Tunable Dual-Band Ultrasensitive Stereo Metamaterial Terahertz Sensor

Cao, Pengfei; Wu, Yuyao; Wang, Zelong; Li, Yuan; Zhang, Jing; Liu, Qiang; Cheng, Lin; Niu, Tiaoming

doi:10.1109/access.2020.3039503

Cited by 15 publications

(7 citation statements)

References 51 publications

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“…This is because, at the dips of 1.89 THz and 2.15 THz, only the modes of LDBRs and RDSRs were strongly excited by y-direction polarized electric field, and the structural loss was mainly caused by the LDBRs and RDSRs, respectively. The results of the S-parameter inversion method based on effective refractive index model were entirely consistent with the numerical simulation results at 1.89 THz and 2.15 THz, verifying the calculations of the CST software[47].…”

supporting

confidence: 80%

Constant frequency reconfigurable terahertz metasurface based on tunable electromagnetically induced transparency-like approach

Cao

Deng

et al. 2022

Nanotechnology

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A terahertz constant frequency reconfigurable metasurface based on tunable electromagnetically induced transparency-like property was designed, whose transparency window frequency did not vary with Fermi energy. This structure was composed of two single-layer graphene resonators, namely, left double big rings (LDBRs) and right double small rings (RDSRs). An evident transparency window (EIT-like phenomenon) was caused by the near-field coupling between bright modes of the two resonators in the transmission spectrum, in which amplitude over 80% was acquired at 1.98 THz. By individually reconfiguring the Fermi energy of each resonator, the EIT-like effects, transparency window amplitude, modulation speed and group delay could be actively controlled while the frequency of EIT-like window remained constant. Significantly, the transparency window was fully modulated without changing the frequency, and the maximum modulation depth reached 78%. Furthermore, the modulation speed also increased because the total graphene area A was effectively reduced in the proposed structure. Compared with other metasurface structures, the modulation properties of the proposed structure showed higher performance while the EIT-like window frequency remained static. This research provides an alternative method for developing constant frequency reconfigurable modulation terahertz devices (such as optical switches and modulators), as well as a potential approach for miniaturization of terahertz devices.

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confidence: 80%

Constant frequency reconfigurable terahertz metasurface based on tunable electromagnetically induced transparency-like approach

Cao

Deng

et al. 2022

Nanotechnology

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“…To emphasize the distinction between the MS and the traditional detectors, Table 2 gives the performance indicators for comparison. [56][57][58][59][60]…”

Section: The Mechanistic Analysis For Sensingmentioning

confidence: 99%

An Ultra‐Wideband Janus Metastructure with Graphene for Detector Based on Anapole Mode in the Terahertz Region

Li,

Tang,

Cheng

et al. 2023

Annalen der Physik

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In this paper, an ultra‐wideband Janus metastructure (MS) utilizing anapole mode for detector in the terahertz (THz) range by graphene is proposed. Specifically, when Fermi level (Ef) is set to 0.9 eV, the MS demonstrates ultra‐broadband absorption exceeding 0.9 from 0.754 to 5 THz in the −z‐direction with a relative bandwidth of 147.6 %, in which perfect absorption of over 98% develops from 3.24 to 5 THz. In the case of the +z‐direction, the absorptivity maintains around 0.6 within the 0.745 ∼ 5 THz range. As Ef equals 0 eV, the difference in absorption between the −z‐direction and +z‐direction exceeds 0.9 from 4.49 to 4.76 THz. The study also explores the MS for refractive index sensing near 3.71 THz by a unique difference detection, measuring two refractive index ranges: 1.2 ∼ 2.6 and 4.5 ∼ 4.7, with corresponding sensitivities of 0.0450 and 0.0304, respectively. Owing to its highly symmetrical structure, the MS is insensitive to the polarization state of the electromagnetic (EM) waves, performing remarkable angular stability as the incident angle varies from 0 to 60 degrees in the −z‐direction. These splendid properties make the design a good candidate for biomedical sensing, EM cloaking, and full‐space EM wave control.

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“…It has bizarre properties beyond natural materials, including a negative refractive index [7,8], ultra-thin perfect absorption [9,10], an inverse Doppler effect [11,12], and so on. In view of the physical properties of metamaterials, in line with the current design needs for the miniaturization and integration of electronic components, a variety of metamaterial functional devices applicable to different scenarios has been widely proposed, which are of great significance for the research of stealth technology, perfect absorption [13], plasma-induced transparency [14,15], and sensors [16,17].…”

Section: Introductionmentioning

confidence: 99%

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

Wang,

Qin,

Zhao

et al. 2024

Photonics

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In this paper, a five-band metamaterial absorber with a tunable function in a terahertz band is proposed, which consists of a gold grounding layer, a polyimide dielectric layer, and a periodic patterned graphene layer. The patterned graphene layer is constructed from two sets of copper-coin-shaped structures of different sizes. The designed absorber achieves absorptions of 96.4%, 99.4%, 99.8%, 98.4%, and 99.9% at 4.62 THz, 7.29 THz, 7.70 THz, 8.19 THz, and 8.93 THz, respectively, with an average absorption intensity of 98.78%. The physical mechanism of this five-band absorber was explained by the impedance matching principle and electric field distribution. The absorption performance of the five-band absorber can be effectively tuned by changing the geometry of the patterned graphene array and the thickness of the dielectric layer. Given that the resonant frequency of the absorber varies in proportion to the Fermi level, by varying the Fermi level of the graphene hypersurface, we can achieve the continuous tuning of the absorption performance over a wide frequency range. The five-band absorber has a stable absorption performance over a wide incidence angle of 0–65°, and by combining the merits of high absorption, dynamic adjustability, and a large number of absorption peaks, the given absorber could have great potential for applications in nondestructive testing, imaging, communication, sensing, and detectors.

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Tunable Dual-Band Ultrasensitive Stereo Metamaterial Terahertz Sensor

Cited by 15 publications

References 51 publications

Constant frequency reconfigurable terahertz metasurface based on tunable electromagnetically induced transparency-like approach

Constant frequency reconfigurable terahertz metasurface based on tunable electromagnetically induced transparency-like approach

An Ultra‐Wideband Janus Metastructure with Graphene for Detector Based on Anapole Mode in the Terahertz Region

Five-Band Tunable Terahertz Metamaterial Absorber Using Two Sets of Different-Sized Graphene-Based Copper-Coin-like Resonators

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