Breaking the fundamental scattering limit with gain metasurfaces

Qian, Chao; Yang, Yi; Hua, Yifei; Wang, Chan; Lin, Xiao; Cai, Tong; Ye, Dexin; Li, Er‐Ping; Kaminer, Ido; Chen, Hongsheng

doi:10.1038/s41467-022-32067-9

Cited by 28 publications

(13 citation statements)

References 38 publications

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“…The gain material in Fig. 7a in practice can be implemented, for example, by using negative-resistance components [177][178][179][180] (e.g. microwave tunnel diodes) and optically pumped dye molecules [181,182] (e.g.…”

Section: Discussionmentioning

confidence: 99%

Recent advances of transition radiation: Fundamentals and applications

Chen

Gong

Chen

et al. 2023

Materials Today Electronics

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Section: Discussionmentioning

confidence: 99%

Recent advances of transition radiation: Fundamentals and applications

Chen

Gong

Chen

et al. 2023

Materials Today Electronics

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“…Our work generalizes the prevailing paradigms for metasurface cloak, and the inverse-designed model serves as scattering-savvy assistant to drive intelligent cloak in dynamics. [42,43] 2. Results…”

Section: Introductionmentioning

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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“…When two different bulk media are stacked together, an electromagnetic boundary is formed. The electromagnetic boundary can be exploited to flexibly control the propagation of light, including its phase, amplitude, polarization, and direction. − This way, the electromagnetic boundary is crucial to control light–matter interactions, and its continuing exploration has led to many exotic phenomena and practical applications, including negative refraction, − superlens, , cloak, − and DB boundary. ,, …”

Section: Introductionmentioning

confidence: 99%

“…B H E = • + • (10) where ξ and ζ describe the magnetoelectric coupling. Similarly, the constitutive relations for bianisotropic media 40 can be expressed as…”

Section: ■ Introductionmentioning

confidence: 99%

Perspective on Meta-Boundaries

Zhang

Chen

et al. 2023

ACS Photonics

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The judicious design of the electromagnetic boundary provides a crucial route to control light−matter interactions, and it is thus fundamental to basic science and practical applications. General design approaches rely on the manipulation of bulk properties of the superstrate or substrate and on the modification of boundary geometries. Due to the recent advent of metasurfaces and low-dimensional materials, the boundary can be flexibly featured with a surface conductivity, which can be rather complex but provide an extra degree of freedom to regulate the propagation of light. In this Perspective, we denote the boundary with a nonzero surface conductivity as the meta-boundary. The meta-boundaries are categorized into four types, namely, isotropic, anisotropic, biisotropic, and bianisotropic meta-boundaries, according to the electromagnetic boundary conditions. Accordingly, the latest developments for these four kinds of meta-boundaries are reviewed. Finally, an outlook on the research tendency of meta-boundaries is provided, particularly on the manipulation of light−matter interactions by simultaneously exploiting meta-boundaries and metamaterials.

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Breaking the fundamental scattering limit with gain metasurfaces

Cited by 28 publications

References 38 publications

Recent advances of transition radiation: Fundamentals and applications

Recent advances of transition radiation: Fundamentals and applications

Pushing the Limits of Metasurface Cloak Using Global Inverse Design

Perspective on Meta-Boundaries

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