A tunable dual-band THz absorber based on graphene sheet and ribbons

Xiao, Binggang; Lin, Hongya; Xiao, Long; Gu, Mingyue; Yang, Dongxu; Hu, Lianzhe; Guo, Fenglei; Mi, Hongmei

doi:10.1007/s11082-018-1638-2

Cited by 9 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The device is modeled and simulated using the full-vector finite element method. In the calculation, the relative dielectric constant of SiO 2 is 𝜀 𝑟 = 3.9 [24], and the conductivity of gold is 𝜎 = 4.7 × 10 7 𝑠/𝑚 [25]. Unit cell boundary conditions are used in the 𝑥 and 𝑦 directions, while open (add space) boundary condition is used in the 𝑧 direction.…”

Section: Structure and Designmentioning

confidence: 99%

Metamaterial with dual stealth functions in infrared and terahertz bands

Bai,

Liu,

Tang

et al. 2024

Preprint

View full text Add to dashboard Cite

In this study, an electromagnetic metamaterial with infrared (IR) passive stealth and terahertz (THz) active stealth functions is proposed. The device comprises an infrared stealth layer (IRSL) made of ZnS and SiO2, and a terahertz absorbing layer (TAL) utilizing a "graphene-SiO2-gold" sandwich-like structure. The properties of the metamaterials are investigated using the full-vector finite element method. The results indicate that the emissivity of the device is close to zero in the infrared atmospheric window (8 ~ 14 μm), with an absorption of up to 88% and a bandwidth of 2.54 THz at the center frequency of 3.98 THz. Furthermore, the device exhibited polarization insensitivity and tolerance to wide-angle incidence. These advantages make it suitable for applications in the THz radar and stealth fields.

show abstract

Section: Structure and Designmentioning

confidence: 99%

Metamaterial with dual stealth functions in infrared and terahertz bands

Bai,

Liu,

Tang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…However, most of these graphene-based absorbers have only one absorption band, and their absorption efficiency is relatively low. To improve the light absorption efficiency, or to increase the number of the absorption bands of graphene, more complicated structures, such as multilayer structures [22,23,24,25] and cascaded graphene patterns [26,27,28,29] are proposed. However, these structures rely multilayer optical coatings or multileveled graphene patterns, which reliance results in additional challenges in fabrication.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Angle-Insensitive and Tunable Dual-Band THz Absorber Using Periodic Cross-Shaped Graphene Arrays

et al. 2019

View full text Add to dashboard Cite

A dual-band terahertz (THz) absorber using the periodic cross-shaped graphene arrays is presented. It is shown that the dual-band light absorption enhancement of graphene results from the edge graphene plasmon (EGP) resonance, and the locations of the two absorption peaks can be precisely estimated by using the Fabry-Pérot (F-P) cavity model. Slight residual reflection remains at the two absorption peaks because the input impedance of the cross-arm cannot be perfectly matched with the free space impedance. In addition, the locations of the two absorption bands can be simultaneously tuned by changing the Fermi level of graphene, and they can be independently tuned by changing the width or the length of the cross-arm of graphene. Excellent angle-insensitivity dual-band absorption enhancement of graphene can be maintained for both the transverse electric (TE) and transverse magnetic (TM) polarizations.

show abstract

Dielectric‐Based Metamaterials for Near‐Perfect Light Absorption

Wang,

Qin,

Duan

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

The emergence of metamaterials and their continued prosperity have built a powerful working platform for accurately manipulating the behavior of electromagnetic waves, providing sufficient possibility for the realization of metamaterial absorbers with outstanding performance. However, metamaterial absorbers composed of metallic materials typically possess many unfavorable factors, such as non‐adjustable absorption, easy oxidation, low‐melting, and expensive preparation costs. The selection of dielectric materials provides excellent alternatives due to their remarkable properties, thus dielectric‐based metamaterial absorbers (DBMAs) have attracted much attention. To promote breakthroughs in DBMAs and guide their future development, this work systematically and deeply reviews the recent research progress of DBMAs from four different but progressive aspects, including physical principles; classifications, material selections and tunable properties; preparation technologies; and functional applications. Five different types of theories and related physical mechanisms, such as Mie resonance, guided‐mode resonance, and Anapole resonance, are briefly outlined to explain DBMAs having near‐perfect absorption performance. Mainstream material selections, structure designs, and different types of tunable DBMAs are highlighted. Several widely utilized preparation methods for customizing DBMAs are given. Various practical applications of DBMAs in sensing, stealth technology, solar energy absorption, and electromagnetic interference suppression are reviewed. Finally, some key challenges and feasible solutions for DBMAs’ future development are provided.

show abstract

A tunable dual-band THz absorber based on graphene sheet and ribbons

Cited by 9 publications

References 21 publications

Metamaterial with dual stealth functions in infrared and terahertz bands

Metamaterial with dual stealth functions in infrared and terahertz bands

Numerical Study of Angle-Insensitive and Tunable Dual-Band THz Absorber Using Periodic Cross-Shaped Graphene Arrays

Dielectric‐Based Metamaterials for Near‐Perfect Light Absorption

Contact Info

Product

Resources

About