A high-performance broadband terahertz absorber based on single layer cross-shaped graphene

You, Bin; Zhang, Rui; Wang, Shengchuan; Han, Kui; Shen, Xiaopeng

doi:10.1016/j.ijleo.2021.167249

Cited by 13 publications

(6 citation statements)

References 41 publications

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“…The permittivity (ε) is changed by putting different materials in one plane. As a result, the structure is much simpler than those reported before. − …”

Section: Resultsmentioning

confidence: 89%

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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“…The permittivity (ε) is changed by putting different materials in one plane. As a result, the structure is much simpler than those reported before. − …”

Section: Resultsmentioning

confidence: 89%

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

Chen

Sun

et al. 2022

ACS Appl. Electron. Mater.

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“…Regarding broadband wave absorber, the design based on plasmonic coupling is wildly used, in which the resonators are usually aligned either horizontally or vertically [13][14][15][16][17][18]. Thus, they can also be classified as HD absorber and VD absorber.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, * Author to whom any correspondence should be addressed. such achievements have greatly promoted the development of plasmonic devices with designed functionalities, such as super lens [9], ultra-sensitive detector [10], single-molecule sensor [11], efficient polarizer [12], broadband absorber [13][14][15][16][17][18], and so on. However, due to the limitation of their optical response, plasmonics based on these noble metals does not support active tunability, and is mostly demonstrated from the visible to near-infrared ranges [19], in which the Ohmic loss is inevitable.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic coupling in graphene nanoribbon dimers

You

Zhang

Wang

et al. 2021

J. Opt.

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Plasmonics in graphene nanostructures has shown great promise for terahertz and mid-infrared applications. In order to achieve multiple functionalities and broad operating bandwidth, the nanostructures are usually very compact, in which plasmonic coupling is inevitable and even plays an important role in performance improvement. Here, we investigate plasmonic coupling in graphene nanoribbon (GNR) dimers theoretically through full wave simulation and coupled dipole approximation. In practice, we treat GNR dimers as a pair of Lorentz type point dipoles, whose coupling is described by a phenomenological parameter (coupling strength). We show the resonance line-shape of GNR dimers can be engineered by tuning the distance, resonance frequency difference, damping rates of two GNRs. However, in both horizontally aligned dimer (HD) and vertically aligned dimer (VD), the coupling strength only depends on the distance, and exhibits an inverse relation of cube root, but due to different symmetries, they are opposite in sign. When two GNRs are placed with an increasing oblique angle, the coupling strength varies continuously from the value of HD to that of VD, and satisfies a sinusoidal function of the angle. We further discuss a general scheme to engineer broadband optical response through tuning damping rates of two GNRs, namely, larger damping rate for lower frequency resonance in HD, while on the contrary in VD. Our results provide a basic understanding of plasmonic coupling in graphene nanostructures, and will stimulate graphene plasmonic applications at terahertz and mid-infrared frequency range.

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“…However, they are usually designed with a structure of graphene-insulator-metal, where the bottom metal layer, besides serving as a back gate for electrostatic gating, acts also as a reflector to block the light transmission. Taking absorption as an example, due to localized GPs, a single layer of pattern graphene can achieve maximum 50% light absorption, whereas by adding a metal layer, the absorption can be improved to 100% [46][47][48]. This 50% light absorption is a universal limit for any thin films in symmetric environment, and to break this limit, a common strategy is to prohibit light transmission using a metal layer.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency light manipulation using a single layer of folded graphene microribbons

Xue,

Wang

2024

Phys. Scr.

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Since its one-atom thickness, it remains an open question to enhance light matter interactions in graphene, which is usually implemented through external resonant structures such asFabry-Perot cavity. Here, we propose an alternative scheme to enhance light matter interactions in a single layer of folded graphene microribbons (FGMRs), and remarkably, for normal incidences rather than oblique incidences in most studies. By optimizing structural parameters (e.g., the location of folding axis and folding angle), three light manipulations such as perfect absorption, perfect reflection, and perfect transmission can be achieved independently. More interestingly, any one of the three functionalities can be actively switched to the other via changing material parameters (Fermi level and carrier mobility ), which is actually the most attractive feature of graphene plasmonics. Finally, we showFGMRs can also support triple functionalities, i.e., via changing material parameters, one of the three functionalities can be switched to the second one and then the third one. Our results will be of great interest to fundamental physics and pave the way for graphene plasmonic device applications.

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A high-performance broadband terahertz absorber based on single layer cross-shaped graphene

Cited by 13 publications

References 41 publications

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

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

Plasmonic coupling in graphene nanoribbon dimers

High-efficiency light manipulation using a single layer of folded graphene microribbons

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