Graphene-based tunable multi-band metamaterial polarization-insensitive absorber for terahertz applications

Jain, P. L.; Bansal, Shonak; Prakash, Krishna; Sardana, Neha; Gupta, Neena; Kumar, Sanjeev; Singh, Arun K.

doi:10.1007/s10854-020-03742-8

Cited by 42 publications

(20 citation statements)

References 55 publications

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“…RCS is a critical factor in evaluating stealth performance. Metasurfaces can offer another way to reduce RCS with their polarized rotation properties 16 which is different from absorber 17–19 . In earlier studies, passive polarized rotating structures are realized including narrowband and broadband.…”

Section: Introductionmentioning

confidence: 99%

Band‐notched frequency‐selective absorber with linear polarization rotation function

Jin

Kong

Wang

et al. 2022

Int J RF Mic Comp-Aid Eng

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This article presents a novel band‐notched frequency‐selective absorber (BFSA) with linear polarization rotation function in‐band and absorption out‐of‐band. When used as an antenna reflector, the BFSA can not only reduce RCS outside of the antenna's working band, but also reduce co‐polarized RCS within the working band and improve cross‐polarized reflection. The BFSA realizes −0.41 dB linear polarization‐rotating reflection at 4.5 GHz. In the upper and lower bands, the BFSA realizes a broad absorption function from 2.2 GHz to 4.1 GHz and 5.03 GHz to 6.5 GHz. The fractional bandwidth of linear co‐polarization reflection is 98.8% with 10 dB reflection reduction. The experimental measurements are conducted to validate the polarization conversion of the band‐notched absorbers, and good agreement between theory and measurement results is observed.

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Section: Introductionmentioning

confidence: 99%

Band‐notched frequency‐selective absorber with linear polarization rotation function

Jin

Kong

Wang

et al. 2022

Int J RF Mic Comp-Aid Eng

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“…6 Since then, several MMAs have been proposed to improve the compactness, thickness and absorption peaks of the structure from microwave to visible frequencies. [7][8][9][10][11][12][13] Metamaterial absorbers are usually arranged in periodic arrays of resonators printed on a substrate with a ground plane at the bottom. The metallic resonator and dielectric substrate are excited by the incident electric and magnetic field, respectively.…”

Section: Introductionmentioning

confidence: 99%

An Ultrathin Compact Polarization-Sensitive Triple-band Microwave Metamaterial Absorber

Jain

Singh

Pandey

et al. 2021

Journal of Elec Materi

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In this study, an ultra-compact metamaterial absorber (MMA) has been proposed for microwave applications comprising two modified square-shaped resonators printed on a dielectric substrate and terminated by a metallic plane. The proposed MMA exhibits perfect absorption at 3.36 GHz, 3.95 GHz and 10.48 GHz, covering Sand X-band applications. The absorber is ultracompact (0.112 k) in size and ultra-thin (0.018 k) in thickness at the lowest resonating frequency. The normalized impedance, constitutive electromagnetic parameters, electric field and surface current distribution have been studied to understand the physical mechanism of the triple-band absorption. Furthermore, the absorber is analyzed with different polarization and incident angles for transverse electric waves. The proposed MMA has been experimentally demonstrated to verify the results obtained from simulations. Moreover, the effect of over-layer thickness is investigated to examine the sensing application of the absorber.

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“…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%

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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Graphene-based tunable multi-band metamaterial polarization-insensitive absorber for terahertz applications

Cited by 42 publications

References 55 publications

Band‐notched frequency‐selective absorber with linear polarization rotation function

Band‐notched frequency‐selective absorber with linear polarization rotation function

An Ultrathin Compact Polarization-Sensitive Triple-band Microwave Metamaterial Absorber

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

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