Multifunctional Janus metasurfaces achieving arbitrary wavefront manipulation at dual frequency

Tang, Ziyi; Li, Ling; Zhang, Haochen; Yang, Jianing; Hu, Jie; Lu, Xuehua; Hu, Ying; Qin, Song; Liu, Ke; Tian, Mingyang; Jin, Jinjin; Zhang, Zuojun; He, Lin; Huang, Yijia

doi:10.1016/j.matdes.2022.111264

Cited by 20 publications

(3 citation statements)

References 53 publications

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“…Metamaterials are artificially constructed electromagnetic structures that possess properties not found in natural materials. The metasurfaces are the two-dimensional structure of metamaterials with special functions and properties, which are composed of planar periodic units arranged in certain specific orders to achieve ondemand electromagnetic responses, such as the electromagnetically induced transparency (EIT) [1,2], perfectly absorbing [3][4][5], hologram [6][7][8] and polarization conversion [9]. Perfectly absorbing metasurface is usually achieved using a three-layer structure [10].…”

Section: Introductionmentioning

confidence: 99%

Optimized design for absorption metasurface based on autoencoder (AE) and BiLSTM-Attention-FCN-Net

Zhu,

Du,

Dong

et al. 2024

Phys. Scr.

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In order to speed up the process of optimizing design of metasurface absorbers, an improved design model for metasurface absorbers based on autoencoder (AE) and BiLSTM-Attention-FCN-Net (including bidirectional long-short-term memory network, attention mechanism, and fully-connection layer network) is proposed. The metasurface structural parameters can be input into the forward prediction network to predict the corresponding absorption spectra. Meantime, the metasurface structural parameters can be obtained by inputting the absorption spectra into the inverse prediction network. Specially, in the inverse prediction network, the bidirectional long-short-term memory (BiLSTM) network can effectively capture the context relationship between absorption spectral sequence data, and the attention mechanism can enhance the BiLSTM output sequence features, which highlight the critical feature information. After the training, the mean square error (MSE) value on the validation set of the reverse prediction network converges to 0.0046, R2 reaches 0.975, and our network can accurately predict the metasurface structure parameters within 1.5s with a maximum error of 0.03mm. Moreover, this model can achieve the optimal design of multi-band metasurface absorbers, including the single-band, dual-band, and three-band absorptions. The proposed method can also be extended to other types of metasurface optimization design.

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Section: Introductionmentioning

confidence: 99%

Optimized design for absorption metasurface based on autoencoder (AE) and BiLSTM-Attention-FCN-Net

Zhu,

Du,

Dong

et al. 2024

Phys. Scr.

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“…In this context, attributed to the merits of simplicity, easy fabrication, and low loss, metasurfaces as the 2D embodiment of metamaterials arranged through well-designed periodic or quasi-periodic subwavelength building blocks, emerge as a desirable and powerful platform for tailoring EM waves based on customizable multiple degrees of freedoms (DOFs) and adjustable geometric parameters. [12][13][14][15][16][17][18] Especially, with their capabilities of steering the scatter behavior of ultrathin planar pixels precisely, metasurfaces shape a heuristic framework for image display, which can be employed to record and represent the holographic patterns with high resolution and high fidelity. [19,20] In addition, the advent of widely-known computergenerated holography (CGH), [21,22] which exploits numerical calculations to generate wavefront profiles at coherent interfaces, undoubtedly injects propellant into the reconstruction of spatial images for metasurfaces, empowering them to surmount the limitations of traditional holography and yield countlessly innovative effects.…”

Section: Introductionmentioning

confidence: 99%

Generic Vectorial Hologram Based on Simultaneous and Independent Amplitude and Phase Modulation of Orthogonal Polarization States via Single Completely Spin‐Decoupled Meta‐Particles

Chu,

Liu,

et al. 2023

Laser & Photonics Reviews

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Metasurfaces composed of subwavelength structure arrays provide a diverse and powerful platform for generation of complicated electromagnetic (EM) fields and wavefronts manipulation and have triggered an unprecedented research upsurge in electromagnetism with the development of computer‐generated holography (CGH). Different from conventional scalar holograms only containing amplitude and phase properties, a vectorial hologram that benefits from the maneuverability of polarization of EM fields exhibits more immeasurable application potential and is simultaneously regarded as an urgent requirement. In this work, assisted by single completely spin‐decoupled meta‐particles, which perfectly combine the functions of simultaneous and independent amplitude and phase modulation of orthogonal polarization states containing left‐ and right‐handed circularly polarized (LCP&RCP) components, a vectorial hologram induced through eigenstates degeneracy with the ability of encoding arbitrary polarization is proposed in the microwave region. As the proof of concept, eight distinct holograms with specified polarizations and six‐channel polarization‐multiplexed hologram display are fabricated and characterized, further showcaing the versatility of the approach for the customization of arbitraty polarization and integration of reconstructed patterns. With the advantages of multi‐controllability and ultra‐compactness, the constructed monolayer completely spin‐decoupled paradigm for vectorial regulation may find prospective application aspects in spin detection, target perception, multi‐channel data encryption, and many other related fields.

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“…Regardless of the underlying mechanism of each application, all different applications are achieved on the basis of manipulating fundamental properties of EM phenomena during their propagation [4]. Recently, artificially structured metasurfaces have shown flexible manipulation of amplitude, phase, and polarization of EM waves [5][6][7][8][9][10][11][12]. Metasurfaces' exceptional properties and abilities have made breakthroughs in many different fields, including stealth technology [13][14][15][16][17], quantum photonics [18], optical devices [19,20], and even polarization transformation devices [21,22].…”

Section: Introductionmentioning

confidence: 99%

All-Metal Coding Metasurfaces for Broadband Terahertz RCS Reduction and Infrared Invisibility

Zhang,

Dong

et al. 2023

Photonics

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With the rapid advancement of modern technology and radar detection systems, electromagnetic (EM) stealth technology has become increasingly significant, particularly in aircraft stealth and military radar applications. In this work, an all-metal metasurface is designed for broadband terahertz radar cross-section (RCS) reduction and infrared invisibility. The all-metal metasurface possesses extremely low infrared emissivity and high polarization conversion in the terahertz band. Through the joint simulation of MATLAB and CST, a genetic algorithm is used to optimize the random phase distribution of 2, 3, and 4-bit metasurfaces, so that the reflected wave is scattered to achieve broadband terahertz RCS reduction. Simulation results show that the metasurface can simultaneously achieve broadband terahertz RCS reduction in 3–5 THz and infrared invisibility in 24–38 THz (8–12.5 μm). The RCS reduction of the coding metasurface is greater than 10 dB compared to the metal plate, and the maximum RCS reduction of the 4-bit metasurface can reach 21.1 dB. Compared to the traditional design method, the proposed method can reduce time consumption and find the optimal result to achieve high performance. We believe the proposed method can provide significant guidance for surface coating in camouflage applications and opens up new possibilities for improving the information capacity of coding metasurfaces.

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Multifunctional Janus metasurfaces achieving arbitrary wavefront manipulation at dual frequency

Cited by 20 publications

References 53 publications

Optimized design for absorption metasurface based on autoencoder (AE) and BiLSTM-Attention-FCN-Net

Optimized design for absorption metasurface based on autoencoder (AE) and BiLSTM-Attention-FCN-Net

Generic Vectorial Hologram Based on Simultaneous and Independent Amplitude and Phase Modulation of Orthogonal Polarization States via Single Completely Spin‐Decoupled Meta‐Particles

All-Metal Coding Metasurfaces for Broadband Terahertz RCS Reduction and Infrared Invisibility

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