All-dielectric ultra-broadband metamaterial absorber based on imidazole ionic liquids

Yang, Erqi; Yang, Fulong; Pei, Junjie; Zhang, Xiaoping; Liu, Shiming; Deng, Yuanfu

doi:10.1088/1361-6463/ab2d9a

Cited by 13 publications

(8 citation statements)

References 35 publications

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“…As the former research focus, the ground-free all-dielectric absorbers are more environmentally friendly and integrative in the manufacturing process than the absorbers fabricated with both dielectric and metal [44,45]. To further investigate the potential possibility of PWMMA for a ground-free alldielectric absorber, we obtain the ground-free PWMMA by removing the copper plate of PWMMA and keeping other geometric parameters unchanged.…”

Section: Basic Absorption Characteristicsmentioning

confidence: 99%

Multi-functional tunable ultra-broadband water-based metasurface absorber with high reconfigurability

Wen¹,

Ren²,

Peng³

et al. 2022

J. Phys. D: Appl. Phys.

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Promising microwave ultra-broadband water-based metasurface absorbers have attracted increasing attention due to their novel applications in EM radiation prevention, stealth technology, and energy harvesting. In this paper, the proposed water-based metasurface absorber, composed of mushroom-shaped and layer-shaped water with resin shell, can reach over 90% polarization-insensitive and wide-angle absorption from 7.2 to 100 GHz with a relative bandwidth of 173%. Moreover, the proposed absorber is reconfigurable to control the water content, salinity, and type of inside liquid for tunable absorption and infrared radiation with thermally tunable absorption. Since the experimental and simulated ultra-broadband absorption originates from multiple resonances concentrated on the top, the ground-free all-dielectric design is achieved. Furthermore, the proposed curved absorber is fabricated and demonstrated for omnidirectional absorption. The water-based metasurface absorber shows great potential in achieving both microwave and infrared radiation camouflage for practical shaped structures in both civil and military domains.

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Section: Basic Absorption Characteristicsmentioning

confidence: 99%

Multi-functional tunable ultra-broadband water-based metasurface absorber with high reconfigurability

Wen¹,

Ren²,

Peng³

et al. 2022

J. Phys. D: Appl. Phys.

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“…An all‐dielectric metamaterial based on ionic liquids can realize ultra‐wideband absorption with insensitive polarization and oblique incidence properties. [ 68 ]…”

Section: Microwave All‐dielectric Metamaterials Fabrication Techniquesmentioning

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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“…Room temperature ionic liquids (ILs), as an emerging class of functional liquids typically composed of bulky organic cations and inorganic or organic anions, present a promising alternative. Their broad temperature range, recyclability, thermal stability, and ionic conductivity [33][34][35][36] make them suitable candidates for LMMAs [37][38][39][40]. Gong and Yang et al [37,38] conducted experimental measurements on several imidazole ILs with varying anions and cations.…”

Section: Introductionmentioning

confidence: 99%

“…This ILMMA also demonstrated polarization insensitivity and a wide incidence angle. Remove the metallic ground to block the propagation of electromagnetic waves, Yang et al [40] used 1-ethyl-3-methylimidazolium tetrafluoroborate to create an all-dielectric ultra-broadband ILMMA. This design achieved over 90% absorption from 13.9 to 50.0 GHz, functioning effectively across a spectrum of polarization angles (0 • -90 • ) and incident angles (0 • -60 • ).…”

Section: Introductionmentioning

confidence: 99%

Imidazole ionic liquids-based ultra-broadband metamaterial absorbers from cross-architecture design

Guan,

Li,

Zou

et al. 2024

J. Phys. D: Appl. Phys.

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Room temperature ionic liquids (ILs) characterized by high dielectric loss factors and conductivity emerge as promising candidates for liquid-based metamaterial absorbers (LMMAs). In this work, the IL 1-ethyl-3-methyl-imidazolium dicyanamide was employed to construct an IL-based LMMA, leveraging a cross-architecture (C-A) design paradigm. Numerical analyses reveal that the C-A ILMMA achieves an absorption efficiency exceeding 90% within the frequency range of 7.5-57.8 GHz, translating to a relative absorption bandwidth of 153%. Moreover, the symmetrical configuration of the C-A ILMMA ensures its robust performance across a comprehensive range of polarization angles (0° to 90°), thereby underscoring its polarization insensitivity. Even with an increased incident angle of 60°, the C-A ILMMA sustains an absorption rate above 85% within the frequency intervals of 9.0-13.3 GHz and 24.7-60.0 GHz, highlighting its broad incident angle absorption capability. Owing to the superior thermal stability of the IL, the C-A ILMMA consistently maintains an absorption rate of over 90% across a temperature gradient from 20 °C to 100 °C. Mechanistic investigations reveal that the optimal absorption of the C-A ILMMA predominantly stems from dielectric polarization loss and the ionic current induced within the ILs. Subsequent experimental evaluations corroborate that the C-A ILMMA exhibits an absorptivity in excess of 90% over an ultra-broadband frequency spanning 10 to 40 GHz, aligning closely with numerical predictions. This IL-based C-A ILMMA not only augments the absorption bandwidth substantially but also enhances the adaptability of ILMMA in more rigorous environments, attributed to the commendable physicochemical properties of ILs.

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All-dielectric ultra-broadband metamaterial absorber based on imidazole ionic liquids

Cited by 13 publications

References 35 publications

Multi-functional tunable ultra-broadband water-based metasurface absorber with high reconfigurability

Multi-functional tunable ultra-broadband water-based metasurface absorber with high reconfigurability

All‐Dielectric Metamaterial Fabrication Techniques

Imidazole ionic liquids-based ultra-broadband metamaterial absorbers from cross-architecture design

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