Switching and extension of transmission response, based on bending metamaterials

Hwang, Jang‐Sun; Kim, Y. J.; Yoo, Young Joon; Kim, K. W.; Rhee, Joo Yull; Chen, L. Y.; Lee, Y. P.

doi:10.1038/s41598-017-03824-4

Cited by 11 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electric conductivity of copper is 5.8 × 10 5 S cm −1 [ 55 ]; ε 0 is 8.854 × 10 −12 F m −1 [ 56 ]. The magnetic permeability is minuscule and close to zero ( Figure S5 ), and the relative permeability of the nonmagnetic material is close to one [ 57 ].…”

Section: Resultsmentioning

confidence: 99%

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride–Ti3C2Tx MXene–Carbon Nanotube Composites by Improving Impedance Matching and Conductivity

et al. 2023

View full text Add to dashboard Cite

Absorption-dominated electromagnetic interference (EMI) shielding is attained by improving impedance matching and conductivity through structural design. Polyvinylidene fluoride (PVDF)–Ti3C2Tx MXene–single-walled carbon nanotubes (SWCNTs) composites with layered heterogeneous conductive fillers and segregated structures were prepared through electrostatic flocculation and hot pressing of the PVDF composite microsphere-coated MXene and SWCNTs in a layer-by-layer fashion. Results suggest that the heterogeneous fillers improve impedance matching and layered coating, and hot compression allows the MXene and SWCNTs to form a continuous conducting network at the PVDF interface, thereby conferring excellent conductivity to the composite. The PVDF-MXene-SWCNTs composite showed a conductivity of 2.75 S cm−1 at 2.5% MXene and 1% SWCNTs. The EMI shielding efficiency (SE) and contribution from absorption loss to the total EMI SE of PVDF-MXene-SWCNTs were 46.1 dB and 85.7%, respectively. Furthermore, the PVDF-MXene-SWCNTs composite exhibited excellent dielectric losses and impedance matching. Therefore, the layered heteroconductive fillers in a segregated structure optimize impedance matching, provide excellent conductivity, and improve absorption-dominated electromagnetic shielding.

show abstract

Section: Resultsmentioning

confidence: 99%

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride–Ti3C2Tx MXene–Carbon Nanotube Composites by Improving Impedance Matching and Conductivity

et al. 2023

View full text Add to dashboard Cite

show abstract

“…This phenomenon allows for a very narrow transparency resonance in the absorption * Author to whom any correspondence should be addressed. spectrum, which is highly desirable for sensing applications [3][4][5][6][7]. Also such a transparency feature is accompanied by extreme dispersion, which enables slowing down or even completely stopping light.…”

Section: Introductionmentioning

confidence: 99%

Dual-band electromagnetically induced transparent metamaterial with slow light effect and energy storage

Zheng¹,

Ma²,

Lv³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The realization of electromagnetically induced transparency (EIT) on metamaterial has special properties, such as strong slow-light, frequency-selection and so on, which make EIT widely used in the fields of slow-light, optical storages and filters. In this paper, a metamaterial with two pairs of split ring resonators (SRRs) and one cut-wire (CW) is designed to achieve dual-band EIT effect at 0.5~2.14 GHz and 0.4~2.10 GHz with independently tunable bandwidths of 1.64 GHz and 2.7GHz, respectively. The coupled Lorentz model is adopted to principally study the coupling characteristics between dark and bright modes. It is shown that the coupling strength between the dark and bright modes could be modulated by the coupling distance, which make the dual-band transparent window could be independently modulated by only changing the coupling distance between the bright and dark mode. The group delay and energy storage are also simulated by setting the Gaussian pulse signal passing through the EIT structure. The results show that the group delay of the designed EIT structure is 16.9 times that of the same thickness of dielectric material. The manufactured metamaterial is tested in a microwave anechoic chamber. The experimental and theoretical results are well consistent. These results could be beneficial for the development of EIT research toward some up-and-coming novel slow-light, optical storage, sensor and optical filter applications.

show abstract

“…Electromagnetic (EM) metamaterials (MMs), artificially engineered by periodically-arranged meta-elements which are smaller than the operating wavelength, exhibits special responses to the incident EM wave, such as negative-refraction index [1], chirality [2], extraordinary optical transmission [3], electromagnetically induced transparency [4], and so forth. The designed structures, structural parameters, and properties of employed materials determine the electric permittivity [ eff ðωÞ] and the magnetic permeability [μ eff ðωÞ] of overall MMs, based on the effective medium theory [5].…”

Section: Introductionmentioning

confidence: 99%

Flexible ultrathin metamaterial absorber for wide frequency band, based on conductive fibers

Kim

Hwang

Khuyen

et al. 2018

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

Flexible and ultrathin wide-band metamaterial absorbers are suggested and demonstrated in the microwave-frequency range. By using resonators of different sizes and conductive fibers on metallic-pattern layer, the total thickness of metamaterial absorber is reduced to be only 1/349 with respect to the operating wavelength at 0.97 GHz. We present the absorption mechanism in terms of the impedance matching with the free space, the distributions of surface current and the three-dimensional distributions for power loss. In simulation, the absorption was over 97% at 0.97-6.12 GHz, and the corresponding experimental absorption band over 97% was 0.87-6.11 GHz. Furthermore, the dielectric substrate of metamaterial absorbers was replaced with flexible substrate in order to have the flexibility and the broadband absorption properties. The absorption band is expanded and the high-absorption performance maintains at the same time. The total thickness of metamaterial absorber comes to be only 1/5194 of the operating wavelength at 0.75 GHz. Our work is expected to contribute to the flexible microwave/electronic devices in the near future.

show abstract

Switching and extension of transmission response, based on bending metamaterials

Cited by 11 publications

References 29 publications

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride–Ti3C2Tx MXene–Carbon Nanotube Composites by Improving Impedance Matching and Conductivity

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride–Ti3C2Tx MXene–Carbon Nanotube Composites by Improving Impedance Matching and Conductivity

Dual-band electromagnetically induced transparent metamaterial with slow light effect and energy storage

Flexible ultrathin metamaterial absorber for wide frequency band, based on conductive fibers

Contact Info

Product

Resources

About