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

被引：61
作者：
Wu, Pinghui [1 ,2 ]
Chen, Zeqiang [1 ,2 ]
Xu, Danyang [3 ]
Zhang, Congfen [4 ]
Jian, Ronghua [5 ]
机构：
[1] Quanzhou Normal Univ, Res Ctr Photon Technol, Fujian Key Lab Adv Micronano Photon Technol & Dev, Quanzhou 362000, Peoples R China
[2] Quanzhou Normal Univ, Key Lab Informat Funct Mat Fujian Higher Educ, Quanzhou 362000, Peoples R China
[3] Zhejiang Univ Technol, Coll Sci, Hangzhou 310023, Peoples R China
[4] Southwest Univ Sci & Technol, Coll Life Sci & Engn, Mianyang 621010, Sichuan, Peoples R China
[5] Huzhou Univ, Sch Sci, Huzhou 313000, Peoples R China
来源：
MICROMACHINES | 2020年 / 11卷 / 01期
基金：
中国国家自然科学基金;
关键词：
graphene; near infrared; critical coupling; dual-band perfect absorption; TOTAL ABSORPTION; LAYER;
D O I：
10.3390/mi11010058
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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.
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页数：13
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