Steering surface plasmons with a graded index dielectric medium
Steering surface plasmons with a graded index dielectric medium
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DOI：
10.1088/1361-6463/aae3a5
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发表时间：
2018-12-05
影响因子：
3.4
通讯作者：
Beruete, Miguel
中科院分区：
文献类型：
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作者：
Pacheco-Pena, Victor;Beruete, Miguel
几十年来，对表面等离子激元(SP)传播的任意控制已成为一个热门的研究课题。这是因为它们可以用于各种领域，如光学捕获、纳米天线和医疗应用。在这种通信中，渐变折射率技术被应用于几个转向器的设计中，这些转向器能够通过简单地改变半无限金属板上的介质块的高度来定制入射SPS的传播方向。给出了设计过程，并对结构进行了数值计算，结果与解析计算吻合较好，SPS在设计角(10度到60度)处偏转，带宽控制在设计值(633 Nm)附近60 nm。
The arbitrary control of surface plasmon (SP) propagation has become an intense research topic for several decades. This is due to the fact that they can be used in a variety of fields such as optical trapping, nanoantennas and medical applications. In this communication, the graded index technique is applied in the design of several steerers able to tailor the direction of propagation of the incident SPs by simply changing the height of a dielectric block on top of a semi-infinite metal slab. The design procedure is shown and the structures are numerically evaluated demonstrating a good agreement with the analytical calculations, with the SPs deflected at the design angles (theta ranging from 10 degrees to 60 degrees) with a wide bandwidth steering of 60 nm around the design value (633 nm).