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Open AccessArticle

A Narrow Dual-Band Monolayer Unpatterned Graphene-Based Perfect Absorber with Critical Coupling in the Near Infrared

1
Research Center for Photonic Technology, Fujian Key Laboratory for Advanced Micro-Nano Photonics Technology and Devices & Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Quanzhou 362000, China
2
College of Science, Zhejiang University of Technology, Hangzhou 310023, China
3
College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
4
School of Science, Huzhou University, Huzhou 313000, China
*
Author to whom correspondence should be addressed.
These authors contribute equally to this article.
Micromachines 2020, 11(1), 58; https://doi.org/10.3390/mi11010058
Received: 26 November 2019 / Revised: 13 December 2019 / Accepted: 15 December 2019 / Published: 1 January 2020
The combination of critical coupling and coupled mode theory in this study elevated the absorption performance of a graphene-based absorber in the near-infrared band, achieving perfect absorption in the double bands (98.96% and 98.22%), owing to the guided mode resonance (the coupling of the leak mode and guided mode under the condition of phase matching, which revealed 100% transmission or reflection efficiency in the wavelet band), and a third high-efficiency absorption (91.34%) emerged. During the evaluation of the single-structure, cross-circle-shaped absorber via simulation and theoretical analysis, the cross-circle shaped absorber assumed a conspicuous preponderance through exploring the correlation between absorption and tunable parameters (period, geometric measure, and incident angle of the cross-circle absorber), and by briefly analyzing the quality factors and universal applicability. Hence, the cross-circle resonance structure provides novel potential for the design of a dual-band unpatterned graphene perfect absorber in the near-infrared band, and possesses practical application significance in photoelectric detectors, modulators, optical switching, and numerous other photoelectric devices. View Full-Text
Keywords: graphene; near infrared; critical coupling; dual-band perfect absorption graphene; near infrared; critical coupling; dual-band perfect absorption
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MDPI and ACS Style

Wu, P.; Chen, Z.; Xu, D.; Zhang, C.; Jian, R. A Narrow Dual-Band Monolayer Unpatterned Graphene-Based Perfect Absorber with Critical Coupling in the Near Infrared. Micromachines 2020, 11, 58.

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