Design of a Far-Infrared Broadband Metamaterial Absorber with High Absorption and Ultra-Broadband

被引：5
作者：
Xu, Tao [1 ]
Yi, Yingting [2 ]
Song, Qianju [1 ]
Yi, Zao [1 ,3 ,4 ]
Yi, Yougen [2 ]
Cheng, Shubo [3 ]
Zhang, Jianguo [5 ]
Tang, Chaojun [6 ]
Sun, Tangyou [7 ]
Zeng, Qingdong [8 ]
机构：
[1] Southwest Univ Sci & Technol, Joint Lab Extreme Condit Matter Properties, State Key Lab Environm Friendly Energy Mat, Minist Educ,Key Lab Mfg Proc Testing Technol, Mianyang 621010, Peoples R China
[2] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China
[3] Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China
[4] Jishou Univ, Sch Chem & Chem Engn, Jishou 416000, Peoples R China
[5] Jinzhong Univ, Dept Phys, Jinzhong 030619, Peoples R China
[6] Zhejiang Univ Technol, Coll Sci, Hangzhou 310023, Peoples R China
[7] Guilin Univ Elect Technol, Guangxi Key Lab Precis Nav Technol & Applicat, Guilin 541004, Peoples R China
[8] Hubei Engn Univ, Sch Phys & Elect Informat Engn, Xiaogan 432000, Peoples R China
来源：
COATINGS | 2024年 / 14卷 / 07期
基金：
中国国家自然科学基金;
关键词：
far infrared; broadband; high absorption; surface plasmon resonance; microstructure; hollow crossed;
D O I：
10.3390/coatings14070799
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We designed a metamaterial far-infrared absorber based on an MDM (metal-dielectric-metal) structure. We made a hollow crossed Ti microstructure at the top of the absorber. It is known that the coupling effect of equipartitional exciton resonance and intrinsic absorption at the surface of the depleting material has a strong influence on the absorber. Based on this, we investigated the absorption characteristics of the absorber using the Finite Difference in Time Domain (FDTD) theory. The results show that the absorber absorbed more than 90% of the light within a bandwidth of 12.01 mu m. The absorber has an average absorption of 94.08% in the longwave infrared (LWIR) to ultra-longwave infrared (UWIR) bands (10.90-22.91 mu m). The polarization insensitivity of the designed absorber is demonstrated by analyzing the absorption spectra of the absorber at different polarization angles. By adjusting the relevant geometric parameters, the absorption spectrum can be independently adjusted. Furthermore, the absorber exhibits good incidence angle insensitivity in both transverse electric (TE) and transverse magnetic (TM) modes. The absorbers are simple and easy to configure for applications such as optical cloaking, infrared heat emitters, and photodetectors. These advantages will greatly benefit the application of absorbers in practice.
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页数：15
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