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

Liu, Wenwen; Song, Zhengyong; Wang, Weihua

doi:10.1088/1402-4896/abe74f

Cited by 10 publications

(8 citation statements)

References 36 publications

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“…[160,161,369] Stacking Methods with Less than 10 Pairs of Metal-Insulator for Broadband Absorption: Breaking the space limitations of conventional MIM-typed BMAs at the vertical level often brings unexpected benefits in broadband absorption. A high-performance BMA based on multilayer graphene squares was reported, [370] which is formed by four layers of graphene squares, in which the widths of graphene squares are gradually increased with the stacked layers. The graphene-based BMA could provide the ability to achieve more than 90% absorption at frequencies from 1.45 to 4.35 THz.…”

Section: Vertical Design Strategies For Broadband Metamaterials Absor...mentioning

confidence: 99%

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Wang

Duan

et al. 2023

Adv Funct Materials

114

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Metamaterial absorbers have been widely studied and continuously concerned owing to their excellent resonance features of ultra-thin thickness, light-weight, and high absorbance. Their applications, however, are typically restricted by the intrinsic dispersion of materials and strong resonant features of patterned arrays (mainly referring to narrow absorption bandwidth). It is, therefore essential to reassert the principles of building broadband metamaterial absorbers (BMAs). Herein, the research progress of BMAs from principles, design strategies, tunable properties to functional applications are comprehensively and deeply summarized. Physical principles behind broadband absorption are briefly discussed, typical design strategies in realizing broadband absorption are further emphasized, such as top-down lithography, bottom-up self-assembly, and emerging 3D printing technology. Diversified active components choices, including optical response, temperature response, electrical response, magnetic response, mechanical response, and multi-parameter responses, are reviewed in achieving dynamically tuned broadband absorption. Following this, the achievements of various interdisciplinary applications for BMAs in energy-harvesting, photodetectors, radar-IR dual stealth, bolometers, noise absorbing, imaging, and fabric wearable are summarized. Finally, the challenges and perspectives for future development of BMAs are discussed.

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Section: Vertical Design Strategies For Broadband Metamaterials Absor...mentioning

confidence: 99%

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Wang

Duan

et al. 2023

Adv Funct Materials

114

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show abstract

“…Graphene, as a two-dimensional nanomaterial, has excellent optical and electrical properties such as high carrier mobility, low loss, and an ultrafast optical response time [30][31][32]. When a bias voltage is added to the surface of graphene, the Fermi level of graphene varies with the external voltage, which results in the continuous regulation of conductivity over a wide frequency range [33][34][35][36][37][38][39][40][41]. Graphene has been widely used to construct tunable PAs, mainly including multi-band and broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Wang,

Qin,

Zhao

et al. 2024

Photonics

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In this paper, a five-band metamaterial absorber with a tunable function in a terahertz band is proposed, which consists of a gold grounding layer, a polyimide dielectric layer, and a periodic patterned graphene layer. The patterned graphene layer is constructed from two sets of copper-coin-shaped structures of different sizes. The designed absorber achieves absorptions of 96.4%, 99.4%, 99.8%, 98.4%, and 99.9% at 4.62 THz, 7.29 THz, 7.70 THz, 8.19 THz, and 8.93 THz, respectively, with an average absorption intensity of 98.78%. The physical mechanism of this five-band absorber was explained by the impedance matching principle and electric field distribution. The absorption performance of the five-band absorber can be effectively tuned by changing the geometry of the patterned graphene array and the thickness of the dielectric layer. Given that the resonant frequency of the absorber varies in proportion to the Fermi level, by varying the Fermi level of the graphene hypersurface, we can achieve the continuous tuning of the absorption performance over a wide frequency range. The five-band absorber has a stable absorption performance over a wide incidence angle of 0–65°, and by combining the merits of high absorption, dynamic adjustability, and a large number of absorption peaks, the given absorber could have great potential for applications in nondestructive testing, imaging, communication, sensing, and detectors.

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“…In various functional meta-devices, perfect absorbers [13][14][15][16][17] and polarization converters [18][19][20][21][22] are primary components mainly used for manipulating THz waves [23][24][25] in several fields. Graphene carbonbased nanomaterial has a two-dimensional (2D) honeycomb structure comprising a single layer of carbon atoms.…”

Section: Introductionmentioning

confidence: 99%

Graphene-Based Active Tunable Metasurfaces for Dynamic Terahertz Absorption and Polarization Conversion

Wei¹,

Tian²,

Huang³

2023

Journal of Renewable Materials

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Simultaneous broadband absorption and polarization conversion are crucial in many practical applications, especially in terahertz communications. Thus, actively tunable metamaterial systems can exploit the graphene-based nanomaterials derived from renewable resources because of the flexible surface conductivity and selective permeability of the nanomaterials at terahertz frequencies. In this paper, we propose a graphene-based active tunable bifunctional metasurface for dynamic terahertz absorption and polarization conversion. The graphene ring presents a certain opening angle (A) along the diagonal of the xoy plane. When A = 0°, the proposed metasurface behaves as a broadband absorber. Numerical results show the feasibility of achieving this polarization-insensitive absorber with nearly 100% absorptance, and the bandwidth of its 90% absorptance is 1.22 THz under normal incidence. Alternatively, when A = 40°after optimization, the proposed metasurface serves as a broadband polarization convertor, resulting in robust broadband polarization conversion ratio (PCR) curves with a bandwidth surpassing 0.5 THz in the reflection spectrum. To tune the PCR response or the broad absorption spectrum of graphene, we change the Fermi energy of graphene dynamically from 0 to 0.9 eV. Furthermore, both the broadband absorption and the linear polarization conversion spectra of the proposed metasurface exhibit insensitivity to the incident angle, allowing large incident angles within 40°under high-performance operating conditions. To demonstrate the physical process, we present the impedance matching theory and measure electric field distributions. This architecture in the THz frequency range has several applications, such as in modulators, sensors, stealth, and optoelectronic switches. THz wave polarization and beam steering also have broad application prospects in the field of intelligent systems.

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

Cited by 10 publications

References 36 publications

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Graphene-Based Active Tunable Metasurfaces for Dynamic Terahertz Absorption and Polarization Conversion

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