Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers
Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers
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谐振器几何形状及其与地平面的耦合对超薄超材料完美吸波器的影响
DOI：
10.1063/1.4749823
复制
发表时间：
2012-09-03
影响因子：
4
通讯作者：
Chen, Hou-Tong
中科院分区：
文献类型：
--
作者：
Huang, Li;Chowdhury, Dibakar Roy;Chen, Hou-Tong
研究了谐振器的几何形状及其与地平面的耦合对超材料理想吸波材料性能的影响。以交叉谐振器为例，我们发现通过改变谐振器的几何尺寸可以进一步减小吸振器的厚度。数值模拟和理论计算表明，近统一吸收是由多次反射的相消干涉引起的。谐振器阵列和地平面之间的近场耦合可能是显著的。当考虑这种耦合时，用干涉模型计算的理论结果与实验和数值模拟符合得很好。
We investigate the impact of resonator geometry and its coupling with ground plane on the performance of metamaterial perfect absorbers. Using a cross-resonator as an example structure, we find that the absorber thickness can be further reduced through modifying the geometric dimensions of the resonators. Numerical simulations and theoretical calculations reveal that destructive interference of multiple reflections is responsible for the near-unity absorption. The near-field coupling between the resonator array and ground plane can be significant. When this coupling is taken into account, the theoretical results calculated using the interference model are in excellent agreement with experiments and numerical simulations.