A hybrid invisibility cloak based on integration of transparent metasurfaces and zero-index materials

Chu, Hongchen; Li, Qi; Liu, Bingbing; Luo, Jie; Sun, Shulin; Hang, Zhi Hong; Zhou, Lei; Lai, Yun

doi:10.1038/s41377-018-0052-7

Cited by 186 publications

(110 citation statements)

References 56 publications

(46 reference statements)

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“…In this paper, the management for multibands EMWs range from microwave to UV by bionic moth‐eye structure was studied for the first time. The microwave absorption mechanism of bionic structure was analyzed by topological theory that found a new model of absorption mechanism, the pioneering technique of MM design with multibands EMWs manipulation presented here enables a new paradigm on the photonic devices, and has broad application prospects in military stealth technology, sensing, photovoltaics, photodetectors, UV‐shielding, photonic topological insulators, and invisibility cloak fields, etc.…”

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confidence: 99%

Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics

Huang

Duan

Dai

et al. 2019

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the light-responsive properties also have excellent adaptability to the environment. [7] Under the inspiration of these controllable optical properties, a variety of advanced material systems have been proposed significantly. [7,8] However, researchers were simply concentrated in a specific waveband due to the great difficulty to achieve the compatibility of multispectral properties, which greatly hinders advance science and the application fields expanding of novel photonic materials. For example, in order to avoid the detection of microwave radar, infrared detector, and visual observation, the stealth materials on military armament have been separately developed during microwave, infrared, and visible light range; [9][10][11] but the above stealth properties were difficult to be compatible in one weapon, thus, the problem of perfect stealth (stealth during full wavebands) is still not solved to date. Moreover, the material degradation by ultraviolet (UV) radiation also needs to be settled urgently because the weapons are exposed to sunlight all year round. Although metamaterials (MMs) researchers have conducted multibands studies, [12] such as optically transparent microwave absorbing materials, [13] multispectral absorption MMs, [14] and multibands resonators, [15] etc., only two or three bands were involved, and the multibands compatibility has not been deeply explored. When devices worked in real environments, dust particles accumulated on its surface over time, which would have an adverse effect on its light manipulation performance. In order to avoid this problem, it is desirable to integrate a self-cleaning ability induced by hydrophobic property of material into the equipment. [16] In this context, a hierarchical structure model of moth compound eye that might manipulate multibands EMWs was found here, as shown in Figure 1a. [17,18] This is a noctuid moth living in Heilongjiang Province of China; the hierarchical and sub-wavelength structures that are arranged in a highly ordered array of its eye surface could suppress the reflection of light to avoid detection by nocturnal predators and to see clearly in darkness, which is based on rigorous coupled wave analysis (RCWA) and finite difference time domain (FDTD) methods, [19] as well as relative research on moth eye model. [18,20] This feature makes the moth-eye model one of the most effective antireflective structures in nature. Although various photonic devices inspired by natural materials have been developed, there is no research focusing on multibands adaptability, whichis not conducive to the advancement of materials science. Herein, inspired by the moth eye surface model, state-of-the-art hierarchical metamaterials (MMs) used as tunable devices in multispectral electromagnetic-waves (EMWs) frequency range, from microwave to ultraviolet (UV), are designed and prepared. Experimentally, the robust broad bandwidth of microwave absorption greater than 90% (reflection loss (RL) < −10 dB) covering almost entire X and Ku bands (8.04-17.88 GHz) under a de...

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confidence: 99%

Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics

Huang

Duan

Dai

et al. 2019

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“…We begin by briefly revisiting the scattering in environments with low or near-zero index. In experiments, the transparent or low-loss environments with low or near-zero index can be effectively constructed, for example, by waveguides [36,37,43], doped epsilon-near-zero materials [44,45], photonic crystals with Dirac cones [35], and metamaterials [46][47][48][49]. For conceptual clarity, we consider the superscattering from a 2D subwavelength rod in the transparent environment [inset in Figure 1].…”

Section: Resultsmentioning

confidence: 99%

Superscattering of Light in Refractive-Index Near-Zero Environments

Chan¹,

Qian²,

Hu³

et al. 2020

PIER

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Enhancing the scattering of light from subwavelength structures is of both fundamental and practical significance. While the scattering cross section from each channel cannot exceed the single-channel limit, it is recently reported that the total cross section can far exceed this limit if one overlaps the contribution from many channels. Such a phenomenon about enhancing the scattering from subwavelength structures in free space is denoted as the superscattering in some literature. However, the scatterer in practical scenarios is not always in free space but may be embedded in environments with non-unity refractive index n. The influence of environments on the superscattering remains elusive. Here the superscattering from subwavelength structures in the isotropic environment with near-zero index are theoretically investigated. Importantly, a smaller n can lead to a larger total cross section for superscattering. The underlying mechanism is that a smaller n can give rise to a larger singlechannel limit. Our work thus indicates that the scattering from subwavelength structures can be further enhanced if one simultaneously maximizes the single-channel limit and the contribution from many channels.

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“…However, making a transmissive metasurface cloak is very challenging, as the cloak should not only prevent reflection but also redirect the incident wave to pass around the hidden object without touching it. Recently, Chu et al proposed a new device configuration that integrates a transparent gradient metasurface with an ultrathin zero-index material (ZIM) as a cloak working in transmission geometry [298]. The cloaking effect is realized through the following three steps, enabled by the metasurfaces and the ZIM [ Fig.…”

Section: Metasurface-based Cloakingmentioning

confidence: 99%

Electromagnetic metasurfaces: physics and applications

et al. 2019

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H-shaped resonators (inset) are adopted to realize, respectively, the desired B layer with negative ε and A layers with positive ε at the working frequencies [25]. (d) Top and middle panels: interference model and practical design of the metamaterial antireflection coating. Middle panel: experimentally measured reflectance and transmittance spectra for the normal incidence case. The solid and dashed lines represent the reflectance and transmittance of a bare GaAs surface [26]. (a) Figure 1 reprinted with permission from Martín-Moreno et al.,

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A hybrid invisibility cloak based on integration of transparent metasurfaces and zero-index materials

Cited by 186 publications

References 56 publications

Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics

Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics

Superscattering of Light in Refractive-Index Near-Zero Environments

Electromagnetic metasurfaces: physics and applications

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