Ultra-broadband wide-angle terahertz absorber realized by a doped silicon metamaterial

Jiang, Mingwei; Song, Zhengyong; Liu, Qing

doi:10.1016/j.optcom.2020.125835

Cited by 44 publications

(9 citation statements)

References 27 publications

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“…36,37 Apart from structures, the materials also have a high effect on the absorber bandwidth. The normal used silicon can achieve a large bandwidth from 0.7 to 5.7 THz according to the simulation, 38 while the emerging vanadium dioxide can realize the absorptance >90% from 3.25 to 7.08 THz. 39 What is more, vanadium dioxide can be employed to control the absorption in a large band.…”

Section: Introductionmentioning

confidence: 92%

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: Introductionmentioning

confidence: 92%

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

Chen

Sun

et al. 2022

ACS Appl. Electron. Mater.

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“…The fourth is a three-layer, multi-layer, or all-dielectric structure, for which the unit cells are made of materials with low conductivity or with tunable conductivity. [53][54][55][56][57][58] Hu et al employed Cr with a conductivity of only 2.2 × 10 5 S m −1 as the material for the metal ring resonator (Figure 6g). [55] The low conductivity makes the captured energy mainly consumed in the resonators, which greatly expands bandwidth of the single absorption band.…”

Section: Broadband Tmasmentioning

confidence: 99%

Terahertz Metamaterial Absorbers

Chen

Chai

Jin

et al. 2021

Adv Materials Technologies

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Terahertz metamaterial absorbers (TMAs) can efficiently absorb electromagnetic wave in the range of 0.1–10 THz based on the tunable electromagnetic properties of artificially designed unit cells. TMAs can achieve perfect absorption, as well as broad band absorption. Specifically, TMAs can break the thickness limit of a device at a quarter wavelength, realizing ultra‐thin devices so as to facilitate integration with other systems. Accordingly, TMAs have high application value in communication, imaging, detection, security inspection, and other fields because of their characteristics of small size, perfect absorption, less restriction of natural materials, and tunable electromagnetic parameters. This review covers the fundamental principles and recent advances of TMAs, from the essential structural features of TMAs and working principle of various types of TMAs to the design and applications of corresponding structures, especially the TMAs that can be tuned by various approaches. The development trend and challenges of TMAs are briefly discussed too. It is envisioned that this review can help R&D of the future TMAs for real applications.

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“…If resonant absorption peaks from each component are very close, an ideal broadband absorption peak can be formed [5]. Broadband absorbers are also demonstrated based on doped silicon [6] and vanadium dioxide metamaterials [7]. However, it is very difficult to actively change the working frequencies of such multiband and broadband absorbers, which hinders their practical applications.…”

Section: Introductionmentioning

confidence: 99%

A high-performance broadband terahertz absorber based on multilayer graphene squares

2021

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The efficient electromagnetic absorber is highly demanded in device applications. A big challenge is to design the absorber of very thin thickness and broad bandwidth, which is even more difficult at terahertz regime. In this article, we propose and numerically (finite element method, FEM) demonstrate a high-performance broadband absorber with near-perfect absorption over terahertz band based on multilayer graphene squares. The absorber consists of four graphene layers in which the width of the square is gradually increased, and a bottom gold layer separated by a dielectric spacer. The proposed structure can achieve above 90% wave absorption for the frequencies from 1.45 THz to 4.35 THz, with a bandwidth of 2.9 THz and the bandwidth fraction of 100%. Because of symmetry of the structure, this terahertz absorber is polarization insensitive and can work at a large angle range of oblique incidence, for instance absorptance can be maintained nearly unchanged up to 40° for transverse electric polarization and up to 45° for transverse magnetic polarization. Except for the layer stacking, our design is very easy to be realized in experiment, since only the simple square shape and a uniform 0.4 eV Fermi level are used in our design, which may play an important role in future terahertz device applications.

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Ultra-broadband wide-angle terahertz absorber realized by a doped silicon metamaterial

Cited by 44 publications

References 27 publications

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

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

Terahertz Metamaterial Absorbers

A high-performance broadband terahertz absorber based on multilayer graphene squares

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