Multiband guided-mode resonance filter in bilayer asymmetric metallic gratings
Multiband guided-mode resonance filter in bilayer asymmetric metallic gratings
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DOI：
10.1016/j.optlastec.2018.01.017
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发表时间：
2018-07
影响因子：
5
通讯作者：
Yanhui Wang;Xiangjun Li;T. Lang;Xufeng Jing;Zhi Hong
中科院分区：
文献类型：
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作者：
Yanhui Wang;Xiangjun Li;T. Lang;Xufeng Jing;Zhi Hong
提出了一种基于导模共振（GMRs）的双层非对称金属光栅多带滤波器。在1.4 ~ 2.0 太赫兹的频率范围内，由于结构对称性的破坏，两种GMR模式（te0和TM0）发生了分裂，从而产生了四个急剧的下降。这种结构的对称性取决于上层和下层光栅之间的相对位置。因此，通过选择合适的侧向位移，可以消除te0或/和tm0模式的分裂。对基于二、三、四GMRs的极化不敏感或敏感滤波器进行了数值演示。
In this paper, a guided-mode resonances (GMRs) based multiband filter in bilayer asymmetric metallic gratings is presented. Four sharp dips are generated in the frequency range of 1.4–2.0 THz, which are induced by the split of two GMR modes (TE0and TM0) due to the break of the structure’s symmetry. This symmetry of the structure depends on the relative position between the upper layer and lower layer gratings. Therefore, by choosing proper lateral displacement, the split of TE0or/and TM0modes can be eliminated. Two-, three-, and four- GMRs based polarization insensitive or sensitive filters are demonstrated numerically.