A polarization-insensitive dual plasmon-induced transparency terahertz sensor based on graphene metamaterial

Chen, Tao; Wang, Juncheng; Liang, Dihan

doi:10.1016/j.optcom.2023.129622

Cited by 10 publications

(2 citation statements)

References 60 publications

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“…Terahertz technology between microwave and infrared radiation frequencies has recently generated substantial interest within the engineering community [1][2][3]. This attention comes from using dynamic materials such as semiconductors, graphene, and liquid crystals [4][5][6][7][8][9][10][11]. However, a fundamental challenge in the practical application of THz technology is the absence of natural materials capable of direct interaction with THz waves.…”

Section: Introductionmentioning

confidence: 99%

Enhancing broadband terahertz absorption via a graphene-based metasurface absorber featuring a rectangular ring and triple crossbars

Chou Chau

2024

Phys. Scr.

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This study introduces an innovative strategy to achieve a versatile and adaptive terahertz (THz) absorber by leveraging a graphene-based metasurface. This metasurface comprises a rectangular ring and three crossbars, combined with a grounded gold film, all separated by a thin SiO2 layer. The phenomenon of plasmonic hybridization, involving surface and cavity plasmon resonances, enables the interaction between incident THz waves and the proposed graphene-based metasurface, leading to a substantial enhancement in the absorptance bandwidth of the plasmonic system. The enhancement of absorptance can be finely adjusted by modifying the chemical potential (Fermi energy) in graphene and manipulating the structural parameters of the device. A notable feature of our design is its inherent resistance to variations in incident angles and polarization states of incoming electromagnetic waves. The proposed device achieves an absorptance exceeding 80% across a continuous spectrum, exhibiting a bandwidth of approximately 0.90 THz spanning from 0.94 to 1.84 THz. This robust characteristic ensures consistent and reliable performance in diverse scenarios. Our findings present intriguing prospects for various applications centered on wave modulation, which encompass, but are not limited to, THz imaging, filtering, energy harvesting, and tunable sensors.

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Section: Introductionmentioning

confidence: 99%

Enhancing broadband terahertz absorption via a graphene-based metasurface absorber featuring a rectangular ring and triple crossbars

Chou Chau

2024

Phys. Scr.

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“…Table II presents the comparison of the proposed sensor with other reported RI sensors in the THz range, including their working mechanisms, working band, tunability, material selection, structure, number of sensing peaks, and sensing sensitivity. [27][28][29][30][31][32] By comparing and analyzing, the sensor proposed here has the following advantages:…”

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confidence: 99%

Graphene-based tunable tri-band terahertz refractive index sensor

Fu,

Zhang,

Niu

et al. 2024

AIP Advances

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A tunable tri-band terahertz refractive index sensor based on graphene is proposed and designed. The structure of the sensor comprises a gold (Au) substrate layer, a dielectric layer (Topas), and a graphene pattern layer. The numerical simulation results demonstrate that the sensor exhibits three narrowband absorption peaks at 1.68, 3.82, and 4.78 THz, and the corresponding absorption rate can reach 99.9%, 98.0%, and 97.9%, respectively. By adjusting the Fermi level of graphene, the resonant frequency of the sensor can be effectively tuned. Notably, due to the rotational symmetry of the structure, the sensor shows insensitivity to transverse magnetic and transverse electric polarizations of incident light. By varying the refractive index of surrounding analytes, the sensor’s sensitivity and Figure of Merit (FOM) are studied. The sensitivities of the three resonance peaks are 0.59, 1.19, and 1.38 THz/RIU, with corresponding FOM values of 2.57, 3.40, and 6.58, respectively. Furthermore, the feasibility and effectiveness of the designed sensor in practical applications are verified by testing five types of samples. These findings indicate that the proposed sensor has superior performance in sensitivity and selectivity, which makes it have a great potential for applications in the fields of material characterization, environmental monitoring, and biomedicine detection in the terahertz band.

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High-Sensitivity Sensor Based on Plasmon-Induced Transparency in Terahertz Borophene Metasurface

Pan,

Chen,

Yang

et al. 2023

Plasmonics

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A polarization-insensitive dual plasmon-induced transparency terahertz sensor based on graphene metamaterial

Cited by 10 publications

References 60 publications

Enhancing broadband terahertz absorption via a graphene-based metasurface absorber featuring a rectangular ring and triple crossbars

Enhancing broadband terahertz absorption via a graphene-based metasurface absorber featuring a rectangular ring and triple crossbars

Graphene-based tunable tri-band terahertz refractive index sensor

High-Sensitivity Sensor Based on Plasmon-Induced Transparency in Terahertz Borophene Metasurface

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