DUAL-BAND TERAHERTZ METAMATERIAL ABSORBER WITH POLARIZATION INSENSITIVITY AND WIDE INCIDENT ANGLE
DUAL-BAND TERAHERTZ METAMATERIAL ABSORBER WITH POLARIZATION INSENSITIVITY AND WIDE INCIDENT ANGLE
复制标题
具有偏振不敏感和宽入射角的双波段太赫兹超材料吸收器
DOI：
10.2528/pier11022307
复制
发表时间：
2011-01-01
影响因子：
6.7
通讯作者：
Wu, Q.
中科院分区：
文献类型：
--
作者：
He, X. -J.;Wang, Y.;Wu, Q.
本文介绍了一种偏振不敏感、宽入射角的双频太赫兹超材料吸收器的设计、仿真和测量。超材料的单元胞由顶部谐振腔结构和低金属接平面组成，由隔离材料间隔层隔开，实现电和磁共振。基于时域有限差分计算方法，分别模拟了x分量和法向分量电场分布、ERRs和金属接平面上的电流分布、共振频率和不同模式电磁波下的功率流和损耗分布，从理论上研究了双波段吸收的物理机制以及对电磁波偏振方向和入射方向的灵敏度。结果表明，该吸收器不仅能正确耦合入射电场和磁场，而且能将输入功率捕获到器件的特定位置并吸收，对极化角和入射角不敏感。实验表明，该吸波器在1.724 THz和3.557 THz附近具有82.8%和86.8%的强吸收率。
This paper presents the design, simulation and measurement of a dual-band terahertz metamaterial absorber with polarization-insensitivity and wide incident angle. The unit cell of the metamaterial consists of top resonator structures and low metallic ground plane, separated by an isolation material spacer to realize both electric and magnetic resonances. The physical mechanism of dual-band absorption and the sensitivity to the polarization direction and incident direction of the EM wave are theoretically investigated by simulating the x-component and normal component electric field distribution, current distribution on ERRs and metallic ground plane, and distribution of power flow and loss at the resonance frequencies as well as different modes EM waves, based the FDTD calculated method, respectively. The results show that the absorber is not only correctly coupling to the incident electric field and magnetic field, but also can trap the input power into specific positions of the devices and absorb it, besides insensitivity to the polarized angle and incident angle. Moreover, the experiment demonstrates that the absorber achieves two strong absorptions of 82.8% and 86.8% near 1.724 and 3.557 THz.