A WIDE-BAND, POLARIZATION-INSENSITIVE AND WIDE-ANGLE TERAHERTZ METAMATERIAL ABSORBER
A WIDE-BAND, POLARIZATION-INSENSITIVE AND WIDE-ANGLE TERAHERTZ METAMATERIAL ABSORBER
复制标题
宽带、偏振不敏感、广角太赫兹超材料吸收器
DOI：
10.2528/pierl10070105
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发表时间：
2010-01-01
影响因子：
0.9
通讯作者：
Peng, W.
中科院分区：
文献类型：
--
作者：
Gu, C.;Qu, S.;Peng, W.
本文提出了一种宽频带、偏振不敏感、广角太赫兹超材料吸收体。仿真结果表明，该吸波器在4.15 ~ 4.85 THz范围内可以实现偏振不敏感的广角吸收。反演的阻抗表明，吸收器的阻抗可以在吸收波段内进行调谐，使其与一侧的自由空间阻抗近似匹配，而与另一侧的自由空间阻抗不匹配，从而使反射率和透射率都最小，从而使相应的吸光度最大。三种不同损耗条件下的吸光度模拟表明，高吸光度主要是由金属吸收（欧姆损耗）引起的。与金属吸收相比，衬底的介电损耗较小。表面电流密度的分布表明，电磁响应主要是由前端结构引起的。这种宽带太赫兹超材料吸收体在许多功能器件中有潜在的应用，如微辐射热计、热探测器和太阳能电池。
In this paper, a wide-band, polarization-insensitive, wide-angle terahertz metamaterial absorber is presented. Simulated results show that the absorber can achieve polarization -insensitive, wide-angle absorptions in a wide band from 4.15 to 4.85 THz. The retrieved impedance shows that the impedance of the absorber could be tuned, in the absorption band, to match approximatively that of free space on one side and to mismatch on the other side, rendering both the reflectance and transmission minimal and thus the corresponding absorbance maximal. The simulated absorbances under three different loss conditions suggest that high absorbance is mainly due to the metallic absorption (Ohmic loss). The dielectric loss of the substrate is minor compared with the metallic absorption. The distribution of the surface current density indicates that the electric and magnetic responses are mainly caused by the front structure. This wide-band terahertz metamaterial absorber has potential applications in many functional devices such as microbolometers, thermal detectors, and solar cells.