Wide‐band polarisation‐independent metasurface‐based carpet cloak

Salami, Pooria; Yousefi, Leila

doi:10.1049/iet-map.2020.0396

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…Dual-wavelength carpet cloak [38] 6.1 and 10.2 GHz -Microwave metasurface cloak [39] 9.5-10.5 GHz À30°-30°M ultifrequency carpet cloaks [40] 7.8-8.2 and 12.3 GHz À10°-10°W ide-band carpet cloak [41] 9- simulate the total reflection of the EM waves. The other dimensions of the bulge sample were all the same as the metasurface to ensure the accuracy of the experimental results.…”

Section: Metasurfacementioning

confidence: 99%

An Additively Manufactured Wide Angle and Broadband Electromagnetic Camouflage Metasurface

et al. 2023

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Metasurface reveals distinguished application prospects profiting from its excellent manipulating capacity for electromagnetic (EM) wave using ultrathin thickness and the simple design method. Easy to conformal metasurface with high performance and integrated EM functions is highly in demand in many EM devices. Herein, an arched dual‐wavelength cloaking–illusion‐integrated metasurface consisting of two‐layer meta‐atoms is proposed successfully. A composite‐fused deposition molding packaging strategy of additive manufacturing is explored to fabricate the multilayer structures for metal meta‐atoms and dielectric substrates simultaneously. Simulation and measurement results show that the arched metasurface possesses polarization‐insensitive cloaking and illusion functions in 4.3–4.8 and 14.8–16.3 GHz, respectively. The effective incidence angle range covers from −45° to 45°. The excellent EM camouflage performance proves the effectiveness of our design and fabricating strategy, which paths a way for multifunctional metasurface‐based devices.

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Section: Metasurfacementioning

confidence: 99%

An Additively Manufactured Wide Angle and Broadband Electromagnetic Camouflage Metasurface

et al. 2023

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“…First, we notice that almost all previous metasurface cloaks have been demonstrated in a convex shape. [ 19,22,30 ] This is not accidental because using complex‐shape to formulate a metasurface cloak will encounter many unpredictable scattering events that can hardly be generalized into concrete guidelines, such as secondary excitation and scattering echo. Second, a metasurface cloak typically works within a narrow incident angle.…”

Section: Introductionmentioning

confidence: 99%

“…First, we notice that almost all previous metasurface cloaks have been demonstrated in a convex shape. [19,22,30] The breakthroughs of transformation optics and metamaterials have kickstarted the study of modern invisibility cloak since the beginning of this century. Many cloaking methodologies have been progressively proposed for specific application scenarios, among which metasurface cloak is largely welcomed owing to its salient features of negligible thickness, easy fabrication, and low loss.…”

mentioning

confidence: 99%

Pushing the Limits of Metasurface Cloak Using Global Inverse Design

Jia

Qian

et al. 2023

Advanced Optical Materials

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formation optics render an object invisible by guiding the flow of light around the hidden object without disturbance to the internal region. [2][3][4][5][6] The underlying physics is attributed to the form invariance of Maxwell's equations: a coordinate transformation can squeeze normal free space from a volume into a shell, only with volumetric constitutive parameters and electromagnetic (EM) fields. Not only in electromagnetics, but transformation optics have also thus far been evolved into a fashionable tool in the realm of sound, heat flow, water waves, and so on. In theory, this method is perfect; however, in an experiment, it is hampered by the bulky material compositions with both anisotropy and inhomogeneity. Substantial efforts have been devoted to mitigating the requirements, such as bilinear transformation optics without singularities and quasi-conformal transformations for ground-plane cloak. [7][8][9][10][11][12][13] Yet, these tradeoffs also impair the cloaking performance to some extend and make the application scenario become more specific.Metasurface cloak is another kind of cloaking methodology that develops contemporaneously. [14][15][16] By adding a layer of deliberately-designed metasurfaces over a hidden region or object, the scattered field can be reconstructed to be similar to that of the pure background, as if there were no region or object. [17][18][19][20][21] Compared with a bulky metamaterial cloak, a metasurface cloak has the distinct advantages of negligible thickness, easy fabrication, and low loss, ushering it popularity in both academia and industry. [22][23][24][25][26] The last several years have seen enormous progress to demonstrate metasurface cloak across different spectra and generalize it from reflection to transmission geometries. [27] Moreover, by incorporating active components and intelligent algorithms, it is promising to transform conventional static cloaking modality to dynamic cloaking that can self-direct to ever-changing external stimuli and environment. [28,29] These advancements are highly demanded for a multitude of practical applications involving moving objects and dynamic environments.Although the current arsenal of design techniques provides enormous capability, metasurface cloak, as well as other cloaking strategies, suffers from some inherent limitations that need to be lifted or pushed, [15] as schematically illustrated in Figure 1a. First, we notice that almost all previous metasurface cloaks have been demonstrated in a convex shape. [19,22,30] The breakthroughs of transformation optics and metamaterials have kickstarted the study of modern invisibility cloak since the beginning of this century. Many cloaking methodologies have been progressively proposed for specific application scenarios, among which metasurface cloak is largely welcomed owing to its salient features of negligible thickness, easy fabrication, and low loss. Similar to other cloaking methodologies, however, metasurface cloak suffers from inherent limits that impair it to a convex shap...

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“…The only disadvantage of this system is that the coating is one-sided. In this method, the user must place the object on a surface and stretch the coating like a carpet to perform an invisibility shell [11]. In contrast, in the proposed method, we imagine the object floats in open space, and the coating covers the entire object like a box.…”

Section: Introductionmentioning

confidence: 99%

Design and construct full invisible band metamaterial-based coating with layer-by-layer structure in the microwave range from 8 to 10 GHz

Talati¹,

Ghazali²,

SoltaniNia³

2023

J. Phys. D: Appl. Phys.

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This paper presents the design and construction of a carpet-based anti-radar coating for frequencies from 8 to 10 GHz. The basic idea of the proposed method is to use a coating to guide microwaves around an object so that what is inside the coating becomes invisible. The proposed method uses metamaterial structures with heterogeneous properties to create coatings that provide complete bounding and prevent loss. Using the theory of light transformation and Zhukovsky mapping for the physical dimensions of the bulge to be invisible, the profile of the refractive index distribution with respect to the radiation of waves is determined. The simulation results of the refractive index profile have shown that it is possible to create an ideal invisible coating for each bulge by using the proposed unit cells and a layer-by layer-structure. Finally, after photolithography of the design on the 5880 fibers using a network analyzer and a pair of corrugated wave antennas, the accuracy of the proposed coating performance is confirmed.

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Wide‐band polarisation‐independent metasurface‐based carpet cloak

Cited by 15 publications

References 41 publications

An Additively Manufactured Wide Angle and Broadband Electromagnetic Camouflage Metasurface

An Additively Manufactured Wide Angle and Broadband Electromagnetic Camouflage Metasurface

Pushing the Limits of Metasurface Cloak Using Global Inverse Design

Design and construct full invisible band metamaterial-based coating with layer-by-layer structure in the microwave range from 8 to 10 GHz

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