Synthesizing low loss negative index metamaterial stacks for the mid-infrared using genetic algorithms
Synthesizing low loss negative index metamaterial stacks for the mid-infrared using genetic algorithms
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DOI：
10.1364/oe.17.014771
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发表时间：
2009-08-17
期刊：
影响因子：
3.8
通讯作者：
Mayer, Theresa S.
中科院分区：
文献类型：
--
作者：
Bossard, Jeremy A.;Yun, Seokho;Mayer, Theresa S.
提出了一种具有低吸收和阻抗失配损耗的中红外负折射率超材料设计。一个强大的遗传算法来优化的柔性超材料结构的目标折射率和阻抗值。引入了一种新的品质因数来评估超材料与自由空间的阻抗匹配。两种设计展示了具有两个金属屏幕的薄超材料和具有五个屏幕的厚超材料堆叠的低损耗特性。当向结构中添加更多屏幕时，分析了器件性能，揭示了优化厚堆叠产生的超材料具有接近块状材料的特性。(C)2009年美国光学学会
Negative index metamaterial designs for the mid-infrared with low absorption and impedance mismatch losses are presented. A robust genetic algorithm is employed to optimize the flexible metamaterial structure for targeted refractive index and impedance values. A new figure of merit is introduced to evaluate the impedance match of the metamaterial to free space. Two designs are presented demonstrating low-loss characteristics for a thin metamaterial with two metal screens and a thick metamaterial stack with five screens. The device performance is analyzed when adding more screens to the structure, revealing that optimizing a thick stack produces a metamaterial with properties approaching those of a bulk material. (C) 2009 Optical Society of America