A High <i>Q</i>-factor Metamaterial Absorber and Its Refractive Index Sensing Characteristics

Zhu, Huali; Zhang, Yong; Ye, Longfang; Li, Yukun; Dang, Zhang; Xu, Ruimin; Yan, Bo

doi:10.1109/tmtt.2022.3218041

Cited by 21 publications

(5 citation statements)

References 35 publications

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“…It may be able to inform you absolutely whether the frequency selection can be used for sensing. As the Q value increases, so does the detecting capabilities [20]. Table 5 shows the Q value for each frequency range, as well as a clari cation of the Q value.…”

Section: Study Of Design Parametersmentioning

confidence: 99%

“…Based on the absorption rates (the changeover % and the re ection), it is feasible to tailor for an excellent factor. The measure of quality factor can be calculated using Q = f/FWHM [20], where, FWHM is the full width at half maximum and f is the resonance frequency. Given the designs of the MMAs outlined above, one of the suggested design issues for MMA is sensitivity to varying polarisations and incident oblique angles.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz 8/9/12/14/16 Band Metamaterial Absorber with a Simple Structure and a High Q-Factor

2023

Preprint

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Terahertz Eight-/Nine-/Twelve-/Fourteen-/Sixteen-Band Metamaterial Absorber (MMA) for sensing applications is built and simulated. The substrate is sandwiched between the bottom ground plane and the top patch structure of this primitive MMA. The top patch is made up of two concentric circular ring resonators. This structure generates a multiple number of multi bands without utilising stacked layers, multiple resonators, or overlapping in a single unit cell by altering the radius of the top patch structure within the shorter frequency range of 0.8 to 1.2 THz. The polarisation and angle insensitivity properties are investigated by shifting the angle values from 0 to 90 degrees. To learn about the inside mechanism of the planned structure, the Magnetic field distribution, Electric field distribution and Surface current distribution plots are explained. For sixteen band MMA, the Q-Factor and full width half maximum are also determined. This proposed MMA will be used in biosensing applications, sensors and wireless communications.

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Section: Study Of Design Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz 8/9/12/14/16 Band Metamaterial Absorber with a Simple Structure and a High Q-Factor

2023

Preprint

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“…G is the antenna gain, D is the antenna radiation direction coefficient, and Q r is radiation loss [33].…”

Section: Enhancement Suppression Boundary Of Gainmentioning

confidence: 99%

Stereoscopic UWB Yagi–Uda Antenna with Stable Gain by Metamaterial for Vehicular 5G Communication

Shen

Dou

et al. 2023

Sensors

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In this paper, a stereoscopic ultra-wideband (UWB) Yagi–Uda (SUY) antenna with stable gain by near-zero-index metamaterial (NZIM) has been proposed for vehicular 5G communication. The proposed antenna consists of magneto-electric (ME) dipole structure and coaxial feed patch antenna. The combination of patch antenna and ME structure allows the proposed antenna can work as a Yagi–Uda antenna, which enhances its gain and bandwidth. NZIM removes a pair of C-notches on the surface of the ME structure to make it absorb energy, which results in two radiation nulls on both sides of the gain passband. At the same time, the bandwidth can be enhanced effectively. In order to further improve the stable gain, impedance matching is achieved by removing the patch diagonally; thus, it is able to tune the antenna gain of the suppression boundary and open the possibility to reach the most important characteristic: a very stable gain in a wide frequency range. The SUY antenna is fabricated and measured, which has a measured −10 dBi impedance bandwidth of approximately 40% (3.5–5.5 GHz). Within it, the peak gain of the antenna reaches 8.5 dBi, and the flat in-band gain has a ripple lower than 0.5 dBi.

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“…Giessen et al [25] were the first to use a single-band absorber to sense different concentrations of hydrogen. Later, more sensors for different purposes were proposed, such as sensing temperature [26][27][28], material thickness [29][30][31], and material refractive index [32][33][34]. In recent studies, metamaterial absorbers for sensing refractive index incorporated graphene, making sensors even more outstanding.…”

Section: Introductionmentioning

confidence: 99%

Graphene metasurface for broadband absorption and terahertz sensing

Ren

Zhao

et al. 2023

Phys. Scr.

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A plasmon-induced terahertz metamaterial absorber is proposed. The bottom ground layer uses gold to block the transmission of terahertz incident waves, and the pattern layer and the ground layer are separated by topas. The 90% absorption bandwidth frequency range of the absorber is 4.6-7.7THz, and the average absorption rate in this range is 97.6%. Due to the geometric symmetry of the absorber, it has polarization insensitivity. In addition, when the incidence Angle reaches 60 degrees, more than 80% absorption can still be maintained. The numerical simulation shows that the frequency shift of the absorber has a good linear relationship with the change of the refractive index of the proposed absorber, and the sensitivity is 1100GHz per refractive index unit (GHz/RIU). Therefore, the absorber can be used in more complex electromagnetic scenarios, or as a sensing element.

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A High Q-factor Metamaterial Absorber and Its Refractive Index Sensing Characteristics

Cited by 21 publications

References 35 publications

Terahertz 8/9/12/14/16 Band Metamaterial Absorber with a Simple Structure and a High Q-Factor

Terahertz 8/9/12/14/16 Band Metamaterial Absorber with a Simple Structure and a High Q-Factor

Stereoscopic UWB Yagi–Uda Antenna with Stable Gain by Metamaterial for Vehicular 5G Communication

Graphene metasurface for broadband absorption and terahertz sensing

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