Metamaterials with Reprogrammable Reciprocity

Eichelberg, Austin; Watkins, Audrey A.; Bilal, Osama R.

doi:10.1103/physrevapplied.18.054049

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…As a result, it is crucial for us to explore the advancements in electromagnetic absorbing materials that can provide excellent performance in mitigating these risks. In order to accomplish this, it is essential to concentrate on developing suitable components and microstructures. − These specific materials hold promise in serving as radar-absorbing substances, particularly within the domain of stealth technology. Ideal absorption materials should possess certain characteristics in order to meet the demands of practical applications.…”

Section: Introductionmentioning

confidence: 99%

Flexible PVA/Co Ferrite/MWCNT/AC Metacomposites: High Conductivity and Low Percolation Threshold

Gholipur,

Afrouzeh

2024

ACS Appl. Electron. Mater.

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Recently, metacomposites have emerged as a promising solution for electromagnetic wave absorption due to their extraordinary electromagnetic parameters. However, the underlying paradigm and regulation mechanism for the negative and near-zero responses of real permittivity are still not clearly understood. To address this gap, this study focuses on the development of metacomposites comprising poly(vinyl alcohol) (PVA), Co ferrite, multiwalled carbon nanotubes (MWCNT), and activated carbon (AC) using a cost-effective sol−gel method based on percolation theory. An in-depth analysis of the materials revealed that the combination of a porous structure and magnetic nanoparticles in the carbon matrix had a synergetic effect. This synergistic effect resulted in a remarkable improvement in the impedance matching conditions and attenuation ability of the metacomposites. Interestingly, as the frequency increased, the value of the real permittivity switched from positive to negative in PVA/Co ferrite/MWCNT/AC metacomposites. This phenomenon can be explained by the electrical dipole resonance of the interconnected MWCNTs. As a result, the metacomposites displayed excellent electromagnetic wave absorption performance, with the electromagnetic absorption capacity significantly enhanced to −28.1095 dB for a thickness of 1 mm. Such a high level of reflection loss (RL) indicates that these metacomposites have the capability to attenuate all incoming electromagnetic radiation. Consequently, these metacomposites hold great potential for various modern devices that require highly efficient, stable, adjustable, and lightweight absorption capabilities such as memristors, light-dependent resistances, and low-frequency reflectors.

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Section: Introductionmentioning

confidence: 99%

Flexible PVA/Co Ferrite/MWCNT/AC Metacomposites: High Conductivity and Low Percolation Threshold

Gholipur,

Afrouzeh

2024

ACS Appl. Electron. Mater.

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Bi‐Stable Metamaterials with Intrinsic Memory for Selective Wave Filtering Based on Frequency and Amplitude

Stenseng,

Samak,

Bilal

2024

Advanced Science

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Analytical, numerical, and experimental methods are used to investigate the utility of metamaterials in controlling harmonic waves based on both their amplitude and frequency. By programming the metamaterials to support bi‐stable configurations (i.e., two stable phases), the required conditions are elucidated for a transition wave (i.e., a topological soliton) to nucleate due to harmonic excitation, causing a phase change within our metamaterial. As each of these phases has its own unique transmission frequency range, such phase change is harnessed to control harmonic waves based on both their amplitude and frequency. As a demonstration of principle, a low/high‐pass filter is shown by tuning the same metamaterial to change phase; from transmission to attenuation and vice versa. In addition, phase transitions taking place while preserving the metamaterial's state of attenuation or transmission are shown. Such materials can continue their functionality (i.e., either attenuation or transmission of waves) while keeping a record of extreme events that can cause their transition (i.e., have memory). These metamaterials can be useful in the next generations of advanced and functional acoustic devices.

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Carbon nanotube-carbon black/CaCu3Ti4O12 ternary metacomposites with tunable negative permittivity and thermal conductivity fabricated by spark plasma sintering

Qu,

Wu,

Xie

et al. 2023

Rare Met.

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Metamaterials with Reprogrammable Reciprocity

Cited by 9 publications

References 28 publications

Flexible PVA/Co Ferrite/MWCNT/AC Metacomposites: High Conductivity and Low Percolation Threshold

Flexible PVA/Co Ferrite/MWCNT/AC Metacomposites: High Conductivity and Low Percolation Threshold

Bi‐Stable Metamaterials with Intrinsic Memory for Selective Wave Filtering Based on Frequency and Amplitude

Carbon nanotube-carbon black/CaCu3Ti4O12 ternary metacomposites with tunable negative permittivity and thermal conductivity fabricated by spark plasma sintering

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