Ultrathin dual-band surface plasmonic polariton waveguide and frequency splitter in microwave frequencies
Ultrathin dual-band surface plasmonic polariton waveguide and frequency splitter in microwave frequencies
复制标题
微波频率中的超薄双频带表面等离子体激元波导和分频器
DOI：
10.1063/1.4802739
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发表时间：
2013-04-15
影响因子：
4
通讯作者：
Cui, Tie Jun
中科院分区：
文献类型：
--
作者：
Gao, Xi;Shi, Jin Hui;Cui, Tie Jun
设计了一种基于平面复合周期光栅表面等离子体激元(DSPP)的超薄双频等离子体光波导和分频器。在这种平面等离子体超材料中，电磁波可以被紧密地限制在超薄的金属光栅周围，而DSPP的传输强烈地依赖于由凹槽深度决定的色散关系。基于这种特性，我们设计并制作了一种支持两个DSPP模的超薄复合光栅，在弯曲表面等离子体激元(SPP)波导中表现出较低的弯曲损耗。此外，我们还提出了一种通过调节两个分支的沟槽深度来实现超薄SPP分频的方法。实验结果与数值模拟结果吻合较好。
We present an ultrathin dual-band plasmonic waveguide and frequency splitter experimentally based on designer surface plasmon polaritons (DSPPs) of planar composite periodic gratings. In such planar plasmonic metamaterials, the electromagnetic wave can be tightly confined around an ultrathin metallic grating, and the propagation of DSPPs strongly depends on the dispersion relation determined by the depth of groove. Based on such features, we design and fabricate an ultrathin composite grating to support two DSPP modes, which exhibit low bending loss in the bending surface plasmon polariton (SPP) waveguide. We further propose an ultrathin SPP frequency splitter by adjusting the groove depths of two branches. The experimental results are in good agreement to the numerical simulations.