A broadband terahertz metamaterial absorber enabled by the simple design of a rectangular-shaped resonator with an elongated slot

Wang, Ben‐Xin; Tang, Chao; Niu, Q. Jason; He, Yongfeng; Chen, Runye

doi:10.1039/c9na00385a

Cited by 58 publications

(21 citation statements)

References 33 publications

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“…In the airborne field, a variety of sound absorption structures such as Helmholtz resonators (Li et al, 2018;Huang et al, 2019) and Fabry-Pérot resonators (Long et al, 2019;Kumar and Lee, 2020;Liu et al, 2020), have shown the capability of perfect and broadband absorption. The emergence of acoustic metamaterials shows a new method for broadband sound absorption (Wang et al, 2019(Wang et al, , 2020(Wang et al, , 2021. Many other metamaterials broadband low-frequency absorbers have been proposed and researched (Mei et al, 2012;Yang et al, 2017;Huang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

A Composite Perforated Partitioned Sandwich Panel With Corrugation for Underwater Low-Frequency Sound Absorption

Wang

Chen

2021

Front. Mech. Eng.

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Underwater acoustic wave absorption and control play an important role in underwater applications. Various types of underwater acoustic metamaterials have been proposed in recent years with the vigorous development of acoustic metamaterials. Compared with airborne sound, underwater sound waves have a longer wavelength and much smaller propagation loss, making them more difficult to control. In addition, given that the acoustic impedance of water is much greater than that of air, numerous conventional materials and structures are not suited to underwater use. In this paper, we propose a composite structure based on an excellent broadband low-frequency sound absorber of air using aluminum mixed with rubber. Our composite structure possesses broadband low-frequency (<1,000 Hz) sound absorption underwater, omnidirectional high sound absorption coefficient under the oblique incidence (0–75°), and pressure resistance. It has promising applications for underwater acoustic wave control and contributes to the design of underwater acoustic metamaterials.

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Section: Introductionmentioning

confidence: 99%

A Composite Perforated Partitioned Sandwich Panel With Corrugation for Underwater Low-Frequency Sound Absorption

Wang

Chen

2021

Front. Mech. Eng.

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“…The former resonant response may have applications in sensing [11], imaging [12], and color filtering [13], while the latter correspondent is promising in the areas of solar cells [14], photochemical devices [15], hot-electron-based photodetectors [16], and radiative cooling [17]. Such MPAs have been developed from visible [18,19] to terahertz [20,21] and the microwave regions [22,23]. MPAs can be physically realized by suppressing both the transmission and reflection of the incident electromagnetic (EM) waves, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Active Tuning from Narrowband to Broadband Absorbers Using a Sub-wavelength VO2 Embedded Layer

et al. 2021

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Metamaterial perfect absorbers (MPAs) with dynamic thermal tuning features are able to control the absorption performance of the resonances, providing diverse applications spanning from optical switches and filters to modulators. In this paper, we propose an MPA with diverse functionalities enabled by vanadium dioxide (VO 2 ) embedded in a metal-dielectric plasmonic structure. For the initial design purpose, a silicon (Si) nanograting on a silver (Ag) mirror is proposed to have multiple resonant responses in the near infrared (NIR) region. Then, the insertion of a thin VO 2 layer at the right position enables the design to act as an on/off switch and resonance tuner. In the insulator phase of VO 2 , in which the permittivity data of VO 2 is similar to that of Si, a double strong resonant behavior is achieved within the NIR region. By increasing the temperature, the state of VO 2 transforms from insulator to metallic so that the absorption bands turn into three distinct resonant peaks with close spectral positions. Upon this transformation, a new resonance emerges and the existing resonance features experience blue/ red shifts in the spectral domain. The superposition of these peaks makes the overall absorption bandwidth broad. Although Si has a small thermo-optic coefficient, owing to strong light confinement in the ultrasmall gaps, a substantial tuning can be achieved within the Si nanogratings. Therefore, the proposed hybrid design can provide multi-resonance tunable features to cover a broad range and can be a promising strategy for the design of linearly thermal-tunable and broadband MPAs. Owing to the proposed double tuning feature, the resonance wavelengths exhibits great sensitivity to temperature, covering a broad wavelength range. Overall, the proposed design strategy demonstrates diverse functionalities enabled by the integration of a thin VO 2 layer with plasmonic absorbers.

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“…Metamaterial as an artificial medium exhibits some exotic properties such as negative permittivity, negative permeability, negative refractive index, which makes it suitable for various applications such as absorber 1 , microwave imaging 2 , bio sensing 3 , antennas 4 , metamaterial lensing 5 , metamaterial coding 6 , terahertz metamaterial absorber 7 – 9 , and microwave devices like Bluetooth, WiMAX, GPS 5 , 10 . A negative index metamaterial is present in 11 that consists of elongated beams attached to a plate.…”

Section: Introductionmentioning

confidence: 99%

Symmetric resonator based tunable epsilon negative near zero index metamaterial with high effective medium ratio for multiband wireless applications

Moniruzzaman

Islam

Hossain

et al. 2021

Sci Rep

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In this paper, a tuned metamaterial (MTM) consisting of a symmetric split ring resonator is presented that exhibits epsilon negative (ENG), near zero permeability and refractive index properties for multiband microwave applications. The proposed metamaterial is constituted on a Rogers (RT-5880) substrate with 1.57 mm thickness and the electrical dimension of 0.14λ × 0.14λ, where wavelength, λ is calculated at 4.2 GHz. The symmetric resonating patch is subdivided into four equal and similar quartiles with two interconnecting split rings in each quartile. The quartiles are connected at the center of the substrate with a square metal strip with which four tuning metal strips are attached. These tuning metal strips are acted as spacers between four quartiles of the resonator patch. Numerical simulation of the proposed design is executed in CST microwave studio. The proposed MTM provides four resonances of transmission coefficient (S21) at 4.20 GHz, 10.14 GHz, 13.15 GHz, and 17.1 GHz covering C, X and Ku bands with negative permittivity, near zero permeability and refractive index. The calculated effective medium ratio (EMR) is 7.14 at 4.2 GHz indicates its compactness. The resonance frequencies are selective in nature which can be easily tuned by varying the length of the tuning metal stubs. The equivalent circuit of the proposed MTM is modelled in Advanced Design Software (ADS) that exhibits a similar S21 compared with CST simulation. Surface current, electric and magnetic fields are analyzed to explain the frequency tuning property and other performances of the MTM. Compact size, ENG with near zero permeability and refractive index along with frequency selectivity through tuning provides flexibility for frequency selective applications of this MTM in wireless communications.

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A broadband terahertz metamaterial absorber enabled by the simple design of a rectangular-shaped resonator with an elongated slot

Cited by 58 publications

References 33 publications

A Composite Perforated Partitioned Sandwich Panel With Corrugation for Underwater Low-Frequency Sound Absorption

A Composite Perforated Partitioned Sandwich Panel With Corrugation for Underwater Low-Frequency Sound Absorption

Active Tuning from Narrowband to Broadband Absorbers Using a Sub-wavelength VO2 Embedded Layer

Symmetric resonator based tunable epsilon negative near zero index metamaterial with high effective medium ratio for multiband wireless applications

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