Ultra-broadband terahertz metamaterial absorber
Ultra-broadband terahertz metamaterial absorber
复制标题
超宽带太赫兹超材料吸收体
DOI：
10.1063/1.4890521
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发表时间：
2014-07-14
影响因子：
4
通讯作者：
Ma, Yungui
中科院分区：
文献类型：
--
作者：
Zhu, Jianfei;Ma, Zhaofeng;Ma, Yungui
我们展示了一种超宽带、偏振不敏感、宽角度的太赫兹(THz)超材料吸波材料，采用金属-介质多层复合材料组成的截断金字塔单元阵列。在我们的设计中，作为有效波导的每个子层在其横向宽度上被逐渐修改，通过有效地将不同波导模式的谐振带缝合在一起来实现宽带响应。实验上，我们的总厚度为21 μm的五层样品在最大测量角度40°时，在0.7~2.3 太赫兹范围内能够产生大于80%的大吸收率。我们的器件在半高处的全吸收宽度约为127%，比以前报道的太赫兹频率的吸收宽度大。我们的吸收体设计具有很高的实用可行性，可以很容易地与半导体技术相结合，制造出高效的太赫兹取向器件。
We demonstrated an ultra-broadband, polarization-insensitive, and wide-angle metamaterial absorber for terahertz (THz) frequencies using arrays of truncated pyramid unit structure made of metal-dielectric multilayer composite. In our design, each sub-layer behaving as an effective waveguide is gradually modified in their lateral width to realize a wideband response by effectively stitching together the resonance bands of different waveguide modes. Experimentally, our five layer sample with a total thickness 21 μm is capable of producing a large absorptivity above 80% from 0.7 to 2.3 THz up to the maximum measurement angle 40°. The full absorption width at half maximum of our device is around 127%, greater than those previously reported for THz frequencies. Our absorber design has high practical feasibility and can be easily integrated with the semiconductor technology to make high efficient THz-oriented devices.