A Dual-Band Terahertz Absorber with Two Passbands Based on Periodic Patterned Graphene

Ximeng Zhang,Zhangbiao Yang,Naichang Yuan,Weiwei Wu,Guang Sun,Yuhong Ma,Chenxin Li,Chang Wang

doi:10.3390/ma12183016

Ximeng Zhang, Zhangbiao Yang + Show 6 more

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https://doi.org/10.3390/ma12183016

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Journal: Materials	Publication Date: Sep 17, 2019
Citations: 16	License type: CC BY 4.0

Affiliation: National University of Defense Technology

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In this paper, a dual-band terahertz absorber with two passbands is proposed. The absorber is composed of periodic patterned graphene arrays on the top of a SiO substrate and a frequency selective surface (FSS) on the bottom of the substrate. The simulated results indicate that there are two absorption bands (absorption greater than 90%) ranging from 0.54 to 0.84 THz and 2.13 to 2.29 THz. It is almost transparent to incident waves (transmission greater than 50%) below 0.19 THz and between 1.3 and 1.67 THz with a center frequency of 1.49 THz. The absorber has a good tolerance to the transverse electric (TE) and transverse magnetic (TM) polarized wave oblique incidence, and the transmission rate of the passbands remains greater than 50% within 70 degrees. Moreover, the absorption rate of the absorber can be tuned by the chemical potential of graphene. The structure with absorption and transmission properties has potential applications in filtering, sensing, detecting and antenna stealth.

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Metamaterials (MMs) are artificially designed sub-wavelength electromagnetic (EM) structures.MMs have attracted considerable attention over the past decade due to their exotic properties, such as negative refraction, double negative behavior, left-handed behavior and backward wave propagation [1,2,3,4,5], and their promising applications
The numerical simulation results are obtained by the frequency domain finite element method (FEM) solver of the CST Microwave Studio
The two reflection band frequencies of frequency selective surface (FSS) are near the absorption band frequencies of graphene, so the FSS is equivalent to a ground plane at the absorption bands

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Metamaterials (MMs) are artificially designed sub-wavelength electromagnetic (EM) structures.MMs have attracted considerable attention over the past decade due to their exotic properties, such as negative refraction, double negative behavior, left-handed behavior and backward wave propagation [1,2,3,4,5], and their promising applications. Absorbers with graphene ribbons and disks are proposed in [10,11,12,13,14,15,16,17] Since these designs have only one resonance of surface plasmon polaritons (SPPs), the absorption bandwidths are narrow. To achieve a wider absorption bandwidth, multi-resonator graphene structures have been proposed in [18,19]. Different absorption peaks can be obtained by resonators with a small difference in one unit cell Another method is to place different sizes of graphene periodic patterns at different heights in the substrate [20,21,22,23].

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