Tunable dual-band terahertz graphene absorber with guided mode resonances

doi:10.1088/1674-1056/abaee2

Abstract A tunable dual-band terahertz absorber is designed and investigated. The unit cell of the proposed absorber consists of a graphene monolayer on a guided-mode resonant filter. The graphene absorber presents >40% absorption at two resonance frequencies, which is attributed to the guided mode resonances with different mode numbers. The electric field intensity distribution is analyzed to disclose the physical mechanism of such a dual-band absorption effect. Furthermore, the influence of optical properties of graphene, including Fermi level and relaxation time, on the absorption spectra are investigated. Finally, the influence of geometric parameters on the absorption spectrum is studied, which will provide useful guidance for the fabrication of this absorber. We believe that the results may be useful for developing the next-generation graphene-based optoelectronic devices.

Keywords: dual-band graphene guided mode resonance spectrum selective absorption

Received: 26 June 2020
Revised: 30 July 2020
Accepted manuscript online: 13 August 2020

PACS:	42.79.Dj	(Gratings)
	42.25.Bs	(Wave propagation, transmission and absorption)
	81.05.ue	(Graphene)
	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61405217), the Zhejiang Provincial Natural Science Foundation, China (Grant No. LY20F050001), the Anhui Polytechnic University Research Startup Foundation, China (Grant No. 2020YQQ042), and the Pre-research Project of Natural Science Foundation of Anhui Polytechnic University, China (Grant No. Xjky2020021).

Corresponding Authors: ^†Corresponding author. E-mail: mailswj2011@163.com

Cite this article:

Jun Wu(吴俊), Xia-Yin Liu(刘夏吟), and Zhe Huang(黄喆) Tunable dual-band terahertz graphene absorber with guided mode resonances 2021 Chin. Phys. B 30 014202

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Tunable dual-band terahertz graphene absorber with guided mode resonances

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