Compact Antenna for Efficient and Unidirectional Launching and Decoupling of Surface Plasmons
Compact Antenna for Efficient and Unidirectional Launching and Decoupling of Surface Plasmons
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DOI：
10.1021/nl202135w
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发表时间：
2011-10-01
期刊：
影响因子：
10.8
通讯作者：
Lalanne, Philippe
中科院分区：
文献类型：
--
作者：
Baron, Alexandre;Devaux, Eloise;Lalanne, Philippe
控制表面等离子体激元（SPP）的发射效率和方向性以及它们与自由传播光的解耦是等离子体激元器件和系统开发的主要目标。在这里，我们报告的设计和实验观察的一个高效的单向表面等离子体发射器组成的11个亚波长槽，每个具有不同的深度和宽度。我们的观察表明，在正常照明下，由一个聚焦的高斯光束，单向SPP发射效率至少为52%的实验实现与紧凑的设备的总长度小于8 μ m。反过来，我们报告说，相同的设备可以有效地将SPP转换成一个高度定向的光束发出垂直于样品。
Controlling the launching efficiencies and the directionality of surface plasmon polaritons (SPPs) and their decoupling to freely propagating light is a major goal for the development of plasmonic devices and systems. Here, we report on the design and experimental observation of a highly efficient unidirectional surface plasmon launcher composed of eleven subwavelength grooves, each with a distinct depth and width. Our observations show that, under normal illumination by a focused Gaussian beam, unidirectional SPP launching with an efficiency of at least 52% is achieved experimentally with a compact device of total length smaller than 8 mu m. Reciprocally, we report that the same device can efficiently convert SPPs into a highly directive light beam emanating perpendicularly to the sample.