Broadband Terahertz Metamaterial Absorber Based on Double Composite Structure Layers

被引：0
|
作者：
Bai J. [1 ]
Ge M. [1 ]
Xing H. [1 ]
Sun X. [1 ]
Zhao J. [1 ]
Chang S. [2 ]
机构：
[1] Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin
[2] Institute of Modern Optics, Nankai University, Tianjin
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2019年 / 46卷 / 06期
关键词：
Broadband absorber; Composite structure; Finite difference time domain; Materials; Metamaterials; Terahertz;
D O I：
10.3788/CJL201946.0614034
中图分类号：
学科分类号：
摘要：
A broadband terahertz metamaterial absorber is proposed based on the double composite structure layers (CSLs). The composite structure layer I and composite structure layer II comprise four different-sized gold rings and square plates, respectively. Further, the finite difference time domain (FDTD) method is employed to theoretically investigate and discuss the effects of absorption spectrum, magnetic field distribution, surface current distribution, polarization angle, and incident angle on absorption. The results show that the high-order resonance peaks can be effectively suppressed by this absorber. Furthermore, in case of normal incidence, the absorption bandwidth corresponding to absorptivity greater than 90% is 0.722 THz, and its central frequency is approximately 2.041 THz. © 2019, Chinese Lasers Press. All right reserved.
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