Design of a multiband terahertz perfect absorber

A thin-flexible multiband terahertz metamaterial absorber （MA） has been investigated. Each unit cell of the MA consists of a simple metal structure, which includes the top metal resonator ring and the bottom metallic ground plane, separated by a thin-flexible dielectric spacer. Finite-difference tim...

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Bibliographic Details
Published inChinese physics B Vol. 25; no. 3; pp. 391 - 397
Main Author 胡丹 王红燕 汤振杰 张希威 鞠琳 王华英
Format Journal Article
LanguageEnglish
Published 01.03.2016
Subjects
Absorption
Assembling
Asymmetry
Detection
Error analysis
Finite difference method
Ground plane
Mathematical analysis
传感灵敏度
吸收体
多波段
太赫兹
时域仿真
理想
设计
金属结构
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Summary:A thin-flexible multiband terahertz metamaterial absorber （MA） has been investigated. Each unit cell of the MA consists of a simple metal structure, which includes the top metal resonator ring and the bottom metallic ground plane, separated by a thin-flexible dielectric spacer. Finite-difference time domain simulation indicates that this MA can achieve over 99% absorption at frequencies of 1.50 THz, 3.33 THz, and 5.40 THz by properly assembling the sandwiched structure. However, because of its asymmetric structure, the MA is polarization-sensitive and can tune the absorptivity of the second absorption peak by changing the incident polarization angle. The effect of the error of the structural parameters on the absorption efficiency is also carefully analyzed in detail to guide the fabrication. Moreover, the proposed MA exhibits high refractive-index sensing sensitivity, which has potential applications in multi-wavelength sensing in the terahertz region.
Bibliography:multiband, terahertz, electromagnetic resonance, metamaterial absorber
A thin-flexible multiband terahertz metamaterial absorber （MA） has been investigated. Each unit cell of the MA consists of a simple metal structure, which includes the top metal resonator ring and the bottom metallic ground plane, separated by a thin-flexible dielectric spacer. Finite-difference time domain simulation indicates that this MA can achieve over 99% absorption at frequencies of 1.50 THz, 3.33 THz, and 5.40 THz by properly assembling the sandwiched structure. However, because of its asymmetric structure, the MA is polarization-sensitive and can tune the absorptivity of the second absorption peak by changing the incident polarization angle. The effect of the error of the structural parameters on the absorption efficiency is also carefully analyzed in detail to guide the fabrication. Moreover, the proposed MA exhibits high refractive-index sensing sensitivity, which has potential applications in multi-wavelength sensing in the terahertz region.
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/3/037801