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Open AccessArticle

A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays

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College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
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Engineering Research Center of Gansu Provence for Intelligent Information Technology and Application, Northwest Normal University, Lanzhou 730070, China
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School of Science, Lanzhou University of Technology, Lanzhou 730050, China
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School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
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Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(3), 533; https://doi.org/10.3390/nano10030533
Received: 19 January 2020 / Revised: 10 March 2020 / Accepted: 14 March 2020 / Published: 17 March 2020
(This article belongs to the Section Nanophotonics: Characterization, Modelling, and Nanodevices)
In this paper, we demonstrate a tunable periodic hourglass-shaped graphene arrays absorber in the infrared (IR) and terahertz (THz) frequency bands. The effects of graphene geometric parameters, chemical potentials, periods, and incident angles on the pure absorption characteristics are studied by using the Finite Difference Time Domain (FDTD) method. In addition, this paper also analyzes the pure absorption characteristics of bilayer graphene arrays. The simulation results show that the maximum absorption reaches 38.2% for the monolayer graphene structure. Furthermore, comparing the bilayer graphene structure with the monolayer structure under the same conditions shows that the bilayer structure has a tunable dual-band selective absorption effect and has a higher maximum absorption of 41.7%. Moreover, it was found that there are dual-band tunable absorption peaks at 21.6   μ m and 36.3   μ m with the maximum absorption of 41.7% and 11%. The proposed structure is a convenient method which could be used in the design of graphene-based optoelectronic devices, biosensors, and environmental monitors. View Full-Text
Keywords: graphene; metamaterial absorber; surface plasmon resonance; finite difference time domain graphene; metamaterial absorber; surface plasmon resonance; finite difference time domain
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MDPI and ACS Style

Qi, Y.; Zhang, Y.; Liu, C.; Zhang, T.; Zhang, B.; Wang, L.; Deng, X.; Wang, X.; Yu, Y. A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays. Nanomaterials 2020, 10, 533.

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