An Ultra-Wideband Terahertz Metamaterial Absorber Based on the Fractal Structure

Liu, Hou-Bing; Hu, Caixing; Wang, Zilong; Zhang, Haifeng; Li, Haiming

doi:10.1007/s11468-020-01288-3

Cited by 11 publications

(7 citation statements)

References 28 publications

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“…Finally, the achievements in broadband terahertz absorbers have been compared with our work in Table . The absorbers with single metal usually have a high absorption (>90%) but a small bandwidth (<1 THz) in the simulations, while the performances degrade a lot in their experimental counter parts. − , Combining Si and Ti materials can achieve the absorption of more than 75% with a bandwidth of 1.9 THz in the experiments (Table ). Above all, a large broadband and high absorption absorber is proven, which indicates not only the probability of usage in the terahertz broadband absorber but also a feasible and scalable method for preparing terahertz microstructures and metamaterials.…”

Section: Resultsmentioning

confidence: 99%

“…However, the fabrication process of the laminated structures is usually time-consuming and high-cost. As an alternative, the fractional structure in a plane can extend the absorption bandwidth by increasing fractal branches . Although the bandwidth can be extended, the complex fractional structure will cost a lot in the manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative, the fractional structure in a plane can extend the absorption bandwidth by increasing fractal branches. 35 Although the bandwidth can be extended, the complex fractional structure will cost a lot in the manufacturing process. In addition, the hybrid structure is developed to extend the absorption bandwidth by combining the advantages of laminate and fractional structures.…”

Section: Introductionmentioning

confidence: 99%

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Microtopography-Guided Chessboard-like Structure for a Broadband Terahertz Absorber

Chen

Sun

et al. 2022

ACS Appl. Electron. Mater.

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Broadband absorber in the terahertz frequency is highly required for applications in imaging, detecting, and electromagnetic stealth. The limitations for developing the absorber are not only the complex geometric structure and multimaterials themselves but also the timeconsuming, expensive, and inaccurate manufacturing. Herein, a chessboard-like structure with an alternate distribution of Ti and Si materials in the plane is proposed. This quite simple microscale structure exhibits a large absorption in the terahertz range, which can work as an efficient broadband absorber. To fabricate the absorber, we have proposed a microtopographic substrate-guided method which possesses low-cost and high accuracy capacities. Finally, the proposed absorber exhibits above 60% absorption in 0.1−4 THz, while larger than 75% absorption is achieved in 2.1−4 THz. The similarity of the experimental and simulated absorption is up to 92%. These performances could fulfill the requirements for the applications in electromagnetic stealth, terahertz imaging, and sensing in the future. It also indicates that the proposed fabrication method can be effectively applied in preparing terahertz microstructures and metamaterials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microtopography-Guided Chessboard-like Structure for a Broadband Terahertz Absorber

Chen

Sun

et al. 2022

ACS Appl. Electron. Mater.

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show abstract

Section: Introductionmentioning

confidence: 99%

“…With the development of terahertz (THz) techniques and materials, various MM-based THz devices have been deployed and designed to manipulate THz waves over the past few decades [20][21][22][23][24]. Among these architectures, in general, the MM structures can be divided into two types: reflection [21,22] and transmission [23,24]. However, most THz devices usually can only work in static (reflection/transmission state), and thus have a single function making them difficult to change once fabricated, which severely hamper their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Photo-Excited Switchable Terahertz Metamaterial Polarization Converter/Absorber

Dong

You-de

et al. 2021

Crystals

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In this paper, a photo-excited switchable terahertz metamaterial (MM) polarization converter/absorber has been presented. The switchable structure comprises an orthogonal double split-ring resonator (ODSRR) and a metallic ground, separated by a dielectric spacer. The gaps of ODSRR are filled with semiconductor photoconductive silicon (Si), whose conductivity can be dynamically tuned by the incident pump beam with different power. From the simulated results, it can be observed that the proposed structure implements a wide polarization-conversion band in 2.01–2.56 THz with the conversion ratio of more than 90% and no pump beam power incident illuminating the structure, whereas two absorption peaks operate at 1.98 THz and 3.24 THz with the absorption rates of 70.5% and 94.2%, respectively, in the case of the maximum pump power. Equivalent circuit models are constructed for absorption states to provide physical insight into their operation. Meanwhile, the surface current distributions are also illustrated to explain the working principle. The simulated results show that this design has the advantage of the switchable performance afforded by semiconductor photoconductive Si, creating a path towards THz imaging, active switcher, etc.

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Metamaterial-Based Terahertz Absorbers for Refractive Index Sensing: Types, Mechanism, and Applications

Shruti,

Pahadsingh,

Appasani

2024

Plasmonics

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An Ultra-Wideband Terahertz Metamaterial Absorber Based on the Fractal Structure

Cited by 11 publications

References 28 publications

Microtopography-Guided Chessboard-like Structure for a Broadband Terahertz Absorber

Microtopography-Guided Chessboard-like Structure for a Broadband Terahertz Absorber

Photo-Excited Switchable Terahertz Metamaterial Polarization Converter/Absorber

Metamaterial-Based Terahertz Absorbers for Refractive Index Sensing: Types, Mechanism, and Applications

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