Water-injected all-dielectric ultra-wideband and prominent oblique incidence metamaterial absorber in microwave regime

Huang, Xiaojun; Yang, Helin; Shen, Zhaoyang; Jiao, Chen; Lin, Hail; Yu, Zetai

doi:10.1088/1361-6463/aa81af

Cited by 70 publications

(29 citation statements)

References 41 publications

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“…6c ). To obtain high microwave absorption performance, the material needs to not only meet impedance match, but also a large attenuation constant (α) is required to satisfy the large energy loss 50 . The attenuation constant α (details in Supplementary Section 2 ) determines the attenuation capability of the input electromagnetic waves 51 .…”

Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

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Aerogel fibers have been recognized as the rising star in the fields of thermal insulation and wearable textiles. Yet, the lack of functionalization in aerogel fibers limits their applications. Herein, we report hygroscopic holey graphene aerogel fibers (LiCl@HGAFs) with integrated functionalities of highly efficient moisture capture, heat allocation, and microwave absorption. LiCl@HGAFs realize the water sorption capacity over 4.15 g g−1, due to the high surface area and high water uptake kinetics. Moreover, the sorbent can be regenerated through both photo-thermal and electro-thermal approaches. Along with the water sorption and desorption, LiCl@HGAFs experience an efficient heat transfer process, with a heat storage capacity of 6.93 kJ g−1. The coefficient of performance in the heating and cooling mode can reach 1.72 and 0.70, respectively. Notably, with the entrapped water, LiCl@HGAFs exhibit broad microwave absorption with a bandwidth of 9.69 GHz, good impedance matching, and a high attenuation constant of 585. In light of these findings, the multifunctional LiCl@HGAFs open an avenue for applications in water harvest, heat allocation, and microwave absorption. This strategy also suggests the possibility to functionalize aerogel fibers towards even broader applications.

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Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

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“…[57] An all-dielectric metamaterial based on water can realize ultra-wideband absorption. [58] In one study, a ultraviolet-light photosensitive resin (UV-PR) substrate with cross water-flow channels was fabricated using a 3D printer. The UV-PR was used to surround four sides of a sample, to encapsulate the sample.…”

Section: Cavity Injection Methodsmentioning

confidence: 99%

All‐Dielectric Metamaterial Fabrication Techniques

Wang

et al. 2020

Advanced Optical Materials

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region. Basically, all-dielectric metamaterials are composed of polymers, dielectrics, ferrites, or composite materials. [20-22] The unusual electromagnetic properties of all-dielectric metamaterials not only derive from their artificial structure, but also originate directly from the materials, revealing an approach to designing metamaterials with more freedom. [23] Since the initial proposal of all-dielectric metamaterials, various realization mechanisms have been studied and reported. [24-26] The most classical mechanism is based on the so-called Mie-resonance theory, and has been studied extensively. [27-29] In this strategy, dielectric particles with relatively high permittivity are used to generate strong magnetic or electric resonance through electromagnetic wave interaction. Therefore, a negative permeability or permittivity can be produced by the oscillation of the resulting magnetic or electric dipole. This mechanism is simple and versatile, and is generally adopted for the realization of all-dielectric metamaterials with low losses. [30] Ferromagnetic resonance (FMR) theory is another classical realization mechanism for all-dielectric metamaterials. [31,32] When the ferromagnetic resonance of the ferrite takes place, a negative permeability appears. Many factors can influence the FMR of the magnetic materials, including the bias magnetic field, magnetocrystalline anisotropy field, and demagnetization field. Hence, ferrite metamaterials with dual-band, multiband, or tunable properties can be obtained, providing a way to resolve the narrow band problem. Besides, mechanisms such as indefinite media or crystal lattice vibration have also been used to realize all-dielectric metamaterials. [33,34] When determining the realization mechanism for an all-dielectric metamaterial, one crucial factor must be considered: the choice of a fabrication method. Moreover, to achieve different performances, many types of materials with specific electromagnetic properties are used to prepare all-dielectric metamaterials. [35] Hence, researchers have developed various techniques for the fabrication of all-dielectric metamaterials derived from different materials. [36-40] In addition, the fabrication requirements are quite different for all-dielectric metamaterials operating at frequencies ranging from the microwave to optical regions. In particular, the size of the metamaterial unit cell is much smaller than the operational wavelength, making the fabrication technology for all-dielectric metamaterials become the key to their further application. Here, we present a comprehensive review of the various techniques used to produce all-dielectric metamaterials. We review the existing fabrication technologies for microwave, terahertz, and optical all-dielectric All-dielectric metamaterials with low loss are a rapidly developing research hotspot in the field of metamaterials, and offer additional design freedom for electromagnetic devices. Many types of fabrication techniques are used to prepare all-dielectric metamaterials, so as t...

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“…The absorption band of MAs has extended from the microwave band [ 15 ] to the terahertz [ 16 , 17 , 18 , 19 ], infrared [ 20 , 21 , 22 ], visible [ 23 ], and ultraviolet [ 24 ] bands. MAs have various features: tunable [ 25 ], cross-band absorption [ 26 ], polarization-insensitive [ 27 , 28 , 29 ], oblique-incidence [ 30 , 31 , 32 , 33 ], etc. Additionally, MAs apply multi-sized resonators [ 34 , 35 , 36 ] to realize ultra-broadband and high absorptivity in the mid-infrared range.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband Mid-Infrared Metamaterial Absorber Based on Multi-Sized Resonators

et al. 2022

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Mid-infrared metamaterial absorbers have many applications in the field of infrared detection, infrared thermal energy utilization, radiation refrigeration, invisible camouflage, etc. In this study, we designed an ultra-broadband mid-infrared metamaterial absorber based on multi-sized resonators. The structure of the absorber consisted of a gold substrate and nine resonators. The simulated results showed that the absorptivity of the absorber was higher than 90% in the 8.33–15.09 μm waveband with an average absorptivity of 95.17%. The energy distributions of the electric and magnetic fields were introduced to investigate the physics of broadband absorption. Moreover, we combined the multi-layer structure with the plane random arrangement structure to achieve a balance between thickness and width. Our study further illustrates the potential application of multi-sized resonators in metamaterial absorbers to realize high absorptivity and ultra-broadband to improve the performance of devices applied in infrared detection, radiation refrigeration, and other fields.

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Water-injected all-dielectric ultra-wideband and prominent oblique incidence metamaterial absorber in microwave regime

Cited by 70 publications

References 41 publications

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

All‐Dielectric Metamaterial Fabrication Techniques

Ultra-Broadband Mid-Infrared Metamaterial Absorber Based on Multi-Sized Resonators

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