Design of a dual-band terahertz metamaterial absorber using two identical square patches for sensing application

Wang, Ben‐Xin; He, Yongfeng; Lou, Pengcheng; Xing, WenHui

doi:10.1039/c9na00770a

Cited by 238 publications

(86 citation statements)

References 53 publications

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“…Moreover, reconfigurable absorbers can be designed by tunable devices or materials 16 , 17 . Such great features made MMAs a promising candidate for various applications in the frequency spectrum, from microwaves to optical signals 18 – 21 . Since MMAs are made of periodic arrays of resonators, they can only realize efficient absorption in a narrow bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable honeycomb metamaterial absorber having incident angular stability

Shabanpour

Beyraghi

Oraizi

2020

Sci Rep

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Ultrawide-angle electromagnetic wave absorbers with excellent mechanical properties are required in many diverse applications such as sensing, and stealth technologies. Here, a novel 3D reconfigurable metamaterial absorber (MMA) consisting of honeycomb and VO2 films is proposed. The proposed MMA exhibits a strong absorptivity above 90% in the widest incident angle up to $$87^\circ $$ 87 ∘ for TM- and TE polarized oblique incidences for THz wave propagating in yoz-plane. Under normal incidence, when VO2 films are in the insulating state, the proposed absorber exhibits high absorptivity in the frequency band of 1–4 THz. By increasing the temperature of the whole structure, the structural transformation of VO2 occurs and turns into the metallic phase. We have shown that under oblique incidence, the ohmic losses of VO2 films especially those parallel to the direction of the incident electric field are the most important absorption principles of the proposed MMA. Due to the ultra wide-angle absorption (angular stability) and mechanical performance, it is expected that the presented MMA may find potential applications, such as camouflage technologies, electromagnetic interference, imaging, and sensing. To the best knowledge of authors, the proposed MMA configuration exhibits the absorptivity in the widest incident angle ever reported.

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Section: Introductionmentioning

confidence: 99%

Reconfigurable honeycomb metamaterial absorber having incident angular stability

Shabanpour

Beyraghi

Oraizi

2020

Sci Rep

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“…In 2008, a perfect MA was first presented by Landy et al [13]. Subsequently, different types of MAs, such as single-band [14,15], dual-band [16][17][18][19][20][21], multi-band [22][23][24][25][26][27], and wideband absorbers [28][29][30][31][32][33][34][35][36], have been presented by various researchers. Among these MAs, multi-band MAs enable perfect absorption at several discrete frequencies, enabling applications like multiband sensing.…”

Section: Introductionmentioning

confidence: 99%

An Ultrathin, Triple-Band Metamaterial Absorber with Wide-Incident-Angle Stability for Conformal Applications at X and Ku Frequency Band

Deng

Sun

et al. 2020

Nanoscale Res Lett

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An ultrathin and flexible metamaterial absorber (MA) with triple absorption peaks is presented in this paper. The proposed absorber has been designed in such a way that three absorption peaks are located at 8.5, 13.5, and 17 GHz (X and Ku bands) with absorption of 99.9%, 99.5%, and 99.9%, respectively. The proposed structure is only 0.4 mm thick, which is approximately 1/88, 1/55, and 1/44 for the respective free space wavelengths of absorption frequency in various bands. The MA is also insensitive due to its symmetric geometry. In addition, the proposed structure exhibits minimum 86% absorption (TE incidence) within 60° angle of incidence. For TM incidence, the proposed absorber exhibits more than 99% absorptivity up to 60° incidence. Surface current and electric field distributions were investigated to analyze the mechanism governing absorption. Parameter analyses were performed for absorption optimization. Moreover, the performance of the MA was experimentally demonstrated in free space on a sample under test with 20 × 30 unit cells fabricated on a flexible dielectric. Under normal incidence, the fabricated MA exhibits near perfect absorption at each absorption peak for all polarization angles, and the experimental results were found to be consistent with simulation results. Due to its advantages of high-efficiency absorption over a broad range of incidence angles, the proposed absorber can be used in energy harvesting and electromagnetic shielding.

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“…Metamaterial shows unique properties based on the inclusion of artificially designed microstructures: lensing, negative refraction index, and cloaking 1 – 4 . Metamaterials are proposed and applied in many fields, such as absorber, sensor, and so on 5 – 13 . With the development and expansion of research, tunable metamaterial has become the focus of researchers.…”

Section: Introductionmentioning

confidence: 99%

A reconfigurable sandwich structure switchable DNA-based metamaterial

Zhong

2020

Sci Rep

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In this paper, a tunable DNA-based metamaterial is designed and simulated in 170–340 THz range. This metamaterial can be transformed from an ON mode with a low resistance state of the DNA strip to its OFF mode with a high resistance state. Three Structures with containing different combinations metal layers are designed and simulated. Structure 1 with Ag/DNA/Ag and Au/DNA/Au strategies achieves field enhancement factors (FEF) 2.18 and 2.07, respectively. Structure 2 (Au/DNA/Dirac, Dirac/DNA/Au, Ag/DNA/Dirac, or Dirac/DNA/Ag) achieves the FEF values 14.11, 10.70, 13.75, or 9.62, respectively, while the FEF value of Structure 3 with Dirac/DNA/Dirac reaches 59.8. The FEF value of Structure 3 can be modulated from 59.8 to 91.96 as Fermi energy increasing from 0 to 60 meV. Moreover, the FEF value is also enhanced through increasing the magnetic field strength. The Structure 3 exhibits convertibility and sustainable modulation lines between two opposing patterns. The proposed structure reveals a switchable feature based on the resistance characteristics of DNA strips, which can be revealed as an ON/OFF switch sensor. Moreover, the switching performance of Structures 3 and 2 is significantly higher than Structure 1. Therefore, Structures 3 and 2 can be set to be an optical memristor or optical gate.

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Design of a dual-band terahertz metamaterial absorber using two identical square patches for sensing application

Abstract: Dual-band terahertz metamaterial absorber with very sensitive sensing ability in terms of the surrounding index is demonstrated.

Cited by 238 publications

References 53 publications

Reconfigurable honeycomb metamaterial absorber having incident angular stability

Reconfigurable honeycomb metamaterial absorber having incident angular stability

An Ultrathin, Triple-Band Metamaterial Absorber with Wide-Incident-Angle Stability for Conformal Applications at X and Ku Frequency Band

A reconfigurable sandwich structure switchable DNA-based metamaterial

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