Research on dual-controlled terahertz metamaterial broadband absorber based on vanadium dioxide and graphene

Zhao, Jiateng; Yang, Hong; Shan, Xinyu; Mi, Xueling; Ma, Shilin

doi:10.1016/j.optcom.2023.129701

Cited by 10 publications

(1 citation statement)

References 43 publications

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“…Terahertz (THz) absorbers [14][15][16][17][18], which function within wavelength ranges ranging from 3 mm to 30 μm, have emerged as a focal point for various research groups, being a crucial subset within the realm of graphene-based metasurface (MS) absorbers. This surge of interest can be attributed to its extraordinary attributes, which stem from graphene's distinct gatetunable, optical, electronic, and mechanical characteristics [19][20][21][22]. These absorbers have many applications, ranging from sensing [23,24] and modulation to medical imaging [25,26], filtering [27,28], spectroscopy [29], and security [30,31].…”

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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