Graphene-metasurface for wide-incident-angle terahertz absorption
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Frontiers of Information Technology & Electronic Engineering www.jzus.zju.edu.cn; engineering.cae.cn; www.springerlink.com ISSN 2095-9184 (print); ISSN 2095-9230 (online) E-mail: [email protected]
Graphene-metasurface for wide-incident-angle terahertz absorption* Ri-hui XIONG1, Xiao-qing PENG2, Jiu-sheng LI†‡1 1
Center for THz Research, China Jiliang University, Hangzhou 310018, China 2
State Grid Sichuan Electric Power Company, Chengdu 610041, China †
E-mail: [email protected]
Received Apr. 6, 2020; Revision accepted June 10, 2020; Crosschecked Aug. 18, 2020
Abstract: We demonstrate a graphene-metasurface structure for tunable wide-incident-angle terahertz wave absorption, which involves depositing planar arrays of Omega-shaped graphene patterns on a silicon dioxide substrate. We also discuss how the graphene Fermi-level layer and various substrates affect the absorption characteristics. The absorption of the proposed terahertz absorber is above 80% at an incident angle of 0–60° in frequencies ranging from 0.82 to 2.0 THz. Our results will be very beneficial in the application of terahertz wave communications and biomedical imaging/sensing systems. Key words: Graphene-metasurface; Terahertz absorber; Omega-shaped graphene patterns https://doi.org/10.1631/FITEE.2000079 CLC number: O436.2
1 Introduction Terahertz wave absorbers have attracted much attention because of the prospect of their broad application in terahertz wave detection, imaging, and biomedical sensing (Esquius-Morote et al., 2014; He XY et al., 2019; Zhou et al., 2019). Recently, various terahertz absorbers have been proposed based on metamaterials (Hu et al., 2014; He YN et al., 2015; He XY, 2020b). However, these absorbers have a finite terahertz bandwidth and a certain terahertz frequency. Once these terahertz wave devices are designed, the dynamic tenability can be controlled only by changing the geometries. However, in many practical applications, robust tunable terahertz absorbers are very important. Recently, some tunable graphene-based terahertz devices have been presented (Othman et al., 2013; Shi et al., 2019; He XY et al., ‡
Corresponding author Project supported by the Zhejiang Lab (No. 2019LC0AB03) © Zhejiang University and Springer-Verlag GmbH Germany, part of Springer Nature 2020 *
2020a). For example, Amin et al. (2013) demonstrated a graphene absorber based on multilayer graphene. Zhang Y et al. (2014) realized a polarizationindependent absorber using graphene with embedded cross-shaped metallic resonators. Su et al. (2015) proposed a terahertz absorber using multilayer graphene/MgO2. Long et al. (2018) demonstrated a terahertz absorber based on a graphene-metasurface hybrid structure. Liu Y et al. (2019) designed a terahertz wave absorber using multilayer graphene metamaterial. In recent years, many graphenepatterned terahertz devices have been reported (Xiao et al., 2016, 2019; Liu TT et al., 2019a, 2019b), but these works usually consider only ideal cases in simulation and cannot provide experimental results that verify
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