Five-Band Terahertz Perfect Absorber Based on Metal Layer–Coupled Dielectric Metamaterial

Zhang, Yubin; Cen, Chunlian; Liang, Cuiping; Yi, Zao; Chen, Xifang; Tang, Yongjian; Yi, Tao; Yi, Yougen; Luo, Wei; Xiao, Shuyuan

doi:10.1007/s11468-019-00956-3

Cited by 26 publications

(13 citation statements)

References 53 publications

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“…6 (a) and (b), respectively. The absorption response is analyzed with the change in substrate thickness from 4.7 to 5.0 μm suggesting red shift phenomenon with the increase in thickness as the resonating frequency is inversely proportional to the substrate thickness [16]. The absorption peaks shift towards the lower frequencies with the increase in the a as wavelength is directly proportional to unit cell dimension.…”

Section: Resultsmentioning

confidence: 96%

“…In refs. [11,15,16,24], multi-band absorbers were proposed by utilizing multiple resonators of different size. However, these approaches suffer from technical difficulties due to larger size and thickness which limits practical applications.…”

Section: Resultsmentioning

confidence: 99%

“…Metamaterial absorber (MMA) has drawn significant attention in THz range due to its perfect absorption properties which are difficult to find in natural materials. The first MMA was demonstrated by Landy et al which attracts considerable attention [9] and since then, different kinds of MMAs have been proposed including single [10], dual- [11][12][13], triple- [14], quad- [15], penta-band [16], broadband [17], tunable [18] and polarization insensitive [11] absorbers. Among these, multi-band MMA with polarization insensitive characteristics have found great attention due to their use in applications such as materials detection [19], sensing of harmful gas [20] and spectroscopic imaging [21].…”

Section: Introductionmentioning

confidence: 99%

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Design of an Ultra-thin Hepta-band Metamaterial Absorber for Sensing Applications

Jain¹,

Prakash²,

Gupta³

et al. 2021

Preprint

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An ultra-thin metamaterial absorber (MMA) comprises of a split-ring-cross (SRC)-shaped resonator coupled with graphene and dielectric layer backed by metallic ground plane is presented for hepta-band applications. The proposed absorber demonstrates multiple absorption peaks at 2.33, 5.24, 7.74, 8.25, 10.05, 10.97 and 12.61 THz with average absorption more than 96 % . The physical mechanism of the hepta-band absorption is analyzing by electric field distribution and attributed to the combination of dipolar and LC resonance. Furthermore, the effect of geometric parameters is analyzed to validate the optimal selection of the structural parameters. In addition, proposed MMA is analyzed for different incident and polarization angles suggesting that absorption response is insensitive to polarization angles. Compared with the previously reported MMAs, proposed design is ultra-thin (0.036λ) and compact (0.21λ) at the lowest operational frequency. The absorptivity at 12.61 THz is 99.81 % and the corresponding quality (Q) factor is 31.52 for a bandwidth of 0.40 THz. The proposed absorber can be potentially utilized in detection, sensing and imaging. Moreover, sensing performance of the proposed MMA has been investigated using overlayer thickness and overlayer permittivity.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of an Ultra-thin Hepta-band Metamaterial Absorber for Sensing Applications

Jain¹,

Prakash²,

Gupta³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…There are many ways to decouple the bands. A five-band tunable terahertz metamaterial absorber composed of an absorbing layer, a metal layer, and a dielectric layer is proposed in [18]. However, as the incident frequency increases, the resonant mode of the absorber also changes.…”

Section: Introductionmentioning

confidence: 99%

Single-Layer Dual-Band Wide Band-Ratio Reflectarray With Orthogonal Linear Polarization

Yang

2020

IEEE Access

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In this letter, a single-layer broadband wide band-ratio (ratio of f higher to f lower ) reflectarray that can achieve different linear polarizations at the X-band and the K-band is designed. Its elements consist of a split square loop with two square shaped phase delay lines (outer structure) and a phoenix square loop (inner structure) operating at the X-band and the K-band, respectively. The ingeniousness of the design is that the outer structure and the inner structure can achieve a 0 • − 360 • phase shift by adjusting the phase shift lines and the side length of the inner square ring, respectively. At the same time, they do not affect each other in space. Different polarizations corresponding to the two structures are orthogonal to each other, so their electrical performances do not affect each other. To verify our design concept, the reflectarray is fabricated and measured in a microwave anechoic chamber. The simulated and measured results are in good agreement. The measured gains are 23.6 dBi at 10 GHz (f lower ) with aperture efficiency of 48%, and 30.6 dBi at 22 GHz(f higher ) with aperture efficiency of 43%. The 1-dB gain bandwidths are 20% (9.1 GHz-11.1 GHz) at the X-band and 19% (19.8 GHz-23.9 GHz) at the K-band. The band-ratio of the reflectarray is 2.2. A single-layer dual-band wide band-ratio reflectarray with dual-linear polarization is confirmed.

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“…Light scattering of small particles has been the focus of many studies in optical communication, biophysics, astrophysics, and materials science [1][2][3]. Effective control of optical radiation at the sub-wavelength scale, e.g., suppression of unwanted backward scattering (BS) and enhanced directed forward scattering (FS), is one of the critical issues in research fields related to particle scattering and plays an important role in applications such as sensors [4][5][6][7], nanoantennas [8,9], photovoltaic devices [10], and light-emitting devices [11].…”

Section: Introductionmentioning

confidence: 99%

Dual-band directional scattering with all-dielectric trimer in the near-infrared region

et al. 2019

Appl. Opt.

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A silicon trimer is explored to tailor unidirectional forward scattering at multiple wavelengths in the near-infrared region with low loss using theoretical calculations and numerical simulations, which leads to the dramatic enhancement in unidirectional forward scattering and suppression of backward scattering. The higher moments in the trimer can be properly excited and balanced by breaking the symmetry of the trimer. The generalized Kerker conditions at two different wavelengths can be achieved in the trimer to further improve the scattering directivity. Our results provide insights into future development of all-dielectric low-loss nanoantennas in the near-infrared region.

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Five-Band Terahertz Perfect Absorber Based on Metal Layer–Coupled Dielectric Metamaterial

Cited by 26 publications

References 53 publications

Design of an Ultra-thin Hepta-band Metamaterial Absorber for Sensing Applications

Design of an Ultra-thin Hepta-band Metamaterial Absorber for Sensing Applications

Single-Layer Dual-Band Wide Band-Ratio Reflectarray With Orthogonal Linear Polarization

Dual-band directional scattering with all-dielectric trimer in the near-infrared region

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