 16.23‐18.16 GHz are 91.12% (RB=68.79%) and 96.92% (RB=11.22%). The analyses of the phase difference (u‐v coordinate system) and the surface current are given to explain the mechanisms of dual‐band and high PCR. The simulation results are in good agreement with those of CMT. Moreover, the structure has a robust response to the oblique incidence angle (up to 30°) and has polarization insensitivity. The proposed metasurface has great potential applications in antenna radiation, biosensing and stealth technology.This article is protected by copyright. All rights reserved.

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Switchable Metasurface with Electromagnetically Induced Transparency and Absorption Simultaneously Realizing Circular Polarization‐Insensitive Circular‐to‐Linear Polarization Conversion

Cited by 12 publications

References 86 publications

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Conversion and Active Control between BIC and Absorber in Terahertz Metasurface

A Tunable Dual‐Band Flexible Polarization Converter Based on Vanadium Dioxide Reflective Metasurface

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