A metamaterial absorber for the terahertz regime: Design, fabrication and characterization
A metamaterial absorber for the terahertz regime: Design, fabrication and characterization
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DOI：
10.1364/oe.16.007181
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发表时间：
2008-05-12
期刊：
影响因子：
3.8
通讯作者：
Padilla, Willie J.
中科院分区：
文献类型：
--
作者：
Tao, Hu;Landy, Nathan I.;Padilla, Willie J.
我们展示了一种在太赫兹频率下作为强共振吸收体的超材料。我们的设计包含一个双层单元结构，它能够通过对介电常数和磁导率的独立调节来实现吸收的最大化。在1.3太赫兹下，实验吸收率达到70%。我们在传播方向上仅使用单个单元结构，从而实现了吸收系数α = 2000 cm⁻¹。由于这些超材料体积相对较小、密度较低且具有窄带响应，它们是基于热的太赫兹成像中吸收元件的有希望的候选材料。（C）2008美国光学学会
We present a metamaterial that acts as a strongly resonant absorber at terahertz frequencies. Our design consists of a bilayer unit cell which allows for maximization of the absorption through independent tuning of the electrical permittivity and magnetic permeability. An experimental absorptivity of 70% at 1.3 terahertz is demonstrated. We utilize only a single unit cell in the propagation direction, thus achieving an absorption coefficient alpha = 2000 cm(-1). These metamaterials are promising candidates as absorbing elements for thermally based THz imaging, due to their relatively low volume, low density, and narrow band response. (C) 2008 Optical Society of America.