Ultra-broadband terahertz metamaterial absorber

被引:382
作者
Zhu, Jianfei [1 ]
Ma, Zhaofeng [1 ]
Sun, Wujiong [2 ,3 ,4 ]
Ding, Fei [1 ]
He, Qiong [2 ,3 ,4 ]
Zhou, Lei [2 ,3 ,4 ]
Ma, Yungui [1 ]
机构
[1] Zhejiang Univ, Dept Opt Engn, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, Hangzhou 310058, Zhejiang, Peoples R China
[2] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[3] Fudan Univ, Key Lab Micro & Nano Photon Struct, Minist Educ, Shanghai 200433, Peoples R China
[4] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
基金
中国博士后科学基金;
关键词
REGIME; REFRACTION; SENSOR;
D O I
10.1063/1.4890521
中图分类号
O59 [应用物理学];
学科分类号
摘要
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 mu m is capable of producing a large absorptivity above 80% from 0.7 to 2.3 THz up to the maximum measurement angle 40 degrees. 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. (C) 2014 AIP Publishing LLC.
引用
收藏
页数:4
相关论文
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